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{{short description|Star in the constellation Sextans}}
{{short description|Star in the constellation Sextans}}
{{Starbox begin}}
{{Starbox begin
| name = [[Henry Draper Catalogue|HD]] 93833
}}
{{Starbox observe
{{Starbox observe
|epoch=[[J2000]]
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
|constell=[[Sextans]]
| constell = [[Sextans]]
|ra={{RA|10|49|43.48894}}<ref name="HIP" />
| ra = {{RA|10|49|43.49171}}<ref name = GaiaDR2/>
|dec={{DEC|-09|51|09.6989}}<ref name="HIP" />
| dec = {{DEC|-09|51|09.6859}}<ref name = GaiaDR2/>
|appmag_v=5.842<ref name="TYC2" />
| appmag_v = 5.84{{±|0.01}}<ref name = Tycho2000/>
}}
}}
{{Starbox character
{{Starbox character
|class=K0 III<ref name="Houk1975" />
| type = [[horizontal branch]]<ref name = Laney2011/>
|b-v=+1.07<ref name="Johnson" />
| class = K0 III<ref name = Houk1999/>
|u-b=+0.91<ref name="Johnson" />
| b-v = +1.07<ref name = Johnson1966/>
| u-b = +0.91<ref name = Johnson1966/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
|radial_v=40.3 ± 2<ref name="GCRV" />
| radial_v = 40.3{{±|2.9}}<ref name = Gontcharov2006/>
|prop_mo_ra=10.06<ref name="HIP" />
| prop_mo_ra= +5.882
|prop_mo_dec=−26.87<ref name="HIP" />
| prop_mo_dec = −30.041
| pm_footnote = <ref name = GaiaDR2/>
|parallax=9.57
| parallax = 9.4637
|p_error=0.36
| p_error = 0.1343
|parallax_footnote=<ref name="HIP" />
| parallax_footnote = <ref name = GaiaDR2/>
|absmag_v=<!-- interstellar extinction (A_V) = 0.202 ± 0.017 -->
| absmag_v = +0.76<ref name = Anderson2012/><!-- interstellar extinction (A_V) = 0.202 ± 0.017 -->
}}
}}
{{Starbox detail
{{Starbox detail
|source=<ref name="McDonald" />
| mass = 1.40<ref name = Dotter2008/>
|radius=10.527
| radius = 10.7{{±|0.5}}<ref name = Kervella2004/>
| luminosity = 60.4{{±|1.0}}<ref name = GaiaDR2/>
|temperature=4720 ± 125
| gravity = 2.46<ref name = Luck2015/>
|luminosity=49.414 ± 3.212<!-- 49.414 ± (49.414 × 0.065) -->
| temperature = 4,675{{±|22}}<ref name = Luck2015/>
| metal_fe = −0.11{{±|0.09}}<ref name = Brown1989/>
| rotational_velocity =
| age_gyr = 5.50<ref name = Dotter2008/>
}}
}}
{{Starbox catalog
{{Starbox catalog
|names={{odlist|BD=-09° 3147|HD=93833|HIP=52948|HR=4233|SAO=137815}}
| names = {{odlist|Gould = 73 G. Sextantis<ref name = Gould1879/>|BD = −09°3147|HD = 93833|HIP = 52948|HR = 4233|SAO = 137815|GC = 14900|TIC = 55109651}}<ref name = SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
|Simbad=HD+93833
| Simbad = HD+93833
}}
}}
{{Starbox end}}
{{Starbox end}}
'''HD 93833''' ('''HR 4233; 73 G. Sextantis''') is a solitary [[star]] located in the [[celestial equator|equatorial]] [[constellation]] [[Sextans]]. It is faintly visible to the [[naked eye]] as an orange-hued point of light with an [[apparent magnitude]] of 5.84.<ref name = Tycho2000/> [[Gaia DR2]] [[parallax]] measurements imply a distance of 345 [[light-year]]s<ref name = GaiaDR2/> and it receding with a heliocentric [[radial velocity]] of {{val|40.3|ul=km/s}}.<ref name = Gontcharov2006/> At its current distance, HD 93833's brightness is diminished by an [[interstellar extinction]] of 0.18 [[magnitude (astronomy)|magnitude]]s<ref name = Gontcharov2017/> and it has an [[absolute magnitude]] of +0.76.<ref name = Anderson2012/>
'''HD 93833''' is a [[star]] in the [[constellation]] of [[Sextans]]. Its [[apparent magnitude]] is 5.842,<ref name="TYC2" /> but interstellar dust makes it appear 0.202 magnitudes dimmer than it should be.<ref name="McDonald" /> It is located some 340 light-years (104 parsecs) away, based on [[stellar parallax|parallax]].<ref name="HIP" />


