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QZ Carinae

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QZ Carinae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h44m22.9s [1]
Declination −59°59′35.9550″[1]
Apparent magnitude (V) 6.16 - 6.49[2]
Distance2300 pc
Spectral typeO9.7I+ B2V, O8 III+O9V[3]
Other designations
HD 93206, HIP 52526

QZ Carinae is a multiple star in the constellation Carina. It is approximately 2300 parsecs (7500 light-years) from Earth.[3] A Beta Lyrae variable eclipsing system, its apparent magnitude ranging from +6.16 to +6.49 with a period of 5.9 days.[2] Stars of this brightness are just visible to the unaided eye in semi-rural settings on the edges of cities.[4] It was first noted to be variable in 1972 by observers in Auckland.[5]

Located in the Greater Carina nebula, the star system is composed of two star pairs in close orbit designated A1 and A2, and B1 and B2. The two pairs orbit each other every 25 years, while the A pair completes an orbit around each other every 20.7 days and the B pair stars every 6 days. QZ Carinae A1 is a blue supergiant of spectral type O9.7I with around 40 times the Sun's mass that has expanded to 22.5 times the Sun's radius. With a surface temperature of 32000 K, it is around 500,000 times as luminous as our Sun. Its partner A2 is a blue-white main sequence star spectral type B2V with around 10 times the Sun's mass and 6 times its radius. With a surface temperature of 20000 K, it is around 5,000 times as luminous as our Sun. QZ Carinae B1 is a hot blue giant that has expanded and cooled off the main sequence; it is of spectral type O8III with around 14.1 times the Sun's mass and 26.9 times its radius. With a surface temperature of 32573 K, it is around 200,000 times as luminous as our Sun. Partner B2 is a hot main sequence star of spectral type O9V with around 28 times the Sun's mass and 8.9 times its radius. With a surface temperature of 32463 K, it is around 80,000 times as luminous as our Sun.[3] Together, all four stars have a combined mass 94 times that of the Sun.[5]

References

  1. ^ a b "QZ Carinae". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 12 March 2014.
  2. ^ a b Watson, Christopher (4 January 2010). "QZ Carinae". AAVSO Website. American Association of Variable Star Observers. Retrieved 12 March 2014.
  3. ^ a b c Parkin, E. R.; Broos, P. S.; Townsley, L. K.; Pittard, J. M.; Moffat, A. F. J.; Nazé, Y.; Rauw, G.; Oskinova, L. M.; Waldron, W. L. (2011). "X-ray emission from the double-binary OB-star system QZ Car (HD 93206)". The Astrophysical Journal Supplement. 194 (1): article id. 8, 11 pp. arXiv:1103.0794. Bibcode:2011ApJS..194....8P. doi:10.1088/0067-0049/194/1/8.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Retrieved 20 February 2013.
  5. ^ a b Walker, Stan (26 October 2013). "QZ Carinae Project: Introduction - A Review of the System". Variable Stars South. Royal Astronomical Society of New Zealand. Retrieved 12 March 2014.


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