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{{Short description|High proper motion star in the constellation Equuleus}}
{{Short description|High proper motion star in the constellation Equuleus}}
{{Starbox begin
{{Starbox begin
|name = HD 201507
| name = [[Henry Draper Catalogue|HD]] 201507
}}
}}
{{Starbox observe
{{Starbox observe
|epoch = J2000
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
|ra = {{RA|21|09|58.26}}<ref name = GaiaDR2/>
| ra = {{RA|21|09|58.2645}}<ref name = GaiaDR2/>
|dec = {{DEC|02|56|37.0}}<ref name = GaiaDR2/>
| dec = {{DEC|+02|56|37.3096}}<ref name = GaiaDR2/>
|appmag_v = {{val|6.43|0.01}}<ref name = Tycho/>
| appmag_v = 6.43{{±|0.01}}<ref name = Tycho/>
|constell = [[Equuleus]]
| constell = [[Equuleus]]
}}
}}
{{Starbox character
{{Starbox character
|class = F2V<ref name = Houk1999/>
| class = F5 IV<ref name = Harlan1974/>
|b-v = {{val|0.38|0.01}}<ref name = XHIP/>
| b-v = +0.37<ref name = Cousins1971/>
|u-b =
| u-b = +0.06<ref name = Cousins1971/>
|variable =
}}
}}
{{Starbox astrometry
{{Starbox astrometry
|radial_v = {{val|-44|2}}<ref name = Wilson1953/>
| radial_v = −42.8{{±|2.4}}<ref name = Gontcharov2006/>
|prop_mo_ra = +48.902
| prop_mo_ra = +48.902
|prop_mo_dec = +10.883
| prop_mo_dec = +10.883
|parallax = 15.2530
| parallax = 15.2530
|parallax_footnote=<ref name = GaiaDR2/>
| parallax_footnote = <ref name = GaiaDR2/>
|absmag_v = 2.12<ref name = XHIP/>
|absmag_v = 2.12<ref name = XHIP/>
|p_error=0.3122|pm_footnote=<ref name = GaiaDR2/>}}
| p_error = 0.3122
| pm_footnote = <ref name = GaiaDR2/>
}}
{{Starbox detail
{{Starbox detail
|mass = 1.35<ref name = David2015/>
| mass = 1.45{{±|0.23}}<ref name = Stassun2019/>
|radius = {{val|2.25|0.09|0.12}}<ref name = GaiaDR2/>
| radius = 2.2{{±|0.1}}<ref name = Stassun2019/>
|luminosity = {{val|9.147|0.21}}<ref name = GaiaDR2/>
| luminosity = {{val|9.147|0.21}}<ref name = GaiaDR2/>
|temperature = {{val|6686|184|131}}<ref name = GaiaDR2/>
| temperature = 6,846{{±|233}}<ref name = David2015/>
|metal_fe = {{val|0.10|0.12|0.13}}<ref name = Teff2006/>
| metal_fe = +0.09<ref name = Netopil2017/>
|gravity =3.831<ref name = Nord2004/>
| gravity = 3.91{{±|0.09}}<ref name = Stassun2019/>
|rotational_velocity=16<ref name = Nord2004/>
| rotational_velocity= 16.4{{±|10.6}}<ref name = DeMederios2014/>
|age_gyr = 1.2<ref name = Nord2004/>
| age_gyr = 1.21<ref name = David2015/>
}}
}}
{{Starbox catalog
{{Starbox catalog
|names = 13 [[Gould designation|G.]] Equulei, [[Durchmusterung|BD]]+02° 4311, [[Hipparcos catalog|HIP]] 104481, [[Bright Star Catalog|HR]] 8095<ref name = SIMBAD/>
|names = {{odlist|HD = 201507|HR = 8095|Gould = 13 G. Equulei<ref name = GouldNEW/>|HIP = 104481|AG = +02°2701|BD = +02°4311|GC = 29582|SAO = 126587}}<ref name = SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
Line 42: Line 43:
{{Starbox end}}
{{Starbox end}}


