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QS Telescopii

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Binary star system in the constellation Telescopium
QS Telescopii

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

QS Telescopii is a faint, well-studied binary star system in the southern constellation Telescopium. 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. 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.

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

See also

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.; Osborne, J. P.; Watson, M. G. (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. Bibcode:1996MNRAS.280.1121R. doi:10.1093/mnras/280.4.1121. hdl:2381/38963.
  2. ^ 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. ^ Knigge, Christian (December 2006). "The donor stars of cataclysmic variables". Monthly Notices of the Royal Astronomical Society. 373 (2): 484–502. arXiv:astro-ph/0609671. Bibcode:2006MNRAS.373..484K. doi:10.1111/j.1365-2966.2006.11096.x. S2CID 2616606.
  4. ^ 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. arXiv:1103.4575. Bibcode:2011A&A...529A.116T. doi:10.1051/0004-6361/201016352. S2CID 119187792.
  5. ^ 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. Bibcode:2010MNRAS.405..621A. doi:10.1111/j.1365-2966.2010.16487.x.
  6. ^ 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. arXiv:astro-ph/0603097. Bibcode:2006PASP..118..678G. doi:10.1086/503753. S2CID 14857705.
  7. ^ "QS Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-25.

Further reading

  • Romero-Colmenero, E.; et al. (August 2005). Hameury, J.-M.; Lasota, J.-P. (eds.). An eclipsing geometry for the polar QS Tel. The Astrophysics of Cataclysmic Variables and Related Objects, Proceedings of ASP Conference. Vol. 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.; et al. (1996). Evans, A.; Wood, Janet H. (eds.). Recent progress on the polar QS Tel: the HST results. 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. Astrophysics and Space Science Library. Kluwer Academic Publishers. p. 225. Bibcode:1996ASSL..208..225C. doi:10.1007/978-94-009-0325-8_68.
  • 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.; et al. (1995). Buckley, D. A. H.; Warner, B. (eds.). EUVE Spectrophotometry of QS Tel (RE1938-461): The Second Pole Becomes Active. Cape Workshop on Magnetic cataclysmic variables; Proceedings of the Cape Workshop, held in Cape Town, 23-27 January 1995. Astronomical Society of the Pacific Conference Series. Vol. 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. Bibcode:1993ApJ...414L..69W. doi:10.1086/186998.
  • Warren, J. K.; et al. (December 1992). EUVE Observations of the Magnetic Cataclysmic Variable RE1938-461. American Astronomical Society, 181st AAS Meeting. Bulletin of the American Astronomical Society. Vol. 24. p. 1250. Bibcode:1992AAS...181.8007W. 80.07.
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