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]

Related Research Articles

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References

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