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{{Short description|Star in the constellation Microscopium}}
{{Short description|Star in the constellation Microscopium}}
{{Starbox begin}}
{{Starbox begin
| name = [[Flamsteed designation|3 Piscis Austrini]]
⚫
}}
{{Starbox observe
{{Starbox observe
| epoch = [[J2000.0]]
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Microscopium]]
| constell = [[Microscopium]]
| ra = {{RA|12|11|17.33721}}<ref name=GaiaDR2/>
| ra = {{RA|21|13|17.32730}}<ref name = GaiaDR3/>
| dec = {{DEC|−23|36|09.6123}}<ref name=GaiaDR2/>
| dec = {{DEC|−27|37|09.7106}}<ref name = GaiaDR3/>
| appmag_v = 5.41<ref name=Anderson2012/>
| appmag_v = 5.39{{±|0.01}}<ref name = Tycho2000/>
}}
}}
{{Starbox character
{{Starbox character
| class = K3 III<ref name = Houk1982/>
| type = giant
| class = K3&nbsp;III<ref name=houk1979/>
| b-v = +1.42<ref name = Johnson1966/>
⚫
| b-v = {{Val|1.425|0.006}}<ref name=Anderson2012/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = {{Val|−46.2|2.4}}<ref name=Anderson2012/>
| radial_v = −46.2{{±|2.4}}<ref name = Gontcharov2006/>
| prop_mo_ra = +90.349<ref name=GaiaDR2/>
| prop_mo_ra = +98.513
| prop_mo_dec = −117.051<ref name=GaiaDR2/>
| prop_mo_dec = −110.906
⚫
| pm_footnote = <ref name = GaiaDR3/>
| parallax = 10.6862
| p_error = 0.3860
| parallax = 8.0734
| p_error = 0.1733
⚫
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v = 0.19<ref name=Anderson2012/>
| parallax_footnote = <ref name = GaiaDR3/>
⚫
| absmag_v = +0.19<ref name=Anderson2012/>
}}
}}
{{Starbox detail
{{Starbox detail
| mass = 1.58<ref name = Anders2019/>
| source =
| radius = 31.3{{±|1.6}}<ref name = Kervella2004/>
| mass =
| radius = 20<ref name=lang2006/>
| luminosity = 184{{±|9|8}}<ref name = GaiaDR3/>
| gravity = 1.86<ref name=McWilliam1990/>
| gravity = 1.86<ref name=McWilliam1990/>
| luminosity = 173.80<ref name=Anderson2012/>
| temperature = 4,225{{±|123}}<ref name = Stassun2019/>
| temperature = 4,050<ref name=McWilliam1990/>
| metal_fe = −0.17<ref name=McWilliam1990/>
| metal_fe = −0.17<ref name=McWilliam1990/>
| rotational_velocity =
| rotational_velocity = <1<ref name = "De Medeiros2014"/>
| age_gyr = 2.59{{±|0.83|1.90}}<ref name = GaiaDR3/>
| age_myr =
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = {{odlist | F=3 PsA | CD=−28°17178 | FK5=1556 | HD=201901 | HIP=104750 | HR=8110 | SAO=190129 }}<ref name=SIMBAD/>
| names = {{odlist | F=3 PsA | Gould=58 G. Microscopii | CD=−28°17178 | CPD=−28°7411 | GC=29652 | FK5=1556 | HD=201901 | HIP=104750 | HR=8110 | SAO=190129}}<ref name=SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
Line 41: Line 42:
{{Starbox end}}
{{Starbox end}}


