Astronomy:SS Virginis

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Short description: Star in the constellation Virgo
SS Virginis
SSVirLightCurve.png
The visual band light curve of SS Virginis, from AAVSO data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Virgo
Right ascension  12h 25m 14.3952s[2]
Declination +00° 46′ 10.9467″[2]
Apparent magnitude (V) 9.5 to 7.4
Characteristics
Spectral type C53e[3]
Astrometry
Radial velocity (Rv)2[4] km/s
Proper motion (μ) RA: −1.448±0.228[2] mas/yr
Dec.: 0.571±0.151[2] mas/yr
Parallax (π)1.4348 ± 0.1018[2] mas
Distance2,300 ± 200 ly
(700 ± 50 pc)
Other designations
SS Vir, HIP 120212, HD 108105, BD+01° 2694, TYC 282-753-1
Database references
SIMBADdata

SS Virginis is a Mira variable star that appears with a strong red hue. It varies in magnitude from a minimum of 9.5 to a maximum of 7.4[5] over a period of 361 days. It is also considered to be a semiregular variable star, as its minimum and maximum magnitude are themselves variable over a period of decades.[6] Its spectral class is C63e. Because it is so rich in carbon, SS Virginis is classified as a carbon star, along with stars like T Geminorum. SS Virginis, like all carbon Mira variables, has a hydrogen-alpha emission line that varies widely, synchronized with the overall variations in light. The hydrogen-alpha emission line becomes far more prominent as the star becomes brighter.[5] Observations made in the near-infrared spectrum indicate that it has a radius of 500 solar radii, and its temperature is between 2405 and 2485 kelvins.[7]

The location of SS Virginis is two degrees north-following of η Virginis (Eta Virginis, Zaniah).

References

Citations
  1. "Download Data". AAVSO. https://www.aavso.org/data-download. 
  2. 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. "V* SS Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+SS+Vir. 
  4. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode1953GCRV..C......0W. 
  5. 5.0 5.1 Mikulášek, Z.; Gráf, T. (2005). "Atlas of Hα emission lines and V light curves of 30 carbon Miras". Astronomical Institute of the Slovak Academy of Sciences 35 (2): 83–106. Bibcode2005CoSka..35...83M. http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?2005CoSka..35...83M&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf. Retrieved 14 July 2012. 
  6. "SS Virginis". American Association of Variable Star Observers. http://www.aavso.org/lcotw/ss-virginis. 
  7. Richichi, A.; Chandrasekhar, T. (1 June 2006). "Near-infrared observations of the carbon stars TU Geminorum and SS Virginis at milliarcsecond resolution". Astronomy and Astrophysics 451 (3): 1041–1044. doi:10.1051/0004-6361:20054669. Bibcode2006A&A...451.1041R. 


References