3 Geminorum
 
| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 09m 43.98481s[1] |
| Declination | +23° 06′ 48.4677″[1] |
| Apparent magnitude (V) | 5.75[2] |
| Characteristics | |
| Spectral type | B2.5 Ib[3] |
| U−B color index | −0.63[2] |
| B−V color index | +0.21[2] |
| Variable type | α Cyg[4] |
| Astrometry | |
| Radial velocity (Rv) | 16.00 ± 4.3[5] km/s |
| Proper motion (μ) | RA: −0.92 ± 0.75[1] mas/yr Dec.: −2.65 ± 0.49[1] mas/yr |
| Parallax (π) | 0.23 ± 0.88[1] mas |
| Absolute magnitude (MV) | −6.26[6] |
| Details[6] | |
| Mass | 21 M☉ |
| Radius | 36.6 R☉ |
| Luminosity | 129,000 L☉ |
| Surface gravity (log g) | 2.50 cgs |
| Temperature | 18,000 K |
| Rotational velocity (v sin i) | 71 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
3 Geminorum is a blue supergiant star in the constellation Gemini. It was found to be an Alpha Cygni variable in 1998. It varies by a few tenths of a magnitude[4] with a main period of 3.81 days.[7]
References
- 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 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.
- ↑ Prinja, R. K.; Massa, D. L. (2010). "Signature of wide-spread clumping in B supergiant winds". Astronomy and Astrophysics 521: L55. arXiv:1007.2744. Bibcode:2010A&A...521L..55P. doi:10.1051/0004-6361/201015252.
- 1 2 Samus, N. N.; Durlevich, O. V.; 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.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- 1 2 Searle, S. C.; Prinja, R. K.; Massa, D.; Ryans, R. (2008). "Quantitative studies of the optical and UV spectra of Galactic early B supergiants. I. Fundamental parameters". Astronomy and Astrophysics 481 (3): 777. arXiv:0801.4289. Bibcode:2008A&A...481..777S. doi:10.1051/0004-6361:20077125.
- ↑ Waelkens, C.; Aerts, C.; Kestens, E.; Grenon, M.; Eyer, L. (1998). "Study of an unbiased sample of B stars observed with Hipparcos: the discovery of a large amount of new slowly pulsating B star". Astronomy and Astrophysics 330: 215–21. Bibcode:1998A&A...330..215W.
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