'''3 Piscis Austrini''', also known as '''HD 201901''', is a suspected [[astrometric binary]]<ref name=Eggleton2008/> [[star]] system that, despite its [[Flamsteed designation]], is actually located in the [[constellation]] [[Microscopium (constellation)|Microscopium]]. It is visible to the naked eye as a faint, orange-hued star with an [[apparent visual magnitude]] of 5.41.<ref name=SIMBAD/> The system is moving closer to the Earth with a heliocentric [[radial velocity]] of −46&nbsp;km/s.<ref name=Anderson2012/> It is following a highly elliptical orbit around the [[Galactic Center]], moving between a pericenter of {{Val|2.6|ul=kpc}} out to an apocenter of {{Val|7.6|u=kpc}}, with an [[orbital eccentricity]] of 0.49.<ref name=Anderson2012/>
'''3 Piscis Austrini''', also known as '''HD 201901''' or simply '''3 PsA''', is an [[astrometric binary]]<ref name = Eggleton2008/> (100% chance<ref name = Frankowski2006/>) located in the southern [[constellation]] [[Microscopium]]. It was once part of [[Piscis Austrinus]], the southern fish. The system has a combined [[apparent magnitude]] of 5.39,<ref name = Tycho2000/> making it faintly visible to the [[naked eye]] under ideal conditions. [[Gaia DR3]] [[parallax]] measurements imply a distance of 404 [[light years]]<ref name = GaiaDR3/> and it is currently approaching the [[Solar System]] with a heliocentric [[radial velocity]] of {{val|−46.2|ul=km/s}}.<ref name = Gontcharov2006/> At its current distance, 3 PsA's brightness is diminished by 0.12 [[magnitude (astronomy)|magnitude]]s due to [[extinction (astronomy)|extinction]] from [[interstellar dust]]<ref name = Gontcharov2017/> and it has an [[absolute magnitude]] of +0.19.<ref name=Anderson2012/>


The visible component is an [[stellar evolution|evolved]] [[giant star]] with a [[stellar classification]] of K3&nbsp;III.<ref name=houk1979/> The [[interferometry]]-measured [[angular diameter]] of the star, after correcting for [[limb darkening]], is {{Val|2.03|0.04|ul=mas}},<ref name=Richichi2005/> which, at its estimated distance, equates to a physical radius of about 20 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> It is radiating 174<ref name=Anderson2012/> times the [[luminosity of the Sun]] from its enlarged [[photosphere]] at an [[effective temperature]] of 4,050&nbsp;K.<ref name=McWilliam1990/>
The visible component is an [[stellar evolution|evolved]] [[red giant]] with a [[stellar classification]] of K3 III.<ref name = Houk1982/> The [[interferometry]]-measured [[angular diameter]] of the star, after correcting for [[limb darkening]], is {{Val|2.03|0.04|ul=mas}},<ref name=Richichi2005/> which, at its estimated distance, equates to a physical radius of about 20 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> However, its actual empirical [[radius]] is {{solar radius|31.3|link=y}}.<ref name = Kervella2004/> It has 1.58 times the [[mass of the Sun]]<ref name = Anders2019/> and is radiating 184 times the [[luminosity of the Sun]]<ref name = GaiaDR3/> from its enlarged [[photosphere]] at an [[effective temperature]] of {{val|4225|ul=K|fmt=commas}}.<ref name = Stassun2019/> 3 PsA is metal deficent with an [[iron]] abundance 68% that of the [[Sun]] ([Fe/H] = −0.17)<ref name=McWilliam1990/> and it spins too slowly for its [[projected rotational velocity]] to be measured accurately.<ref name = "De Medeiros2014"/> It is estimated to be 2.59 [[billion years]] old based on [[Gaia DR3]] models.<ref name = GaiaDR3/>


==References==
==References==
{{reflist|refs=
{{reflist|refs=


<ref name=GaiaDR2>{{cite DR2|6790606529228148352}}</ref>
<ref name = GaiaDR3>{{Cite DR3|6790606529228148352}}</ref>


<ref name=SIMBAD>{{cite simbad | title=HD 201901 | access-date=2019-04-11 }}</ref>
<ref name=SIMBAD>{{cite simbad | title=HD 201901 | access-date=2019-04-11 }}</ref>


<ref name = Johnson1966>{{cite journal | last1 = Johnson | first1 = H. L. | last2 = Mitchell | first2 = R. I. | last3 = Iriarte | first3 = B. | last4 = Wisniewski | first4 = W. Z. | title = UBVRIJKL Photometry of the Bright Stars | journal = Communications of the Lunar and Planetary Laboratory | year = 1966 | volume = 4 | pages = 99–110 | bibcode = 1966CoLPL...4...99J}}</ref>
<ref name=houk1979>{{citation
| last1=Houk | first1=Nancy
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| volume=3 | date=1979
| publication-place=Ann Arbor, Michigan
| publisher=Dept. of Astronomy, University of Michigan
| bibcode=1982mcts.book.....H | postscript=.}}</ref>


