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

<span class="mw-page-title-main">Delta Scuti</span> Star in the constellation Scutum

Delta Scuti, Latinized from δ Scuti, is a variable star in the southern constellation Scutum. With an apparent visual magnitude that fluctuates around 4.72, it is the fifth-brightest star in this small and otherwise undistinguished constellation. Analysis of the parallax measurements place this star at a distance of about 199 light-years from Earth. It is drifting closer with a radial velocity of −45 km/s.

<span class="mw-page-title-main">Theta Tauri</span> Binary star in the constellation Taurus

Theta Tauri is a wide double star in the constellation of Taurus and a member of the Hyades open cluster.

<span class="mw-page-title-main">RV Tauri variable</span> Class of luminous variable star

RV Tauri variables are luminous variable stars that have distinctive light variations with alternating deep and shallow minima.

<span class="mw-page-title-main">Omega Virginis</span> Star in the constellation Virgo

Omega Virginis is a solitary star in the zodiac constellation Virgo. It has an apparent visual magnitude of +5.2, which is bright enough to be faintly visible to the naked eye. Based upon an annual stellar parallax shift of 6.56 milliarcseconds, it is located about 500 light years from the Sun.

<span class="mw-page-title-main">14 Aurigae</span> Quadruple star system in the constellation Auriga

14 Aurigae is a quadruple star system located 269 light years away from the Sun in the zodiac constellation of Auriga. It has the variable star designation KW Aurigae, whereas 14 Aurigae is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 5.01. The system is moving closer to the Sun with a heliocentric radial velocity of −9 km/s.

<span class="mw-page-title-main">Kappa Boötis</span> Double star in the constellation of Boötes

Kappa Boötis is a double star in the constellation Boötes. It has the traditional name Asellus Tertius and the Flamsteed designation 17 Boötis. The components are separated by an angular distance of 13.5 arcsec, viewable in a small telescope. Kappa Boötis is approximately 155 light years from Earth.

<span class="mw-page-title-main">4 Canum Venaticorum</span> Binary star system in the constellation Canes Venatici

4 Canum Venaticorum is a binary star system in the northern constellation of Canes Venatici, located around 425 light years away. It has the variable star designation AI Canum Venaticorum; 4 Canum Venaticorum is its Flamsteed designation. Its brightness varies from magnitude +5.89 to +6.15 with a period of 2.8 hours, which places it around the lower limit of visibility to the naked eye. This was found to be a binary by Schmid et al. in 2014, based on periodic, non-sinusoidal changes in its radial velocity. It is a single-lined spectroscopic binary with an orbital period of 124.4 days and an eccentricity of 0.31.

<span class="mw-page-title-main">Pi Cassiopeiae</span> Variable star in the constellation Cassiopeia

Pi Cassiopeiae, Latinized from π Cassiopeiae, is a close binary star system in the constellation Cassiopeia. It is visible to the naked eye with an apparent visual magnitude of +4.949. Based upon an annual parallax shift of 18.63 mas as seen from Earth, this system is located about 175 light years from the Sun.

3 Centauri is a triple star system in the southern constellation of Centaurus, located approximately 300 light years from the Sun. It is visible to the naked eye as a faint, blue-white hued star with a combined apparent visual magnitude of 4.32. As of 2017, the two visible components had an angular separation of 7.851″ along a position angle of 106°. The system has the Bayer designation k Centauri; 3 Centauri is the Flamsteed designation. It is a suspected eclipsing binary with a variable star designation V983 Centauri.

<span class="mw-page-title-main">101 Virginis</span> Star in the constellation Boötes

101 Virginis is a red giant variable star in the Boötes constellation, currently on the asymptotic giant branch. It was originally catalogued as 101 Virginis by Flamsteed due to an error in the position. When it was confirmed as a variable star, it was actually within the border of the constellation Bootes and given the name CY Boötis.

38 Geminorum is a binary star system in the northern zodiac constellation of Gemini. It has the Bayer designation e Geminorum, while 38 Geminorum is the Flamsteed designation. This system is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.71. The primary component is a magnitude 4.75 star, while the secondary is magnitude 7.80. The system is located about 98 light years away from the Sun based on parallax, and is drifting further away with a radial velocity of +16 km/s. It is a potential member of the Tucana–Horologium stellar kinematic group.

