3 Geminorum

3 Geminorum


Location of 3 Gem (circled)

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]
Mass21 M
Radius36.6 R
Luminosity129,000 L
Surface gravity (log g)2.50 cgs
Temperature18,000 K
Rotational velocity (v sin i)71 km/s
Other designations
3 Geminorum, PU Gem, HR 2173, HIP 29225, HD 42087, BD+23°1226, AAVSO 0603+23
Database references
SIMBADdata

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. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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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