<ref name = Tycho2000>{{cite journal | last1 = Høg | first1 = E. | last2 = Fabricius | first2 = C. | last3 = Makarov | first3 = V. V. | last4 = Urban | first4 = S. | last5 = Corbin | first5 = T. | last6 = Wycoff | first6 = G. | last7 = Bastian | first7 = U. | last8 = Schwekendiek | first8 = P. | last9 = Wicenec | first9 = A. | title = The Tycho-2 catalogue of the 2.5 million brightest stars | journal = Astronomy and Astrophysics | date = March 2000 | volume = 355 | pages = L27–L30 | s2cid = 17128864 | bibcode = 2000A&A...355L..27H | issn = 0004-6361}}</ref>
<ref name=Eggleton2008>{{citation

| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
<ref name = Gontcharov2006>{{cite journal | last1 = Gontcharov | first1 = G. A. | title = Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system | journal = Astronomy Letters | date = November 2006 | volume = 32 | issue = 11 | pages = 759–771 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773706110065 | pmid = | bibcode = 2006AstL...32..759G | arxiv = 1606.08053 | s2cid = 119231169}}</ref>
| title=A catalogue of multiplicity among bright stellar systems
| journal=[[Monthly Notices of the Royal Astronomical Society]]
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878
| doi=10.1111/j.1365-2966.2008.13596.x | s2cid=14878976 | postscript=. }}</ref>


<ref name=Richichi2005>{{citation
<ref name=Richichi2005>{{citation
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\end{align}</math></ref>
\end{align}</math></ref>


<ref name = Anders2019>{{cite journal | display-authors = 1 | last1 = Anders | first1 = F. | last2 = Khalatyan | first2 = A. | last3 = Chiappini | first3 = C. | last4 = Queiroz | first4 = A. B. | last5 = Santiago | first5 = B. X. | last6 = Jordi | first6 = C. | last7 = Girardi | first7 = L. | last8 = Brown | first8 = A. G. A. | last9 = Matijevič | first9 = G. | last10 = Monari | first10 = G. | last11 = Cantat-Gaudin | first11 = T. | last12 = Weiler | first12 = M. | last13 = Khan | first13 = S. | last14 = Miglio | first14 = A. | last15 = Carrillo | first15 = I. | last16 = Romero-Gómez | first16 = M. | last17 = Minchev | first17 = I. | last18 = de Jong | first18 = R. S. | last19 = Antoja | first19 = T. | last20 = Ramos | first20 = P. | last21 = Steinmetz | first21 = M. | last22 = Enke | first22 = H. | title = Photo-astrometric distances, extinctions, and astrophysical parameters for ''Gaia'' DR2 stars brighter than ''G'' = 18 | journal = Astronomy & Astrophysics | date = August 2019 | volume = 628 | page = A94 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/201935765 | bibcode = 2019A&A...628A..94A | arxiv = 1904.11302 | s2cid = 131780028 | doi-access = free}}</ref>
<ref name=McWilliam1990>{{citation
| last1=McWilliam | first1=Andrew
| title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances
| journal=Astrophysical Journal Supplement Series
| volume=74 | pages=1075–1128 | date=December 1990
| doi=10.1086/191527 | bibcode=1990ApJS...74.1075M }}</ref>


<ref name = McWilliam1990>{{cite journal | last1 = McWilliam | first1 = Andrew | title = High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal = The Astrophysical Journal Supplement Series | date = December 1990 | volume = 74 | page = 1075 | issn = 0067-0049 | eissn = 1538-4365 | doi = 10.1086/191527 | bibcode = 1990ApJS...74.1075M | doi-access = free}}</ref>
<ref name=Anderson2012>{{citation
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref>


<ref name = Anderson2012>{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644}}</ref>
⚫
}}


<ref name = Houk1982>{{cite book | last1 = Houk | first1=N. | title = Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26° | date = 1982 | bibcode = 1982mcts.book.....H }}</ref>

