HD 50890

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HD 50890
Monoceros constellation map.svg
Red circle.svg
Location of HD 50890 (circled)
Observation data
Epoch J2000.0 [1]        Equinox J2000.0 [1]
Constellation Monoceros
Right ascension 06h 54m 58.91715s
Declination −02° 48′ 12.9229″
Apparent magnitude  (V)6.017 [2]
Characteristics
Spectral type K1III [3]
B−V color index 1.095 [2]
J−H color index 0.650 [4]
J−K color index 0.715 [4]
Astrometry
Radial velocity (Rv)19.5 ± 2.0 [5]  km/s
Proper motion (μ)RA: −5.225 [6]   mas/yr
Dec.: −1.372 [6]   mas/yr
Parallax (π)3.6718 ± 0.0303  mas [6]
Distance 888 ± 7  ly
(272 ± 2  pc)
Details [3]
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 [7]   cgs
Temperature 4730±95 [7]   K
Metallicity [Fe/H]−0.02±0.13 [7]   dex
Rotational velocity (v sin i)10±2 [8]  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 [1]
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 EDR3 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, [3] albeit previous studies gave it slightly differing types of G6III [8] or K2III. [9] 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. [8] 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, [8] unusually fast for a giant star. [7] 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. [3] The star exhibits solar-like oscillations at a frequency between 10 and 20 µHz. [8]

References

  1. 1 2 3 "HD 50890". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 15 February 2025.
  2. 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.
  3. 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.
  4. 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.
  5. ↑ Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
  6. 1 2 3 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  7. 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.
  8. 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.
  9. ↑ 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.
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