Astronomy:HD 93833

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Short description: Star in the constellation Sextans
HD 93833
Location of HD 93833 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[1] mas/yr
Dec.: −30.041[1] mas/yr
Parallax (π)9.4637 ± 0.1343[1] mas
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
BD−09°3147, GC 14900, HD 93833, HIP 52948, HR 4233, SAO 137815[12]
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[13] 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 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. doi:10.1111/j.1365-2966.2011.19826.x. ISSN 0035-8711. Bibcode: 2012MNRAS.419.1637L. 
  4. ↑ 4.0 4.1 Houk, Nancy; Swift, Carrie (1999). Michigan catalogue of two-dimensional spectral types for the HD Stars. 5. Bibcode: 1999mctd.book.....H. 
  5. ↑ 5.0 5.1 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. ↑ 6.0 6.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  8. ↑ 8.0 8.1 8.2 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. doi:10.1086/589654. ISSN 0067-0049. Bibcode: 2008ApJS..178...89D. 
  9. ↑ 9.0 9.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  10. ↑ 10.0 10.1 10.2 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. ISSN 0004-6256. Bibcode: 2015AJ....150...88L. 
  11. ↑ 11.0 11.1 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. doi:10.1086/191375. ISSN 0067-0049. Bibcode: 1989ApJS...71..293B. 
  12. ↑ "HD 93833". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+93833. 
  13. ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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