QS Virginis

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

QS Virginis
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension  13h 49m 52.0032s[1]
Declination −13° 13′ 37.0019″[1]
Apparent magnitude (V) +14.8
Characteristics
Spectral type DAm / M3.5V
Astrometry
Proper motion (μ) RA: 41.618±0.108[1] mas/yr
Dec.: 17.984±0.097[1] mas/yr
Parallax (π)19.9632 ± 0.0584[1] mas
Distance163.4 ± 0.5 ly
(50.1 ± 0.1 pc)
Absolute magnitude (MV)11.74 + 11.82[2]
Orbit
Period (P)217.092 min[2]
Semi-major axis (a)0.0056 AU
Eccentricity (e)0.0
Inclination (i)60[2]°
Details[2]
White dwarf
Mass0.78 M☉
Radius0.011 R☉
Luminosity0.0044[3] L☉
Surface gravity (log g)8.34 cgs
Temperature14,200 K
Rotational velocity (v sin i)400 km/s
Red dwarf
Mass0.43 M☉
Radius0.42 R☉
Luminosity0.015[3] L☉
Temperature3,100 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
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

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]

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See also

References
  1. 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.
  2. 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.
  3. 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.

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