Astronomy:QS Telescopii

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Short description: Binary star system in the constellation Telescopium
QS Telescopii
QSTelLightCurve.png
A visual band light curve for QS Telescopii, adapted from Rosen et al. (1996)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Telescopium
Right ascension  19h 38m 35.816s[2]
Declination −46° 12′ 57.11″[2]
Characteristics
Spectral type M4.5±0.5[3]
Variable type AM Her[4]
Astrometry
Radial velocity (Rv)110 km/s
Proper motion (μ) RA: +35.150[2] mas/yr
Dec.: −25.496[2] mas/yr
Parallax (π)5.3378 ± 0.0834[2] mas
Distance611 ± 10 ly
(187 ± 3 pc)
Orbit[5]
Period (P)2.33 h
Eccentricity (e)0.0
Details
White Dwarf
Mass0.71[6] M☉
Temperature17,500[6] K
Other designations
QS Tel, EUVE J1938-46.2, RE 1938-461, AAVSO 1931-46[7]
Database references
SIMBADdata

QS Telescopii is a faint, well-studied[4] binary star system in the southern constellation Telescopium.[7] It is composed of a white dwarf and main sequence donor star, locked into a close, circular orbit facing one another. Known as polars, material from the donor star does not form an accretion disk around the white dwarf, but rather streams directly onto it.[6] This is due to the presence of the white dwarf's strong magnetic field. The pair undergo frequent shifts between a high and low accretion states, and it shifts between single and double accretion poles. The main pole is partially self-eclipsing.[4]

The pair orbit each other with a period of 2.33[5] hours in a circular orbit. The donor star is a small red dwarf with an estimated stellar classification of M4−5.[3] The white dwarf primary has 71% of the mass of the Sun and an effective temperature of 17,500 K.[6] It has a magnetic field strength of 50–80 MG. The system is a source for X-ray emission.[4]

See also

  • Variable stars
  • Polar (cataclysmic variable)
  • AM Herculis

References

  1. ↑ Rosen, S. R.; Mittaz, J. P. D.; Buckley, D. A.; Layden, A. C.; Clayton, K. L.; McCain, C.; Wynn, G. A.; Sirk, M. M. et al. (June 1996). "Accretion mode changes in QS Tel (RE 1938 — 461): EUVE, ROSAT and optical observations". Monthly Notices of the Royal Astronomical Society 280 (4): 1121–1142. doi:10.1093/mnras/280.4.1121. Bibcode: 1996MNRAS.280.1121R. 
  2. ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 Knigge, Christian (December 2006). "The donor stars of cataclysmic variables". Monthly Notices of the Royal Astronomical Society 373 (2): 484–502. doi:10.1111/j.1365-2966.2006.11096.x. Bibcode: 2006MNRAS.373..484K. 
  4. ↑ 4.0 4.1 4.2 4.3 Traulsen, I.; Reinsch, K.; Schwope, A. D.; Burwitz, V. et al. (2011). "XMM-Newton observations of the X-ray soft polar QS Telescopii". Astronomy and Astrophysics 529 (A116): 7. doi:10.1051/0004-6361/201016352. Bibcode: 2011A&A...529A.116T. 
  5. ↑ 5.0 5.1 Augusteijn, T. et al. (June 2010). "Cataclysmic variables from the Calán-Tololo Survey - II. Spectroscopic periods". Monthly Notices of the Royal Astronomical Society 405 (1): 621–637. doi:10.1111/j.1365-2966.2010.16487.x. Bibcode: 2010MNRAS.405..621A. 
  6. ↑ 6.0 6.1 6.2 6.3 Gerke, Jill R. et al. (2006). "Polars Changing State: Multiwavelength Long‐Term Photometry and Spectroscopy of QS Telescopii, V834 Centauri, and BL Hydri". Publications of the Astronomical Society of the Pacific 118 (843): 678–86. doi:10.1086/503753. Bibcode: 2006PASP..118..678G. 
  7. ↑ 7.0 7.1 "QS Tel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=QS+Tel. 

Further reading

  • Romero-Colmenero, E.; Potter, S. B.; Buckley, D. A. H. (August 2005). "An eclipsing geometry for the polar QS Tel". in Hameury, J.-M.; Lasota, J.-P.. The Astrophysics of Cataclysmic Variables and Related Objects, Proceedings of ASP Conference. 330. San Francisco: Astronomical Society of the Pacific. p. 429. Bibcode: 2005ASPC..330..429R. 
  • de Martino, D. et al. (January 1998). "Insights into the accretion flow in QS Telescopii (RE1938-461) from HST observations". Astronomy and Astrophysics 329: 571–578. Bibcode: 1998A&A...329..571D. 
  • Clayton, K. L.; Rosen, S. R.; Osborne, J. P. (1996). "Recent progress on the polar QS Tel: the HST results". in Evans, A.; Wood, Janet H.. Cataclysmic variables and related objects. Proceedings of the 158th colloquium of the International Astronomical Union (IAU); held at Keele; United Kingdom; June 26-30; 1995; Dordrecht. Kluwer Academic Publishers. p. 225. doi:10.1007/978-94-009-0325-8_68. Bibcode: 1996ASSL..208..225C. 
  • de Martino, D.; Buckely, D. A. H.; Mouchet, M.; Mukai, K. (June 1995). "UV observations of the polar system RE 1938-461". Astronomy and Astrophysics 298: L5. Bibcode: 1995A&A...298L...5D. 
  • Rosen, S.; Mittaz, J.; Buckley, D. A. H.; Layden, A.; McCain, C. (1995). "EUVE Spectrophotometry of QS Tel (RE1938-461): The Second Pole Becomes Active". in Buckley, D. A. H.; Warner, B.. Cape Workshop on Magnetic cataclysmic variables; Proceedings of the Cape Workshop, held in Cape Town, 23-27 January 1995. 85. San Francisco: Astronomical Society of the Pacific. p. 279. Bibcode: 1995ASPC...85..279R. 
  • Schwope, A. D. et al. (January 1995). "Two-pole accretion in the high-field polar RXJ 1938.6-4612.". Astronomy and Astrophysics 293: 764–776. Bibcode: 1995A&A...293..764S. 
  • Warren, John K. et al. (September 1993). "Extreme Ultraviolet Explorer Observations of the Magnetic Cataclysmic Variable RE 1938-461". Astrophysical Journal Letters 414: L69. doi:10.1086/186998. Bibcode: 1993ApJ...414L..69W. 
  • Warren, J. K.; Vallerga, J. V.; Mauche, C. W.; Mukai, K.; Siegmund, O. H. W. (December 1992). "EUVE Observations of the Magnetic Cataclysmic Variable RE1938-461". American Astronomical Society, 181st AAS Meeting. 24. 1250. 80.07. Bibcode: 1992AAS...181.8007W. 




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