HD 50890
  | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 54m 58.91715s |
| Declination | −02° 48′ 12.9229″ |
| Apparent magnitude (V) | 6.017 |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | K1III |
| B−V color index | 1.095 |
| J−H color index | 0.650 |
| J−K color index | 0.715 |
| Astrometry | |
| Radial velocity (Rv) | 19.5 ± 2.0 km/s |
| Proper motion (μ) | RA: −5.225 mas/yr Dec.: −1.372 mas/yr |
| Parallax (π) | 3.6718±0.0303 mas |
| Distance | 888 ± 7 ly (272 ± 2 pc) |
| Details | |
| Mass | 5.6±1.7 M☉ |
| Radius | 35.76±5.31 R☉ |
| Luminosity | 517.8±17.5 L☉ |
| Surface gravity (log g) | 1.85±0.26 cgs |
| Temperature | 4730±95 K |
| Metallicity [Fe/H] | −0.02±0.13 dex |
| Rotational velocity (v sin i) | 10±2 km/s |
| Age | 165+20 −15 Myr |
| Other designations | |
| BD−02°1827, GC 9070, HD 50890, HIP 33243, HR 2582, SAO 133890, PPM 189689, TIC 282893379, TYC 4805-3804-1, GCRV 4527, GSC 04805-03804, IRAS 06524-0244, 2MASS J06545892-0248129 | |
| Database references | |
| SIMBAD | data |
HD 50890 is an orange-hued star in the constellation of Monoceros. With an apparent magnitude of 6.017, it is faintly visible to the naked eye under dark skies. As such, it is listed in the Bright Star Catalogue as HR 2582. It is located at a distance of 888 light-years (272 parsecs) according to Gaia DR3 parallax measurements, and is receding away from the Solar System at a heliocentric radial velocity of 19.5 km/s.
Physical properties
This is an aging red giant whose spectral energy distribution best matches a spectral type of K1III, albeit previous studies gave it slightly differing types of G6III or K2III. It is about 5.6 times as massive as the Sun; these massive stars quickly pass through their final stages of evolution, thus only a few of them can be observed as red giants, making HD 50890 a rare such instance. The star has expanded to a radius of 35.76±5.31 R☉ and radiates 518 times the luminosity of the Sun from its inflated photosphere at an effective temperature of 4,730 K (4,460 °C; 8,050 °F). It rotates at a projected velocity of 10±2 km/s, unusually fast for a giant star. It has an age estimate of 165+20
−15 million years, at which several evolutionary stages are possible: it could be burning hydrogen in a shell around the core, which would imply an age of ~157 Myr; alternatively, it may be fusing helium at its core, placing the age at ~163 or ~180 Myr. The star exhibits solar-like oscillations at a frequency between 10 and 20 μHz.
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 Høg, E.; et al. (February 2000). "The Tycho-2 Catalogue of the 2.5 Million Brightest Stars". Astronomy and Astrophysics. 355 (1): L27–L30. Bibcode:2000A&A...355L..27H.
- 1 2 3 4 Baines, Ellyn K.; McAlister, Harold A.; ten Brummelaar, Theo A.; Turner, Nils H.; Sturmann, Judit; Sturmann, Laszlo; Farrington, Christopher D.; Vargas, Norm; van Belle, Gerard T.; Ridgway, Stephen T. (1 July 2013). "Characterization of the Red Giant Hr 2582 Using the Chara Array". The Astrophysical Journal. 772 (1): 16. arXiv:1306.1236. Bibcode:2013ApJ...772...16B. doi:10.1088/0004-637X/772/1/16. ISSN 0004-637X.
- 1 2 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
- ↑ Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
- 1 2 3 4 Morel, T.; Miglio, A.; Lagarde, N.; Montalbán, J.; Rainer, M.; Poretti, E.; Eggenberger, P.; Hekker, S.; Kallinger, T.; Mosser, B.; Valentini, M.; Carrier, F.; Hareter, M.; Mantegazza, L. (2014). "Atmospheric parameters and chemical properties of red giants in the CoRoT asteroseismology fields". Astronomy & Astrophysics. 564: A119. arXiv:1403.4373. Bibcode:2014A&A...564A.119M. doi:10.1051/0004-6361/201322810. ISSN 0004-6361.
- 1 2 3 4 5 Baudin, F.; Barban, C.; Goupil, M. J.; Samadi, R.; Lebreton, Y.; Bruntt, H.; Morel, T.; Lefèvre, L.; Michel, E.; Mosser, B.; Carrier, F.; De Ridder, J.; Hatzes, A.; Hekker, S.; Kallinger, T.; Auvergne, M.; Baglin, A.; Catala, C. (2012). "Modelling a high-mass red giant observed by CoRoT". Astronomy & Astrophysics. 538: A73. arXiv:1111.6543. Bibcode:2012A&A...538A..73B. doi:10.1051/0004-6361/201116967. ISSN 0004-6361.
- ↑ "HD 50890". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 February 2025.
- ↑ Medhi, B. J.; Messina, S.; Parihar, Padmakar S.; Pagano, I.; Muneer, S.; Duorah, K. (2007). "Results from a spectroscopic survey in the CoRoT fields: I. Search for chromospherically active stars". Astronomy & Astrophysics. 469 (2): 713–719. Bibcode:2007A&A...469..713M. doi:10.1051/0004-6361:20054173. ISSN 0004-6361.
