Astronomy:HD 88231

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Short description: Suspected variable; Leo Minor
HD 88231
Location of HD 88231 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Leo Minor
Right ascension  10h 11m 12.77777s[1]
Declination +37° 24′ 06.8383″[1]
Apparent magnitude (V) 5.84[2] (5.79 - 5.88)[3]
Characteristics
Spectral type K3 III[4]
B−V color index +1.29[5]
Variable type suspected[6]
Astrometry
Radial velocity (Rv)7.38±0.22[7] km/s
Proper motion (μ) RA: −20.679[1] mas/yr
Dec.: −29.496[1] mas/yr
Parallax (π)5.7353 ± 0.0663[1] mas
Distance569 ± 7 ly
(174 ± 2 pc)
Absolute magnitude (MV)−0.59[8]
Details
Mass1.17[9] M☉
Radius24.9±1.3[10] R☉
Luminosity228±5[1] L☉
Surface gravity (log g)1.76+0.10−0.06[11] cgs
Temperature4,487±122[12] K
Metallicity [Fe/H]+0.05[9] dex
Other designations
NSV 4764, BD+38°2110, FK5 2817, GC 13985, HD 88231, HIP 49893, HR 3993, SAO 61914[13]
Database references
SIMBADdata

HD 88231, also known as HR 3993, is a solitary orange-hued star located in the northern constellation Leo Minor. It has an apparent magnitude of 5.84,[2] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of about 569 light-years,[1] and the object is currently receding with a heliocentric radial velocity of 7.38 km/s.[7] At its current distance, HD 88231's brightness is diminished by 0.17 magnitudes due to interstellar extinction[14] and it has an absolute magnitude of −0.59.[8]

The object has a stellar classification of K3 III,[4] indicating that it is an evolved red giant star. It has a comparable mass to the Sun[9] but it has expanded to 24.9 times the radius of the Sun.[10] It radiates 228 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,487 K.[12] HD 88231 is slightly metal enriched with an iron abundance 112% that of the Sun ([Fe/H] = +0.05).[9]

HD 88231 was suspected to be variable in the K-band based on Two-Micron Sky Survey observations in 1969.[15] A 1994 paper found that it ranges from 5.79 to 5.88 in the visual band.[3] As of 2004 however, the variability has not been confirmed.[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 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 Percy, John R.; Wong, Nancy; Bohme, Dietmar; Curott, David R.; Dempsey, Frank; Fortier, George L.; Ganis, Matt; Parello, Stephanie et al. (June 1994). "Photometric surveys of suspected small-amplitude red variables III: an AAVSO photometric photometry survey". Publications of the Astronomical Society of the Pacific (IOP Publishing) 106: 611. doi:10.1086/133420. ISSN 0004-6280. Bibcode: 1994PASP..106..611P. 
  4. ↑ 4.0 4.1 Wilson, Ralph E.; Joy, Alfred H. (March 1950). "Radial Velocities of 2111 Stars.". The Astrophysical Journal 111: 221. doi:10.1086/145261. ISSN 0004-637X. Bibcode: 1950ApJ...111..221W. 
  5. ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode: 1970Priv.........0H. 
  6. ↑ Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80–88. doi:10.1134/S1063772917010085. ISSN 1063-7729. Bibcode: 2017ARep...61...80S. 
  7. ↑ 7.0 7.1 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 9.2 9.3 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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  10. ↑ 10.0 10.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  11. ↑ Takagi, Yuhei; Itoh, Yoichi; Oasa, Yumiko (April 25, 2010). "Age-Determination Method of Pre-Main Sequence Stars with High-Resolution I-Band Spectroscopy". Publications of the Astronomical Society of Japan (Oxford University Press (OUP)) 62 (2): 501–508. doi:10.1093/pasj/62.2.501. ISSN 0004-6264. Bibcode: 2010PASJ...62..501T. 
  12. ↑ 12.0 12.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  13. ↑ "HD 88231". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+88231. 
  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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  15. ↑ Neugebauer, G.; Leighton, Robert B. (August 1969). "Two-micron sky survey; a preliminary catalog.". NASA Special Publication 3047. Bibcode: 1969NASSP3047.....N. 
  16. ↑ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode: 2004yCat.2250....0S. 



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