<ref name = Kervella2004>{{cite journal | last1 = Kervella | first1 = P. | last2 = Thévenin | first2 = F. | last3 = Di Folco | first3 = E. | last4 = Ségransan | first4 = D. | title = The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry | journal = Astronomy & Astrophysics | date = October 2004 | volume = 426 | issue = 1 | pages = 297–307 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:20035930 | bibcode = 2004A&A...426..297K | arxiv = astro-ph/0404180 | s2cid = 6077801 | doi-access = free}}</ref>

<ref name = Stassun2019>{{cite journal | display-authors = 1 | last1 = Stassun | first1 = Keivan G. | last2 = Oelkers | first2 = Ryan J. | last3 = Paegert | first3 = Martin | last4 = Torres | first4 = Guillermo | last5 = Pepper | first5 = Joshua | last6 = Lee | first6 = Nathan De | last7 = Collins | first7 = Kevin | last8 = Latham | first8 = David W. | last9 = Muirhead | first9 = Philip S. | last10 = Chittidi | first10 = Jay | last11 = Rojas-Ayala | first11 = Bárbara | last12 = Fleming | first12 = Scott W. | last13 = Rose | first13 = Mark E. | last14 = Tenenbaum | first14 = Peter | last15 = Ting | first15 = Eric B. | last16 = Kane | first16 = Stephen R. | last17 = Barclay | first17 = Thomas | last18 = Bean | first18 = Jacob L. | last19 = Brassuer | first19 = C. E. | last20 = Charbonneau | first20 = David | last21 = Ge | first21 = Jian | last22 = Lissauer | first22 = Jack J. | last23 = Mann | first23 = Andrew W. | last24 = McLean | first24 = Brian | last25 = Mullally | first25 = Susan | last26 = Narita | first26 = Norio | last27 = Plavchan | first27 = Peter | last28 = Ricker | first28 = George R. | last29 = Sasselov | first29 = Dimitar | last30 = Seager | first30 = S. | last31 = Sharma | first31 = Sanjib | last32 = Shiao | first32 = Bernie | last33 = Sozzetti | first33 = Alessandro | last34 = Stello | first34 = Dennis | last35 = Vanderspek | first35 = Roland | last36 = Wallace | first36 = Geoff | last37 = Winn | first37 = Joshua N. | title = The Revised ''TESS'' Input Catalog and Candidate Target List | journal = The Astronomical Journal | date = 9 September 2019 | volume = 158 | issue = 4 | page = 138 | eissn = 1538-3881 | doi = 10.3847/1538-3881/ab3467 | bibcode = 2019AJ....158..138S | arxiv = 1905.10694 | s2cid = 166227927 | hdl = 1721.1/124721 | hdl-access = free | doi-access = free}}</ref>

<ref name = "De Medeiros2014">{{cite journal | last1 = De Medeiros | first1 = J. R. | last2 = Alves | first2 = S. | last3 = Udry | first3 = S. | last4 = Andersen | first4 = J. | last5 = Nordström | first5 = B. | last6 = Mayor | first6 = M. | title = A catalog of rotational and radial velocities for evolved stars V: Southern stars * | journal = Astronomy & Astrophysics | date = January 2014 | volume = 561 | page = A126 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/201220762 | bibcode = 2014A&A...561A.126D | arxiv = 1312.3474 | doi-access = free | s2cid = 54046583}}</ref>

<ref name = Gontcharov2017>{{cite journal | last1 = Gontcharov | first1 = George A. | last2 = Mosenkov | first2 = Aleksandr V. | title = Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars | journal = Monthly Notices of the Royal Astronomical Society | date = 28 September 2017 | volume = 472 | issue = 4 | pages = 3805–3820 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1093/mnras/stx2219 | bibcode = 2017MNRAS.472.3805G | arxiv = 1709.01160 | s2cid = 118879856 | doi-access = free}}</ref>

<ref name = Eggleton2008>{{cite journal | last1 = Eggleton | first1 = P. P. | last2 = Tokovinin | first2 = A. A. | title = A catalogue of multiplicity among bright stellar systems | journal = Monthly Notices of the Royal Astronomical Society | date = 11 September 2008 | volume = 389 | issue = 2 | pages = 869–879 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1111/j.1365-2966.2008.13596.x | bibcode = 2008MNRAS.389..869E | arxiv = 0806.2878 | s2cid = 14878976 | doi-access = free }}</ref>