'''HD 201507 (HR 8095)''' is a [[star]] in the constellation [[Equuleus]]. With an [[apparent magnitude]] of 6.43, it's near the [[naked eye]] visibility. This star is located {{Convert|214|ly|pc}} based on [[parallax]], but is drifting closer with a [[radial velocity]] of -44 km/s.
'''HD 201507''', also known as '''HR 8095''', is a white hued [[star]] located in the equatorial [[constellation]] [[Equuleus]]. It has an [[apparent magnitude]] of 6.43,<ref name = Tycho/> placing it near the limit for [[naked eye]] visibility. [[Parallax]] measurements place the object at a distance of 214 [[light year]]s<ref name = GaiaDR2/> and it is currently drifting closer with a heliocentric [[radial velocity]] of {{val|-43|ul=km/s}}.<ref name = Gontcharov2006/>


There has been disagreements in classifying the star's spectrum. Eugene A. Harlan found a [[spectral classification]] of F5 IV,<ref name = Harlan1974/> indicating that it is a [[F-type star|F-type]] [[subgiant]] that is evolving torwards the [[red giant branch]]. On the other hand, [[Nancy Houk]] and Carrie Swift (1999) found a class of F2 V,<ref name = Houk1999/> indicating that it is an [[F-type main-sequence star]].
== Properties ==

HD 201507 is an [[F-type main-sequence star]] with 1.35 time the [[Sun|Sun's]] mass, and 2.25 times the radius. It radiates at 9 [[solar luminosities]], and has a yellow-white hue, which corresponds to an [[effective temperature]] of 6,686 [[Kelvin|K]]. HD 201507 is metal-rich, with 26% more heavy metals than the Sun. This star has a modest rotational rate at 16 km/s, and is estimated to be 1.2 [[billion years]] old, about 4 times younger than the Sun.
Nevertheless, HD 201507 has 1.45 time [[mass of the Sun]] and a slightly enlarged [[radius]] of {{val|2.2|ul=solar radius}}<ref name = Stassun2019/> due to its evolved state. It shines with a [[luminosity]] of about {{val|9|ul=solar luminosity}}<ref name = GaiaDR2/> from its [[photosphere]] at an [[effective temperature]] of 6,846 [[Kelvin|K]].<ref name = David2015/> HD 201507 is slightly metal enriched, with a [[metallicity]] 123% that of the [[Sun]].<ref name = Netopil2017/> This star has a modest [[projected rotational velocity]] of {{val|16|ul=km/s}}<ref name = DeMederios2014/> and is estimated to be 1.21 [[billion years]] old,<ref name = David2015/> which makes it ~4 times younger than the Sun.


== References ==
== References ==
Line 52: Line 54:
<ref name = GaiaDR2>{{Cite DR2|1731712847900164992}}</ref>
<ref name = GaiaDR2>{{Cite DR2|1731712847900164992}}</ref>


⚫
<ref name = Tycho>{{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 |bibcode=2000A&A...355L..27H |issn=0004-6361 }}</ref>
<ref name = Wilson1953>{{Cite journal|last=Wilson|first=Ralph Elmer|date=1953|title=General catalogue of stellar radial velocities.|url=http://adsabs.harvard.edu/abs/1953GCRV..C......0W|journal=Carnegie Institute Washington D.C. Publication|bibcode=1953GCRV..C......0W}}</ref>


<ref name = Harlan1974>{{cite journal | last1 = Harlan | first1 = E. A. | title = MK classifications for F-and G-type stars. 3. | journal = The Astronomical Journal | date = June 1974 | volume = 79 | page = 682 | issn = 0004-6256 | doi = 10.1086/111597 | bibcode = 1974AJ.....79..682H | doi-access = free}}</ref>
⚫
<ref name = Tycho>{{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.|date=2000-03-01|title=The Tycho-2 catalogue of the 2.5 million brightest stars|url=http://adsabs.harvard.edu/abs/2000A%26A...355L..27H|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H|issn=0004-6361}}</ref>


<ref name = Houk1999>{{Cite journal|last1=Houk|first1=N.|last2=Swift|first2=C.|date=1999|title=Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5|journal=Michigan Spectral Survey|url=http://adsabs.harvard.edu/abs/1999MSS...C05....0H|volume=05|pages=0|bibcode=1999MSS...C05....0H}}</ref>
<ref name = Houk1999>{{cite book | last1 = Houk | first1 = Nancy | last2 = Swift | first2 = Carrie | title = Michigan catalogue of two-dimensional spectral types for the HD Stars ; vol. 5 | year = 1999 | bibcode = 1999mctd.book.....H}}</ref>


