Wikipedia

32 Virginis

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]

32 Virginis

A light curve for FM Virginis, plotted from TESS data.[1] The 103.51 minute period is marked in red.
Observation data
Epoch J2000.0      Equinox J2000.0
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 mas[2]
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 periastron (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

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

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  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 14 January 2023.
  2. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ a b c 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. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  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. Bibcode:2021PASP..133h4203P. doi:10.1088/1538-3873/ac1ac0. S2CID 237301384.
  5. ^ a b c d 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. Bibcode:1979MNRAS.186..189M. doi:10.1093/mnras/186.2.189. Retrieved 16 January 2023.
  6. ^ a b Renson, P.; Manfroid, J. (May 2009). "Catalogue of Ap, HgMn and Am stars" (PDF). Astronomy and Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788. 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. Bibcode:1957ApJ...125..696B. doi:10.1086/146343. Retrieved 16 January 2023.
  8. ^ a b c d e 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. Bibcode:1976ApJ...207..181K. doi:10.1086/154482.
  9. ^ "d02 Vir -- delta Sct Variable". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-01-15.
  10. ^ Douglas, A. V. (November 1926). "Spectroscopic magnitudes of A-type stars". Astrophysical Journal. 64: 262–270. Bibcode:1926ApJ....64..262D. doi:10.1086/143011. Retrieved 16 January 2023.
  11. ^ a b 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. arXiv:1611.00200. Bibcode:2017MNRAS.465.1181L. doi:10.1093/mnras/stw2756.
  12. ^ Adams, W. S. (December 1914). "Ten Spectroscopic Binaries". Publications of the Astronomical Society of the Pacific. 26 (156): 261. Bibcode:1914PASP...26..261A. doi:10.1086/122362. S2CID 122672368.
  13. ^ Cannon, J. B. (1915). "Orbit of Boss 3323". Publications of the Dominion Observatory Ottawa. 2: 367–384. Bibcode: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. 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. 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.; Roudier, T.; Théado, S. (November 2010). "No detection of large-scale magnetic fields at the surfaces of Am and HgMn stars" (PDF). Astronomy and Astrophysics. 523: A40. arXiv:1008.3086. Bibcode:2010A&A...523A..40A. doi:10.1051/0004-6361/201014848. S2CID 118643022. Retrieved 16 January 2023.
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