HD 89998

This article is about r Velorum. For R Velorum, see HD 87816.
HD 89998
Location of HD 89998 (circled in red)
Observation data
Epoch J2000      Equinox J2000
Constellation Vela[1]
Right ascension 10h 22m 19.58477s[2]
Declination −41° 38′ 59.8592″[2]
Apparent magnitude (V) 4.82[1]
Characteristics
Spectral type K1 III[3]
B−V color index 1.095±0.055[1]
Astrometry
Radial velocity (Rv)+20.9±0.8[4] km/s
Proper motion (μ) RA: −27.664[2] mas/yr
Dec.: +60.090[2] mas/yr
Parallax (π)15.9154±0.1375 mas[2]
Distance205 ± 2 ly
(62.8 ± 0.5 pc)
Absolute magnitude (MV)0.84[1]
Details
Mass1.9[5] M☉
Radius11.0[6] R☉
Luminosity56[6] L☉
Surface gravity (log g)2.77[5] cgs
Temperature4,761[6] K
Metallicity [Fe/H]+0.12[5] dex
Rotational velocity (v sin i)<1.0[7] km/s
Other designations
r Vel, NSV 4837, CD−41°5809, FK5 1268, HD 89998, HIP 50799, HR 4080, SAO 221998[8]
Database references
SIMBADdata

HD 89998 (r Velorum) is a single[9] star in the southern constellation of Vela. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.82.[1] The distance to HD 89998, as determined from its annual parallax shift of 15.9 mas,[2] is 205 light years. The star is moving further from the Earth with a heliocentric radial velocity of +21 km/s,[4] having come within 140 ly some 1.552 million years ago.[1]

This is an evolved giant star with a stellar classification of K1 III.[3] The measured angular diameter of this star, after correcting for limb darkening, is 1.72±0.02 mas.[10] At the estimated distance of this star, this yields a physical size of 11.6 times the radius of the Sun.[11] It is radiating 56 times the Sun's luminosity from its enlarged photosphere at en effective temperature of 4,761 K.[6]

References

  1. ^ a b c d e f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. ^ a b c d e f 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. ^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  5. ^ a b c Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  6. ^ a b c d Hon, Marc; Huber, Daniel; Kuszlewicz, James S.; Stello, Dennis; Sharma, Sanjib; Tayar, Jamie; Zinn, Joel C.; Vrard, Mathieu; Pinsonneault, Marc H. (2021). "A "Quick Look" at All-sky Galactic Archeology with TESS: 158,000 Oscillating Red Giants from the MIT Quick-look Pipeline". The Astrophysical Journal. 919 (2): 131. arXiv:2108.01241. Bibcode:2021ApJ...919..131H. doi:10.3847/1538-4357/ac14b1.
  7. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
  8. ^ "HD 85622". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-08.
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
  11. ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:

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