W Virginis

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W Virginis
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 13h 26m 01.99307s[1]
Declination −03° 22′ 43.4164″[1]
Apparent magnitude (V) 9.46[1]
Characteristics
Spectral type F0Ib...[1]
B−V color index 0.87[1]
V−R color index 0.17[1]
R−I color index −0.10[1]
Variable type W Virginis[2]
Astrometry
Radial velocity (Rv) −65.5[1] km/s
Proper motion (μ) RA: −3.73 ± 1.25[3] mas/yr
Dec.: 2.73 ± 0.62[3] mas/yr
Parallax (π) −3.32 ± 1.18[3] mas
Other designations
HIP 65531, SAO 139335, BD-02° 3683, HD 116802.[1]
Database references
SIMBAD data

W Virginis is the prototype W Virginis variable, a subclass of Cepheid variables. Located in the constellation Virgo, It ranges between magnitudes 9.46 and 10.75 over a period of approximately 17 days.[2] There are variations in the light curve apparently due to multiple pulsation periods rather than inherent instabilities in the pulsation. The dominant pulsation mode has a period of 17.27134 days with a period decrease detected over a 75-year period.[4]

References[edit]

  1. ^ a b c d e f g h i "W Virginis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 28 September 2014. 
  2. ^ a b VSX; Otero, S. A. (21 October 2013). "W Virginis". AAVSO Website. American Association of Variable Star Observers. Retrieved 28 September 2014. 
  3. ^ a b c van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  4. ^ Templeton, M. R.; Henden, A. A. (2007). "Multicolor Photometry of the Type II Cepheid Prototype W Virginis". The Astronomical Journal 174 (5): 1999–2005. arXiv:0709.0401. Bibcode:2007AJ....134.1999T. doi:10.1086/522945.