Astronomy:Upsilon Geminorum
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Gemini |
| Right ascension | 07h 35m 55.34970s[1] |
| Declination | +26° 53′ 44.6751″[1] |
| Apparent magnitude (V) | 4.04[2] (4.04 - 4.08[3]) |
| Characteristics | |
| Spectral type | M0 III[4] |
| U−B color index | +1.96[2] |
| B−V color index | +1.54[2] |
| Variable type | suspected[3] |
| Astrometry | |
| Radial velocity (Rv) | −21.61±0.19[5] km/s |
| Proper motion (μ) | RA: −34.12[1] mas/yr Dec.: -106.96[1] mas/yr |
| Parallax (π) | 12.04 ± 0.68[1] mas |
| Distance | 270 ± 20 ly (83 ± 5 pc) |
| Absolute magnitude (MV) | −0.53[6] |
| Details | |
| Mass | 1.52[7] M☉ |
| Radius | 44[5] R☉ |
| Luminosity | 417[5] L☉ |
| Surface gravity (log g) | 1.0[5] cgs |
| Temperature | 3,926±16[5] K |
| Metallicity [Fe/H] | 0.17[7] dex |
| Rotational velocity (v sin i) | 5.9[5] km/s |
| Age | 3.53[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Upsilon Geminorum, Latinized from υ Geminorum, is a star in the constellation Gemini. It has an apparent visual magnitude of 4.04,[2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.04 mas,[1] it is around 270 light years from the Sun. There is a visual companion: a magnitude 13.20 star located at an angular separation of 55.20″ along a position angle of 40°, as of 2008.[9]
This is an evolved red giant star with a stellar classification of M0 III.[4] It is estimated to have 1.52[7] times the mass of the Sun, but has expanded to 44[5] times the Sun's radius. The star is spinning with a projected rotational velocity of 5.9 km/s[5] and is about 3.53[7] billion years old. Upsilon Geminorum is radiating 417 times the solar luminosity from its outer atmosphere at an effective temperature of 3926 K.[5]
Based upon the motion of this star through space, Upsilon Geminorum is a member of the Wolf 630 moving group. This is a set of stars centered on Wolf 630 that are moving nearly in parallel and have an age of around 2.7±0.5 billion years. They may be former members of a dissolved open cluster.[10]
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.
- ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data (SIMBAD), Bibcode: 1986EgUBV........0M.
- ↑ 3.0 3.1 Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S 1. Bibcode: 2009yCat....102025S.
- ↑ 4.0 4.1 Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics 11: 29, doi:10.1146/annurev.aa.11.090173.000333, Bibcode: 1973ARA&A..11...29M.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 Massarotti, Alessandro et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 23, doi:10.1088/0004-6256/150/3/88, 88, Bibcode: 2015AJ....150...88L.
- ↑ "ups Gem". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Gem.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
- ↑ Bubar, Eric J.; King, Jeremy R. (August 2010), "Spectroscopic Abundances and Membership in the Wolf 630 Moving Group", The Astronomical Journal 140 (2): 293–318, doi:10.1088/0004-6256/140/2/293, Bibcode: 2010AJ....140..293B.
External links
- Kaler, James B. (March 2, 2012), "Upsilon Geminorum", Stars (University of Illinois), http://stars.astro.illinois.edu/sow/upsgem.html, retrieved 2016-12-08.
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