<ref name = XHIP>{{Cite journal|last1=Anderson|first1=E.|last2=Francis|first2=Ch.|date=2012-05-01|title=XHIP: An extended hipparcos compilation|url=http://adsabs.harvard.edu/abs/2012AstL...38..331A|journal=Astronomy Letters|volume=38|issue=5|pages=331–346|doi=10.1134/S1063773712050015|issn=1063-7737|arxiv=1108.4971|bibcode=2012AstL...38..331A|s2cid=119257644}}</ref>
<ref name = XHIP>{{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}}</ref>


<ref name = Teff2006>{{Cite journal|last1=Ammons|first1=S. Mark|last2=Robinson|first2=Sarah E.|last3=Strader|first3=Jay|last4=Laughlin|first4=Gregory|last5=Fischer|first5=Debra|last6=Wolf|first6=Aaron|date=2006-02-01|title=The N2K Consortium. IV. New Temperatures and Metallicities for More than 100,000 FGK Dwarfs|url=http://adsabs.harvard.edu/abs/2006ApJ...638.1004A|journal=The Astrophysical Journal|volume=638|issue=2|pages=1004–1017|doi=10.1086/498490|arxiv=astro-ph/0510237|bibcode=2006ApJ...638.1004A|s2cid=118834752|issn=0004-637X}}</ref>
<ref name = David2015>{{cite journal | last1 = David | first1 = Trevor J. | last2 = Hillenbrand | first2 = Lynne A. | title = The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal = The Astrophysical Journal | date = 12 May 2015 | volume = 804 | issue = 2 | page = 146 | eissn = 1538-4357 | doi = 10.1088/0004-637X/804/2/146 | bibcode = 2015ApJ...804..146D | arxiv = 1501.03154 | doi-access = free}}</ref>


<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>
<ref name = Nord2004>{{Cite journal|last1=Nordström|first1=B.|last2=Mayor|first2=M.|last3=Andersen|first3=J.|last4=Holmberg|first4=J.|last5=Pont|first5=F.|last6=Jørgensen|first6=B. R.|last7=Olsen|first7=E. H.|last8=Udry|first8=S.|last9=Mowlavi|first9=N.|date=2004-05-01|title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14 000 F and G dwarfs|url=http://adsabs.harvard.edu/abs/2004A%26A...418..989N|journal=Astronomy and Astrophysics|volume=418|pages=989–1019|doi=10.1051/0004-6361:20035959|arxiv=astro-ph/0405198|bibcode=2004A&A...418..989N|s2cid=11027621|issn=0004-6361}}</ref>


<ref name = Netopil2017>{{cite journal | last1 = Netopil | first1 = Martin | title = Metallicity calibrations for dwarf stars and giants in the Geneva photometric system | journal = Monthly Notices of the Royal Astronomical Society | date = 4 May 2017 | volume = 469 | issue = 3 | pages = 3042–3055 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1093/mnras/stx1077 | bibcode = 2017MNRAS.469.3042N | arxiv = 1705.00883 | doi-access = free}}</ref>
<ref name = David2015>{{Cite journal|last1=David|first1=Trevor J.|last2=Hillenbrand|first2=Lynne A.|date=2015-05-01|title=The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets|url=http://adsabs.harvard.edu/abs/2015ApJ...804..146D|journal=The Astrophysical Journal|volume=804|issue=2|pages=146|doi=10.1088/0004-637X/804/2/146|arxiv=1501.03154|bibcode=2015ApJ...804..146D|s2cid=33401607|issn=0004-637X}}</ref>

<ref name = Cousins1971>{{cite journal | last1 = Cousins | first1 = A. W. J. | title = Photometric standard stars | journal = Royal Observatory Annals | year = 1971 | volume = 7 | bibcode = 1971ROAn....7.....C}}</ref>


<ref name = SIMBAD>{{Cite web|title=HD 201507|url=http://simbad.u-strasbg.fr/simbad/sim-id?mescat.mk=on&Ident=%401398820&Name=HD+201507/|access-date=2021-07-05|website=sim-id}}</ref>
<ref name = SIMBAD>{{Cite web|title=HD 201507|url=http://simbad.u-strasbg.fr/simbad/sim-id?mescat.mk=on&Ident=%401398820&Name=HD+201507/|access-date=2021-07-05|website=sim-id}}</ref>

