32 Virginis

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

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]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference dr2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Pyper2021 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Mitton1979 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Renson2009 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Bertiau1957 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Kurtz1976 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Douglas1926 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Liakos2017 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Adams1914 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Cannon1915 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Bartolini1972 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Kukarkin1975 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Aurière2010 was invoked but never defined (see the help page).