16 Serpentis is a binary star system in the Serpens Caput portion of the equatorial constellation of Serpens, located 228 light years from the Sun. It is visible to the naked eye as a fain, orange-hued star with an apparent visual magnitude of 5.261. The system is moving further from the Earth with a heliocentric radial velocity of +3 km/s.

<span class="mw-page-title-main">HD 125248</span> Binary star system in the constellation of Virgo

HD 125248 is a binary star system in the equatorial constellation of Virgo. It has the variable star designation CS Virginis, while HD 125248 is the designation from the Henry Draper Catalogue. This system is dimly visible to the naked eye as a point of light with an apparent visual magnitude that ranges from 5.84 down to 5.95. It is located at a distance of approximately 280 light years from the Sun based on parallax measurements, but is drifting closer with a heliocentric radial velocity of −8 km/s.

<span class="mw-page-title-main">AG Virginis</span> Eclipsing binary star in the constellation Virgo

AG Virginis is an eclipsing binary star system in the equatorial constellation of Virgo. With a maximum apparent visual magnitude of 8.51 it is too faint to be visible to the naked eye. The system is located at a distance of approximately 820 light years from the Sun based on parallax measurements.

<span class="mw-page-title-main">BH Virginis</span> Eclipsing binary star in the constellation Virgo

BH Virginis is a binary star system in the equatorial constellation of Virgo. With a typical apparent visual magnitude of 9.6, it is too faint to be visible to the naked eye. Based on parallax measurements, it is located at a distance of approximately 488 light years from the Sun. The system is drifting closer with a net radial velocity of −23 km/s.

<span class="mw-page-title-main">FG Virginis</span> Variable star in the constellation Virgo

FG Virginis is a well-studied variable star in the equatorial constellation of Virgo. It is a dim star, near the lower limit of visibility to the naked eye, with an apparent visual magnitude that ranges from 6.53 down to 6.58. The star is located at a distance of 273.5 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +16 km/s. Because of its position near the ecliptic, it is subject to lunar occultations.

<span class="mw-page-title-main">RR Lyncis</span> Variable star in the constellation Lynx

RR Lyncis is a star system in the northern constellation of Lynx, abbreviated RR Lyn. It is an eclipsing binary of the Algol type; one of the closest in the northern sky at an estimated distance of approximately 263 light years based on parallax measurements. The system is faintly visible to the naked eye with a combined apparent visual magnitude of 5.53. During the primary eclipse the brightness drops to 6.03, while it decreases to magnitude 5.90 with the secondary eclipse. The system is drifting closer to the Sun with a radial velocity of −12 km/s.

<span class="mw-page-title-main">VZ Cancri</span> Variable star in the constellation Cancer

VZ Cancri is a variable star in the constellation Cancer, abbreviated VZ Cnc. It varies in brightness with a period of 0.178364 days, from an apparent visual magnitude of 7.18 down to 7.91, which lies below the typical threshold of visibility for the naked eye. The distance to this star is approximately 724 light years based on parallax measurements, and it is receding from the Sun with a radial velocity of 25 km/s.

<span class="mw-page-title-main">HD 40372</span> Variable star in the constellation Orion

HD 40372, also known as 59 Orionis, V1004 Orionis and HR 2100, is a variable star in the constellation Orion. Its apparent magnitude varies between magnitude 5.88 and 5.92, making it faintly visible to the naked eye for an observer far from light polluted urban areas. HD 40372 exhibits two types of variability; it is an eclipsing binary star and one of the two stars is a Delta Scuti variable star.

<span class="mw-page-title-main">57 Tauri</span> Variable star in the constellation Taurus

57 Tauri, also known as h Tauri and V483 Tauri, is a star 148 light years from the Earth, in the constellation Taurus. It is a 5th magnitude star, so it will be visible to the naked eye of an observer located far from city lights. 57 Tauri is a member of the Hyades star cluster. It is a Delta Scuti variable star, whose brightness changes slightly, ranging from magnitude 5.55 to 5.59.

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 . Retrieved 16 January 2023.
  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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