HD 93833 has a [[stellar classification]] of K0 III,<ref name = Houk1999/> indicating that it is an [[stellar evolution|evolved]] [[K-type star|K-type]] [[giant star]] that has exhausted [[hydrogen]] at its [[stellar core|core]] and left the [[main sequence]]. It is currently a [[red clump]] star that is on the [[horizontal branch]]—fusing [[helium]] at its core.<ref name = Laney2011/> It has 1.4 times the [[mass of the Sun]] but at the age of 5.5 [[billion years]],<ref name = Dotter2008/> it has expanded to 10.7 times the [[radius of the Sun]].<ref name = Kervella2004/> It radiates 60.4 times the [[luminosity of the Sun]]<ref name = GaiaDR2/> from its [[photosphere]] at an [[effective temperature]] of {{val|4675|ul=K|fmt=commas}}.<ref name = Luck2015/> HD 93833 is slightly metal deficient with an [[iron]] abundance of [Fe/H] = −0.11 or 77.6% of the [[Sun]]'s abundance.<ref name = Brown1989/>
HD 93833 is a [[K-type star|K-type]] [[giant star]]. It has evolved from the [[main sequence]] to a radius of 10.5 times that of the [[Sun]]. It emits 49.4 times as much energy as the Sun at a surface temperature of 4,720 [[Kelvin|K]].<ref name="McDonald" />


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

<ref name="HIP">{{cite journal|title=Validation of the new Hipparcos reduction|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid=18759600}}</ref>
<ref name = GaiaDR2>{{Cite DR2|3761235970733651712}}</ref>
<ref name="TYC2">{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}</ref>

<ref name="Houk1975">{{cite journal|bibcode=1975mcts.book.....H|title=University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90°.0 to -53°.0.|journal=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars|volume=1|author1=Houk, N.|author2=Cowley, A. P.|year=1975}}</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="Johnson">{{cite journal|title=UBVRIJKL Photometry of the Bright Stars|author1=Johnson, H. L.|journal=Communications of the Lunar and Planetary Laboratory|volume=4|pages=99|date=1966|bibcode=1966CoLPL...4...99J}}</ref>

<ref name="GCRV">{{cite journal|title=General catalogue of stellar radial velocities|journal=Washington|author=Wilson, Ralph Elmer|date=1953|bibcode=1953GCRV..C......0W}}</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 | volume = 5 | year = 1999 | bibcode = 1999mctd.book.....H}}</ref>
<ref name="McDonald">{{cite journal|bibcode=2017MNRAS.471..770M|doi=10.1093/mnras/stx1433|arxiv=1706.02208|title=Fundamental parameters and infrared excesses of Tycho-Gaia stars|journal=Monthly Notices of the Royal Astronomical Society|volume=471|pages=770–791|year=2017|last1=McDonald|first1=I.|last2=Zijlstra|first2=A. A.|last3=Watson|first3=R. A.|issue=1 }}</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 = 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 = 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 = Brown1989>{{cite journal | last1 = Brown | first1 = Jeffery A. | last2 = Sneden | first2 = Christopher | last3 = Lambert | first3 = David L. | last4 = Dutchover | first4 = Edward Jr. | title = A search for lithium-rich giant stars | journal = The Astrophysical Journal Supplement Series | date = October 1989 | volume = 71 | page = 293 | issn = 0067-0049 | eissn = 1538-4365 | doi = 10.1086/191375 | bibcode = 1989ApJS...71..293B | doi-access = free}}</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 = April 8, 2004 | volume = 426 | issue = 1 | pages = 297–307 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:20035930 | s2cid = 6077801 | bibcode = 2004A&A...426..297K | arxiv = astro-ph/0404180 | doi-access = free}}</ref>

<ref name = Luck2015>{{cite journal | last1 = Luck | first1 = R. Earle | title = Abundances in the Local Region. I. G and K Giants | journal = The Astronomical Journal | date = 25 August 2015 | volume = 150 | issue = 3 | pages = 88 | doi = 10.1088/0004-6256/150/3/88 | issn = 0004-6256 | arxiv = 1507.01466 | bibcode = 2015AJ....150...88L | s2cid = 118505114 | eissn = 1538-3881}}</ref>

<ref name = Dotter2008>{{cite journal | last1 = Dotter | first1 = Aaron | last2 = Chaboyer | first2 = Brian | last3 = Jevremović | first3 = Darko | last4 = Kostov | first4 = Veselin | last5 = Baron | first5 = E. | last6 = Ferguson | first6 = Jason W. | title = The Dartmouth Stellar Evolution Database | journal = The Astrophysical Journal Supplement Series | s2cid = 119290835 | date = September 2008 | volume = 178 | issue = 1 | pages = 89–101 | issn = 0067-0049 | eissn = 1538-4365 | doi = 10.1086/589654 | bibcode = 2008ApJS..178...89D | arxiv = 0804.4473 | doi-access = free}}</ref>

