Astronomy:Gamma Monocerotis
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Short description: Star in the constellation of Monoceros
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 14m 51.33367s[1] |
| Declination | −06° 16′ 29.1880″[1] |
| Apparent magnitude (V) | 3.96[2] |
| Characteristics | |
| Spectral type | K1.5IIIBa0.3[3] |
| U−B color index | +1.42[2] |
| B−V color index | +1.31[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.8±0.7[4] km/s |
| Proper motion (μ) | RA: −4.69[1] mas/yr Dec.: −19.30[1] mas/yr |
| Parallax (π) | 6.55 ± 0.19[1] mas |
| Distance | 500 ± 10 ly (153 ± 4 pc) |
| Absolute magnitude (MV) | -1.93[5] |
| Details[6] | |
| Mass | 4.09±0.14 M☉ |
| Radius | 50.8+1.5 −1.6 R☉ |
| Luminosity | 1,247±96 L☉ |
| Surface gravity (log g) | 1.61[7] cgs |
| Temperature | 4,810±66 K |
| Metallicity [Fe/H] | −0.15[7] dex |
| Rotational velocity (v sin i) | 4.0[8] km/s |
| Age | 170±20 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
γ Monocerotis, Latinised as Gamma Monocerotis, is a binary star[9] system in the equatorial constellation of Monoceros. Based upon an annual parallax shift of 6.55 mas,[1] it is located roughly 500 light years from the Sun. It can be viewed with the naked eye, having an apparent visual magnitude of 3.96.[2] Gamma Monocerotis is moving away from the Sun with a radial velocity of −5 km/s.[4]
This is an evolved K-type giant star with a stellar classification of K1.5 III Ba0.3.[3] The Ba0.3 suffix indicates this is a mild barium star, which means the spectrum displays abnormal abundance of s-process elements, including barium. These were deposited by an orbiting companion as it passed through the asymptotic giant branch stage. The companion is now a white dwarf star.[10]
It has reported companions B, at separation 53.7" and magnitude 13.1, and C, at separation 47.9" and magnitude 13.6.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 3.0 3.1 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H.
- ↑ 4.0 4.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ Baines, Ellyn K.; Armstrong, J. Thomas; Schmitt, Henrique R.; Zavala, R. T.; Benson, James A.; Hutter, Donald J.; Tycner, Christopher; Van Belle, Gerard T. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B.
- ↑ 7.0 7.1 Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. Bibcode: 2011A&A...525A..71W.
- ↑ 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". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D. Vizier catalog entry
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Yang, Guo-Chao et al. (January 2016), "Chemical abundance analysis of 19 barium stars", Research in Astronomy and Astrophysics 16 (1): 019, doi:10.1088/1674-4527/16/1/019, 19, Bibcode: 2016RAA....16...19Y.
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. Vizier catalog entry
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