HD 88981
  | |
| 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] |
| Distance | 310 ± 3 ly (95.2 ± 0.9 pc) |
| Details | |
| Mass | 2.14±0.40[6] M☉ |
| Radius | 4.45+0.35 −0.16[1] R☉ |
| Luminosity | 62.9±0.7[1] L☉ |
| Surface gravity (log g) | 3.52±0.39[6] cgs |
| Temperature | 7,706+142 −289[1] K |
| Rotational velocity (v sin i) | 60[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.
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
[edit]- ^ a b c d e f g h i j 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.
- ^ a b 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.
- ^ a b 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.
- ^ a b 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.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
- ^ a b c 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.
- ^ a b 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.
- ^ "HR 4025". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-02-25.
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