<ref name = Frankowski2006>{{cite journal | last1 = Frankowski | first1 = A. | last2 = Jancart | first2 = S. | last3 = Jorissen | first3 = A. | title = Proper-motion binaries in the Hipparcos catalogue: Comparison with radial velocity data | journal = Astronomy & Astrophysics | date = 19 December 2006 | volume = 464 | issue = 1 | pages = 377–392 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:20065526 | bibcode = 2007A&A...464..377F | arxiv = astro-ph/0612449 | s2cid = 14010423 | doi-access = free}}</ref>

}}
{{Stars of Microscopium}}
{{Stars of Microscopium}}


Revision as of 18:24, 17 May 2023

3 Piscis Austrini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 21h 13m 17.32730s[1]
Declination −27° 37′ 09.7106″[1]
Apparent magnitude (V) 5.39±0.01[2]
Characteristics
Spectral type K3 III[3]
B−V color index +1.42[4]
Astrometry
Radial velocity (Rv)−46.2±2.4[5] km/s
Proper motion (μ) RA: +98.513 mas/yr[1]
Dec.: −110.906 mas/yr[1]
Parallax (π)8.0734 ± 0.1733 mas[1]
Distance404 ± 9 ly
(124 ± 3 pc)
Absolute magnitude (MV)+0.19[6]
Details
Mass1.58[7] M☉
Radius31.3±1.6[8] R☉
Luminosity184+9
−8[1] L☉
Surface gravity (log g)1.86[9] cgs
Temperature4,225±123[10] K
Metallicity [Fe/H]−0.17[9] dex
Rotational velocity (v sin i)<1[11] km/s
Age2.59+0.83
−1.90[1] Gyr
Other designations
3 PsA, 58 G. Microscopii, CD−28°17178, CPD−28°7411, FK5 1556, GC 29652, HD 201901, HIP 104750, HR 8110, SAO 190129[12]
Database references
SIMBADdata

3 Piscis Austrini, also known as HD 201901 or simply 3 PsA, is an astrometric binary[13] (100% chance[14]) located in the southern constellation Microscopium. It was once part of Piscis Austrinus, the southern fish. The system has a combined apparent magnitude of 5.39,[2] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 404 light years[1] and it is currently approaching the Solar System with a heliocentric radial velocity of −46.2 km/s.[5] At its current distance, 3 PsA's brightness is diminished by 0.12 magnitudes due to extinction from interstellar dust[15] and it has an absolute magnitude of +0.19.[6]

The visible component is an evolved red giant with a stellar classification of K3 III.[3] The interferometry-measured angular diameter of the star, after correcting for limb darkening, is 2.03±0.04 mas,[16] which, at its estimated distance, equates to a physical radius of about 20 times the radius of the Sun.[17] However, its actual empirical radius is 31.3 R☉.[8] It has 1.58 times the mass of the Sun[7] and is radiating 184 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,225 K.[10] 3 PsA is metal deficent with an iron abundance 68% that of the Sun ([Fe/H] = −0.17)[9] and it spins too slowly for its projected rotational velocity to be measured accurately.[11] It is estimated to be 2.59 billion years old based on Gaia DR3 models.[1]

References

  1. ^ a b c d e f g h i Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
  3. ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  4. ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  6. ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  7. ^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
  8. ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
  9. ^ a b c McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". The Astrophysical Journal Supplement Series. 74: 1075. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527. eISSN 1538-4365. ISSN 0067-0049.
  10. ^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
  11. ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361. S2CID 54046583.
  12. ^ "HD 201901". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-11.
  13. ^ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
  14. ^ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue: Comparison with radial velocity data". Astronomy & Astrophysics. 464 (1): 377–392. arXiv:astro-ph/0612449. Bibcode:2007A&A...464..377F. doi:10.1051/0004-6361:20065526. eISSN 1432-0746. ISSN 0004-6361. S2CID 14010423.
  15. ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
  16. ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
  17. ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
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