32 Virginis

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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
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]
Distance 255 ± 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)
Mass 2.05 [5]   M☉
Surface gravity (log g)3.75 [8]   cgs
Temperature 7,450 [8]   K
Rotational velocity (v sin i)24 [8]  km/s
secondary
Mass 1.9 [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
SIMBAD data

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. Retrieved 14 January 2023.
  2. 1 2 3 4 5 6 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. 1 2 3 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. 1 2 3 4 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. 1 2 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. 1 2 3 4 5 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. 1 2 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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