<ref name = DeMederios2014>{{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 |pages=A126 |doi=10.1051/0004-6361/201220762 |issn=0004-6361 |bibcode=2014A&A...561A.126D |arxiv=1312.3474|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 |pages=138 |doi=10.3847/1538-3881/ab3467 |issn=0004-6256 |bibcode=2019AJ....158..138S |arxiv=1905.10694 |doi-access=free}}</ref>

<ref name = GouldNEW>{{citation|last=Gould |first=B. A. |title=Uranometria Argentina |publisher=Reprinted and updated by Pilcher, F |url=http://www.uranometriaargentina.com/ |access-date=2012-01-06 |url-status=dead |archive-url=https://web.archive.org/web/20120227032716/http://www.uranometriaargentina.com/ |archive-date=2012-02-27 }}</ref>

}}
}}


Revision as of 21:07, 29 July 2022

HD 201507
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Equuleus
Right ascension 21h 09m 58.2645s[1]
Declination +02° 56′ 37.3096″[1]
Apparent magnitude (V) 6.43±0.01[2]
Characteristics
Spectral type F5 IV[3]
U−B color index +0.06[4]
B−V color index +0.37[4]
Astrometry
Radial velocity (Rv)−42.8±2.4[5] km/s
Proper motion (μ) RA: +48.902 mas/yr[1]
Dec.: +10.883 mas/yr[1]
Parallax (π)15.2530 ± 0.3122 mas[1]
Distance214 ± 4 ly
(66 ± 1 pc)
Absolute magnitude (MV)2.12[6]
Details
Mass1.45±0.23[7] M☉
Radius2.2±0.1[7] R☉
Luminosity9.147±0.21[1] L☉
Surface gravity (log g)3.91±0.09[7] cgs
Temperature6,846±233[8] K
Metallicity [Fe/H]+0.09[9] dex
Rotational velocity (v sin i)16.4±10.6[10] km/s
Age1.21[8] Gyr
Other designations
13 G. Equulei[11], AG+02°2701, BD+02°4311, GC 29582, HD 201507, HIP 104481, HR 8095, SAO 126587[12]
Database references
SIMBADdata

HD 201507, also known as HR 8095, is a white hued star located in the equatorial constellation Equuleus. It has an apparent magnitude of 6.43,[2] placing it near the limit for naked eye visibility. Parallax measurements place the object at a distance of 214 light years[1] and it is currently drifting closer with a heliocentric radial velocity of −43 km/s.[5]

There has been disagreements in classifying the star's spectrum. Eugene A. Harlan found a spectral classification of F5 IV,[3] indicating that it is a F-type subgiant that is evolving torwards the red giant branch. On the other hand, Nancy Houk and Carrie Swift (1999) found a class of F2 V,[13] indicating that it is an F-type main-sequence star.

Nevertheless, HD 201507 has 1.45 time mass of the Sun and a slightly enlarged radius of 2.2 R☉[7] due to its evolved state. It shines with a luminosity of about 9 L☉[1] from its photosphere at an effective temperature of 6,846 K.[8] HD 201507 is slightly metal enriched, with a metallicity 123% that of the Sun.[9] This star has a modest projected rotational velocity of 16 km/s[10] and is estimated to be 1.21 billion years old,[8] which makes it ~4 times younger than the Sun.

References

  1. ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 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.
  3. ^ a b Harlan, E. A. (June 1974). "MK classifications for F-and G-type stars. 3". The Astronomical Journal. 79: 682. Bibcode:1974AJ.....79..682H. doi:10.1086/111597. ISSN 0004-6256.
  4. ^ a b Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals. 7. Bibcode:1971ROAn....7.....C.
  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. ^ 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.
  7. ^ a b c d 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. ISSN 0004-6256.
  8. ^ a b c d David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357.
  9. ^ a b Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. eISSN 1365-2966. ISSN 0035-8711.
  10. ^ 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. ISSN 0004-6361.
  11. ^ Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, retrieved 2012-01-06
  12. ^ "HD 201507". sim-id. Retrieved 2021-07-05.
  13. ^ Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars ; vol. 5. Bibcode:1999mctd.book.....H.
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