QS Virginis

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QS Virginis
QSVirLightCurve.png
Visual band light curves for QS Virginis, adapted from O’Donoghue et al. (2003). [1] The lowest plot shows two pre-eclipse dips.
Observation data
Epoch J2000       Equinox J2000
Constellation Virgo
Right ascension 13h 49m 52.0032s [2]
Declination −13° 13 37.0019 [2]
Apparent magnitude  (V)+14.8
Characteristics
Spectral type DAm / M3.5V
Astrometry
Proper motion (μ)RA: 41.618±0.108 [2]   mas/yr
Dec.: 17.984±0.097 [2]   mas/yr
Parallax (π)19.9632 ± 0.0584  mas [2]
Distance 163.4 ± 0.5  ly
(50.1 ± 0.1  pc)
Absolute magnitude  (MV)11.74 + 11.82 [1]
Orbit
Period (P)217.092 min [1]
Semi-major axis (a)0.0056 AU
Eccentricity (e)0.0
Inclination (i)60 [1] °
Details [1]
White dwarf
Mass 0.78  M
Radius 0.011  R
Luminosity 0.0044 [3]   L
Surface gravity (log g)8.34  cgs
Temperature 14,200  K
Rotational velocity (v sin i)400 km/s
Red dwarf
Mass 0.43  M
Radius 0.42  R
Luminosity0.015 [3]   L
Temperature 3,100  K
Rotational velocity (v sin i)140 km/s
Other designations
GSC 05559-00143, 1RXS J134951.0-131338, WD 1347-129, EC 13471-1258, SBC9 1944 [4]
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia
data

QS Virginis (abbreviated QS Vir) is an eclipsing binary system approximately 163 light-years away from the Sun, [1] [2] forming a cataclysmic variable. The system comprises an eclipsing white dwarf and red dwarf that orbit each other every 3.37 hours. [1]

Contents

Variability

The eclipsing binary nature of QS Virginis was discovered in 1997 during the Edinburgh-Cape Blue Object Survey for blue stellar objects in the southern hemisphere. [5]

Possible third body

In 2009 the discovery of an extrasolar planet in orbit around the binary star was announced, detected by variations in the timings of the eclipses of the two stars. [6] The planet was announced to have a minimum mass 6.4 times the mass of Jupiter, in an elliptical orbit 4.2 Astronomical Units away from binary.

Subsequent observations revealed that the timings were not following the pattern predicted by the planetary model. While the observed variations in eclipse times may be caused by a third body, the best fit model orbit is for an object with minimum mass 0.05 solar masses (about 50 times the mass of Jupiter) in a highly eccentric 14-year orbit. [7]

See also

Related Research Articles

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<span class="mw-page-title-main">NSVS 14256825</span> Eclipsing binary star in the constellation Aquila

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<span class="mw-page-title-main">UZ Fornacis</span> Binary star system in the constellation Fornax

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

NY Virginis is a binary star about 1,940 light-years away. The primary belongs to the rare class of subdwarf B stars, being former red giants with their hydrogen envelope completely stripped by a stellar companion. The companion is a red dwarf star. The binary nature of NY Virginis was first identified in 1998, and the extremely short orbital period of 0.101016 d, together with brightness variability on the timescale of 200 seconds was noticed, resulting in the identification of the primary star as a B-type subdwarf in 2003. Under a proposed classification scheme for hot subdwarfs it would be class sdB1VII:He1. This non-standard system indicates that it is a "normal" luminosity for a hot subdwarf and that the spectrum is dominated by hydrogen rather than helium.

<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">AH Virginis</span> Star in the constellation Virgo

AH Virginis is a contact binary star system in the equatorial constellation of Virgo, abbreviated AH Vir. It is a variable star with a brightness that peaks at an apparent visual magnitude of 9.18, making it too faint to be viewed with the naked eye. The distance to this system is approximately 338 light years based on parallax measurements, and it is drifting further away with a mean radial velocity of 7 km/s. O. J. Eggen in 1969 included this system as a probable member of the Wolf 630 group of co-moving stars.

References

  1. 1 2 3 4 5 6 7 O'Donoghue; Koen, C.; Kilkenny, D.; Stobie, R. S.; et al. (2003). "The DA+dMe eclipsing binary EC13471-1258: its cup runneth over ... just". Monthly Notices of the Royal Astronomical Society . 345 (2): 506–528. arXiv: astro-ph/0307144 . Bibcode:2003MNRAS.345..506O. doi:10.1046/j.1365-8711.2003.06973.x. S2CID   17408072.
  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 Calculated from the effective temperature and radius
  4. "QS Vir". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-11-16.
  5. Kilkenny, D.; et al. (1997). "The Edinburgh-Cape Blue Object Survey - II. Zone 1 - the North Galactic CAP". Monthly Notices of the Royal Astronomical Society. 287 (4): 867–893. Bibcode:1997MNRAS.287..867K. doi: 10.1093/mnras/287.4.867 .
  6. Qian, S.-B.; Liao, W.-P.; Zhu, L.-Y.; Dai, Z.-B.; et al. (2009). "A giant planet in orbit around a magnetic-braking hibernating cataclysmic variable". Monthly Notices of the Royal Astronomical Society. 401 (1): L34–L38. Bibcode:2010MNRAS.401L..34Q. doi: 10.1111/j.1745-3933.2009.00780.x .
  7. Parsons, S. G.; Marsh, T. R.; Copperwheat, C. M.; Dhillon, V. S.; et al. (2010). "Orbital Period Variations in Eclipsing Post Common Envelope Binaries". Monthly Notices of the Royal Astronomical Society. 407 (4): 2362–2382. arXiv: 1005.3958 . Bibcode:2010MNRAS.407.2362P. doi:10.1111/j.1365-2966.2010.17063.x. S2CID   96441672.