HD 93833

HD 93833

Location of HD 93833 on the map (circled)
Observation data Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation	Sextans [1]
Right ascension	10h 49m 43.49171s [2]
Declination	−09° 51′ 09.6859″ [2]
Apparent magnitude  (V)	5.84±0.01 [3]
Characteristics
Evolutionary stage	red clump [4]
Spectral type	K0 III [5]
U−B color index	+0.91 [6]
B−V color index	+1.07 [6]
Astrometry
Radial velocity (Rv)	40.3±2.9 [7] km/s
Proper motion (μ)	RA: +5.882 mas/yr [2] Dec.: −30.041 mas/yr [2]
Parallax (π)	9.4637±0.1343  mas [2]
Distance	345 ± 5  ly (106 ± 1  pc)
Absolute magnitude  (MV)	+0.76 [1]
Details
Mass	1.40 [8]   M☉
Radius	10.7±0.5 [9]   R☉
Luminosity	60.4±1.0 [2]   L☉
Surface gravity (log g)	2.46 [10]   cgs
Temperature	4,675±22 [10]   K
Metallicity [Fe/H]	−0.11±0.09 [11]   dex
Age	5.50 [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
SIMBAD	data

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. ^[3] Gaia DR2 parallax measurements imply a distance of 345 light-years ^[2] and it receding with a heliocentric radial velocity of 40.3  km/s . ^[7] 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. ^[1]

HD 93833 has a stellar classification of K0 III, ^[5] 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. ^[4] 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 ^[2] 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. 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.
2. 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.
3. 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.
4. 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.
5. Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars. Vol. 5. Bibcode:1999mctd.book.....H.
6. 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.
7. 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.
8. 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. 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. 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. 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.