Astronomy:Nu Virginis

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Short description: Variable star in the constellation Virgo
ν Virginis
Virgo constellation map.svg
Red circle.svg
Location of ν Virginis (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Virgo
Right ascension  11h 45m 51.55957s[1]
Declination +06° 31′ 45.7413″[1]
Apparent magnitude (V) 4.04[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type M1 III[4]
U−B color index +1.80[2]
B−V color index +1.52[2]
Astrometry
Radial velocity (Rv)50.19±0.30[5] km/s
Proper motion (μ) RA: −18.96[1] mas/yr
Dec.: −181.56[1] mas/yr
Parallax (π)11.10 ± 0.18[1] mas
Distance294 ± 5 ly
(90 ± 1 pc)
Absolute magnitude (MV)−0.87[6]
Details
Mass1.6[7] M☉
Radius54[5] R☉
Luminosity631[5] L☉
Surface gravity (log g)1.0[5] cgs
Temperature4,009[5] K
Metallicity [Fe/H]0.06[5] dex
Rotational velocity (v sin i)3.8[5] km/s
Other designations
ν Vir, 3 Virginis, BD+07°2479, FK5 1302, HD 102212, HIP 57380, HR 4517, SAO 119035[8]
Database references
SIMBADdata

ν Virginis, Latinized as Nu Virginis, is a single[9] star in the zodiac constellation of Virgo, located at the western tip of the classic constellation and nearly due south of the prominent star Denebola.[10] It is a red-hued star with an apparent visual magnitude of 4.04[2] and can be seen with the naked eye. Because the star lies near the ecliptic it is subject to occultations by the Moon.[11] Parallax measurements provide an estimated distance of around 294 light years from the Sun,[1] and it is drifting further away with a radial velocity of +50 km/s.[5]

A light curve for Nu Virginis, plotted from Hipparcos data[12]

This object is an M-type red giant, currently on the asymptotic giant branch,[3] with a stellar classification of M1 III.[4] It is an SRB-type[13] semiregular variable star with its brightness varying by 0.0125 in magnitude.[14] These variations have four periods lasting 11.1, 12.3, 16.8, and 23.7 days.[15] This star has about 1.6 times the mass of the sun, but it has expanded to 54 times the Sun's radius and shines 631 times as brightly as the Sun. The effective temperature of its outer atmosphere is 4,009 K.[7]

References

  1. ↑ 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. ↑ 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. ↑ 3.0 3.1 Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal 104 (1): 275–313, doi:10.1086/116239, Bibcode: 1992AJ....104..275E. 
  4. ↑ 4.0 4.1 Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics 11: 29–50, doi:10.1146/annurev.aa.11.090173.000333, Bibcode: 1973ARA&A..11...29M. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 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. 
  6. ↑ Pace, G. et al. (April 2003), "The Wilson-Bappu effect: A tool to determine stellar distances", Astronomy and Astrophysics 401 (3): 997–1007, doi:10.1051/0004-6361:20030163, Bibcode: 2003A&A...401..997P. 
  7. ↑ 7.0 7.1 Tsuji, Takashi (May 2007). Kupka, F.; Roxburgh, I.; Chan, K.. eds. "Isotopic abundances of Carbon and Oxygen in Oxygen-rich giant stars". Proceedings of the International Astronomical Union (Convection in Astrophysics, Proceedings of IAU Symposium #239, Prague, Czech Republic) 2: 307–310. 21–25 August 2006. doi:10.1017/S1743921307000622. Bibcode: 2007IAUS..239..307T. 
  8. ↑ "* nu. Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+nu.+Vir. 
  9. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  10. ↑ Kaler, James B., "Nu Virginis", STARS, http://stars.astro.illinois.edu/sow/nuvir.html, retrieved 2019-10-06. 
  11. ↑ White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal 94: 751, doi:10.1086/114513, Bibcode: 1987AJ.....94..751W. 
  12. ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. 
  13. ↑ Kazarovets, E. V. et al. (1999), "The 74th Special Name-list of Variable Stars", Information Bulletin on Variable Stars 4659 (4659): 1, Bibcode: 1999IBVS.4659....1K. 
  14. ↑ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45–59. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K. 
  15. ↑ Tabur, V. et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society 400 (4): 1945–1961, doi:10.1111/j.1365-2966.2009.15588.x, Bibcode: 2009MNRAS.400.1945T. 



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