<ref name = Laney2011>{{cite journal | last1 = Laney | first1 = C. D. | last2 = Joner | first2 = M. D. | last3 = Pietrzyński | first3 = G. | title = A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars | journal = Monthly Notices of the Royal Astronomical Society | date = 11 November 2011 | volume = 419 | issue = 2 | pages = 1637–1641 | issn = 0035-8711 | doi = 10.1111/j.1365-2966.2011.19826.x | s2cid = 117788450 | bibcode = 2012MNRAS.419.1637L | arxiv = 1109.4800 | doi-access = free }}</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 = Gould1879>{{cite journal | last = Gould | first = Benjamin Apthorp | title = Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas | journal = Resultados del Observatorio Nacional Argentino | volume = 1 | bibcode = 1879RNAO....1.....G | year = 1878}}</ref>

<ref name = SIMBAD>{{Cite simbad|title = HD 93833|access-date = January 11, 2024}}</ref>

}}
}}


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[[Category:Hipparcos objects|052948]]
[[Category:Hipparcos objects|052948]]
[[Category:Bright Star Catalogue objects|4233]]
[[Category:Bright Star Catalogue objects|4233]]


{{giant-star-stub}}

Revision as of 23:32, 12 January 2024

HD 93833
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 10h 49m 43.49171s[1]
Declination −09° 51′ 09.6859″[1]
Apparent magnitude (V) 5.84±0.01[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K0 III[4]
U−B color index +0.91[5]
B−V color index +1.07[5]
Astrometry
Radial velocity (Rv)40.3±2.9[6] km/s
Proper motion (μ) RA: +5.882 mas/yr[1]
Dec.: −30.041 mas/yr[1]
Parallax (π)9.4637 ± 0.1343 mas[1]
Distance345 ± 5 ly
(106 ± 1 pc)
Absolute magnitude (MV)+0.76[7]
Details
Mass1.40[8] M☉
Radius10.7±0.5[9] R☉
Luminosity60.4±1.0[1] L☉
Surface gravity (log g)2.46[10] cgs
Temperature4,675±22[10] K
Metallicity [Fe/H]−0.11±0.09[11] dex
Age5.50[8] Gyr
Other designations
73 G. Sextantis[12], BD−09°3147, GC 14900, HD 93833, HIP 52948, HR 4233, SAO 137815, TIC 55109651[13]
Database references
SIMBADdata

HD 93833 (HR 4233; 73 G. Sextantis) is a solitary star located in the equatorial constellation Sextans. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.84.[2] Gaia DR2 parallax measurements imply a distance of 345 light-years[1] and it receding with a heliocentric radial velocity of 40.3 km/s.[6] At its current distance, HD 93833's brightness is diminished by an interstellar extinction of 0.18 magnitudes[14] and it has an absolute magnitude of +0.76.[7]

HD 93833 has a stellar classification of K0 III,[4] indicating that it is an evolved K-type giant star that has exhausted hydrogen at its core and left the main sequence. It is currently a red clump star that is on the horizontal branch—fusing helium at its core.[3] It has 1.4 times the mass of the Sun but at the age of 5.5 billion years,[8] it has expanded to 10.7 times the radius of the Sun.[9] It radiates 60.4 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,675 K.[10] HD 93833 is slightly metal deficient with an iron abundance of [Fe/H] = −0.11 or 77.6% of the Sun's abundance.[11]

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. S2CID 17128864.
  3. ^ a b Laney, C. D.; Joner, M. D.; Pietrzyński, G. (11 November 2011). "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars". Monthly Notices of the Royal Astronomical Society. 419 (2): 1637–1641. arXiv:1109.4800. Bibcode:2012MNRAS.419.1637L. doi:10.1111/j.1365-2966.2011.19826.x. ISSN 0035-8711. S2CID 117788450.
  4. ^ a b Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars. Vol. 5. Bibcode:1999mctd.book.....H.
  5. ^ a b 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.
  6. ^ 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.
  7. ^ 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.
  8. ^ a b c Dotter, Aaron; Chaboyer, Brian; Jevremović, Darko; Kostov, Veselin; Baron, E.; Ferguson, Jason W. (September 2008). "The Dartmouth Stellar Evolution Database". The Astrophysical Journal Supplement Series. 178 (1): 89–101. arXiv:0804.4473. Bibcode:2008ApJS..178...89D. doi:10.1086/589654. eISSN 1538-4365. ISSN 0067-0049. S2CID 119290835.
  9. ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 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.
  10. ^ a b c Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. eISSN 1538-3881. ISSN 0004-6256. S2CID 118505114.
  11. ^ a b Brown, Jeffery A.; Sneden, Christopher; Lambert, David L.; Dutchover, Edward Jr. (October 1989). "A search for lithium-rich giant stars". The Astrophysical Journal Supplement Series. 71: 293. Bibcode:1989ApJS...71..293B. doi:10.1086/191375. eISSN 1538-4365. ISSN 0067-0049.
  12. ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  13. ^ "HD 93833". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved January 11, 2024.
  14. ^ 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.
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