HD 88981

M Carinae (HD 88981) is a solitary star in the constellation Carina. It has an apparent magnitude of +5.154,[2] making it faintly visible to the naked eye under ideal and is located approximately 310[1] light-years from Earth. With a heliocentric radial velocity of −15.2 km/s[5] M Carinae is drifting closer to the Solar System.

This article is about M Carinae. For m Carinae, see HD 83944.
M Carinae
Location of M Carinae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 10h 13m 30.6318s[1]
Declination −66° 22′ 22.1166″[1]
Apparent magnitude (V) 5.154±0.009[2]
Characteristics
Spectral type kA8 mF4 III[3]
U−B color index +0.18[4]
B−V color index +0.22[4]
Astrometry
Radial velocity (Rv)−15.2 ± 2[5] km/s
Proper motion (μ) RA: −34.330[1] mas/yr
Dec.: +11.333[1] mas/yr
Parallax (π)10.5045 ± 0.1031 mas[1]
Distance310 ± 3 ly
(95.2 ± 0.9 pc)
Details
Mass2.14±0.40[6] M☉
Radius4.45+0.35
−0.16[1] R☉
Luminosity62.9±0.7[1] L☉
Surface gravity (log g)3.52±0.39[6] cgs
Temperature7,706+142
−289[1] K
Rotational velocity (v sin i)60[7] km/s
Other designations
M Carinae, CPD−65°1273, GC 14066, HD 88981, HIP 50083, HR 4025, SAO 250880, GSC 08955-01326[8]
Database references
SIMBADdata

M Car has a stellar classification of kA8 mF4 III[3] which indicates that it has the calcium K-line and surface temperature of an A8 star and the metallic lines of an evolved F-type giant that has just exhausted hydrogen fusion at its core. At present M Car has 2.14[6] times the mass of the Sun but has mildly expanded to 4.45 times its girth. It shines at a luminosity almost 63 times greater than the Sun from its bloated photosphere at an effective temperature of 7,706 K, [1] which gives it the white glow of an A-type star. M Car spins moderately at a projected rotational velocity of 60 km/s,[7] slightly faster than most Am stars.

References
  1. 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. 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.
  3. Hoffleit, Dorrit (1953). "The spectra and absolute magnitudes of 500 A3 - G2 stars". Annals of Harvard College Observatory. 119: 1–35. Bibcode:1953AnHar.119....1H.
  4. 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.
  5. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
  6. Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; Paegert, Martin; De Lee, Nathan; Torres, Guillermo; Latham, David W.; Charpinet, Stéphane; Dressing, Courtney D.; Huber, Daniel; Kane, Stephen R. (September 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. ISSN 0004-6256.
  7. Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode:1953ApJ...118..285H. doi:10.1086/145751. ISSN 0004-637X.
  8. "HR 4025". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-02-25.
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