Astronomy:32 Virginis

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Short description: Variable star in the constellation Virgo
32 Virginis
FMVirLightCurve.png
A light curve for FM Virginis, plotted from TESS data.[1] The 103.51 minute period is marked in red.
Observation data
Equinox J2000.0]] (ICRS)
Constellation Virgo
Right ascension  12h 45m 37.05805s[2]
Declination +07° 40′ 23.9689″[2]
Apparent magnitude (V) 5.20 - 5.28[3]
Characteristics
Spectral type F0 IIIm (primary)[4] + A7V (secondary)[5]
U−B color index +0.15 [6]
B−V color index +0.33[6]
Variable type Delta Scuti[3]
Astrometry
Proper motion (μ) RA: −107.527±0.697[2] mas/yr
Dec.: 4.915±0.344[2] mas/yr
Parallax (π)12.8075 ± 0.3062[2] mas
Distance255 ± 6 ly
(78 ± 2 pc)
Absolute magnitude (MV)+1.75[5]
Orbit[7]
Period (P)38.324 d
Eccentricity (e)0.074±0.006
Periastron epoch (T)2434039.463±0.038
Argument of periapsis (ω)
(primary)		210.02±5.1°
Semi-amplitude (K1)
(primary)		48.05±0.33 km/s
Details
primary (Delta Scuti variable)
Mass2.05[5] M☉
Surface gravity (log g)3.75[8] cgs
Temperature7,450[8] K
Rotational velocity (v sin i)24[8] km/s
secondary
Mass1.9[5] M☉
Rotational velocity (v sin i)140[8] km/s
Other designations
FM Vir, d2 Virginis, HD 110951, BD+08 2639, HIP 62267, HR 4847, SAO 119574,[9] Boss 3323[10]
Database references
SIMBADdata

32 Virginis, also known as FM Virginis, is a star located about 250 light years from the Earth, in the constellation Virgo.[2] Its apparent magnitude ranges from 5.20 to 5.28, making it faintly visible to the naked eye of an observer well away from city lights.[3] 32 Virginis is a binary star,[11] and the more massive component of the binary is a Delta Scuti variable star which oscillates with a dominant period of 103.51 minutes.[11]

In 1914, Walter Sydney Adams announced that 32 Virginis is a spectroscopic binary.[12] John Beattie Cannon published the first set of orbital elements for the binary system in 1915.[13] Corrado Bartolini et al. made photometric observations of the star in early 1971, and found that the star showed variability due to pulsations.[14] In 1974, 32 Virginis was given the variable star designation FM Virginis.[15] Donald Kurtz et al. determined that the star was a Delta Scuti variable, in 1976.[8]

The primary star is believed to be an Am star similar to rho Puppis - a pulsating post-main sequence star.[16]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  4. ↑ Pyper, Diane M.; Adelman, Saul J. (August 2021). "Light Curve Changes and Possible Precession in mCP Stars". Publications of the Astronomical Society of the Pacific 133 (1026): 084203. doi:10.1088/1538-3873/ac1ac0. Bibcode: 2021PASP..133h4203P. 
  5. ↑ 5.0 5.1 5.2 5.3 Mitton, J.; Stickland, D. J. (January 1979). "The nature of the components of the spectroscopic binary, 32 Virginis". Monthly Notices of the Royal Astronomical Society 186 (2): 189–195. doi:10.1093/mnras/186.2.189. Bibcode: 1979MNRAS.186..189M. https://academic.oup.com/mnras/article/186/2/189/993968. Retrieved 16 January 2023. 
  6. ↑ 6.0 6.1 Renson, P.; Manfroid, J. (May 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics 498 (3): 961–966. doi:10.1051/0004-6361/200810788. Bibcode: 2009A&A...498..961R. https://www.aanda.org/articles/aa/pdf/2009/18/aa10788-08.pdf. Retrieved 16 January 2023. 
  7. ↑ Bertiau, F. C. (May 1957). "The Orbits of the Spectroscopic Binaries Rho Orionis, Eta Bootis, and 32 Virginis". Astrophysical Journal 125: 696. doi:10.1086/146343. Bibcode: 1957ApJ...125..696B. https://articles.adsabs.harvard.edu/pdf/1957ApJ...125..696B. Retrieved 16 January 2023. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 Kurtz, D. W.; Breger, M.; Evans, S. W.; Sandmann, W. H. (July 1976). "Metallicism, pulsation, and the nature of 32 Virginis". Astrophysical Journal 207: 181–189. doi:10.1086/154482. Bibcode: 1976ApJ...207..181K. 
  9. ↑ "d02 Vir -- delta Sct Variable". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=d02+Vir+--+delta+Sct+Variable. 
  10. ↑ Douglas, A. V. (November 1926). "Spectroscopic magnitudes of A-type stars". Astrophysical Journal 64: 262–270. doi:10.1086/143011. Bibcode: 1926ApJ....64..262D. https://ui.adsabs.harvard.edu/abs/1926ApJ....64..262D. Retrieved 16 January 2023. 
  11. ↑ 11.0 11.1 Liakos, Alexios; Niarchos, Panagiotis (February 2017). "Catalogue and properties of δ Scuti stars in binaries". Monthly Notices of the Royal Astronomical Society 465 (1): 1181–1200. doi:10.1093/mnras/stw2756. Bibcode: 2017MNRAS.465.1181L. https://ui.adsabs.harvard.edu/abs/2017MNRAS.465.1181L. Retrieved 16 January 2023. 
  12. ↑ Adams, W. S. (December 1914). "Ten Spectroscopic Binaries". Publications of the Astronomical Society of the Pacific 26 (156): 261. doi:10.1086/122362. Bibcode: 1914PASP...26..261A. 
  13. ↑ Cannon, J. B. (1915). "Orbit of Boss 3323". Publications of the Dominion Observatory Ottawa 2: 367–384. Bibcode: 1915PDO.....2..367C. https://ui.adsabs.harvard.edu/abs/1915PDO.....2..367C. Retrieved 16 January 2023. 
  14. ↑ Bartolini, C.; Grilli, F.; Parmeggiani, G. (August 1972). "32 Virginis: a pulsating Am star". Information Bulletin on Variable Stars 704 (1): 1. Bibcode: 1972IBVS..704....1B. https://ui.adsabs.harvard.edu/abs/1972IBVS..704....1B. Retrieved 16 January 2023. 
  15. ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (January 1975). "60th Name-List of Variable Stars". Information Bulletin on Variable Stars 961 (1): 1. Bibcode: 1975IBVS..961....1K. https://ui.adsabs.harvard.edu/abs/1975IBVS..961....1K. Retrieved 16 January 2023. 
  16. ↑ Aurière, M.; Wade, G. A.; Lignières, F.; Hui-Bon-Hoa, A.; Landstreet, J. D.; Iliev, I. Kh.; Donati, J. F.; Petit, P. et al. (November 2010). "No detection of large-scale magnetic fields at the surfaces of Am and HgMn stars". Astronomy and Astrophysics 523: A40. doi:10.1051/0004-6361/201014848. Bibcode: 2010A&A...523A..40A. https://www.aanda.org/articles/aa/pdf/2010/15/aa14848-10.pdf. Retrieved 16 January 2023. 



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