astro.wikisort.org - StarQV Normae, also known as Norma X-2, is a high mass X-ray binary star system in the constellation Norma. It varies between apparent magnitudes of 16.19 and 16.31.[2]
Star in the constellation Norma
QV Normae
Observation data Epoch J2000.0 ICRS Equinox J2000.0 ICRS |
Constellation |
Norma |
Right ascension |
15h 42m 23.36s[1] |
Declination |
−52° 23′ 09.6″ [1] |
Apparent magnitude (V) |
16.19 - 16.31 [2] |
Characteristics |
Spectral type |
B0Iabe[2] |
Other designations |
---|
Norma X-2 |
Database references |
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SIMBAD | data |
The X-ray source was first identified in the early 1970s.[3] The nature of the system was discovered in 1978 by astronomers who aligned a visual source of a reddened hot blue-white star with the X-ray source 4U 1538 - 52. The components are a blue-white supergiant estimated to have a mass around 20 times that of the Sun and a neutron star initially estimated at around 1.4 solar masses,[4] later revised to 0.8 solar masses. The stellar wind from the more massive star is drawn to the magnetic poles of neutron star, forming an accretion column and producing X-rays. The system has been estimated to lie anywhere from 4500 to 6500 parsecs (15,000-20,000 light-years) from Earth.[3]
References
- "V* QV Normae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 May 2015.
- Otero, Sebastian Alberto (23 May 2011). "V QV Nor". The International Variable Star Index. Retrieved 20 May 2015.
- Hemphill, Paul B.; Rothschild, Richard E.; Markowitz, Alex; Fürst, Felix; Pottschmidt, Katja; Wilms, Jörn (2014). "A Clumpy Stellar Wind and Luminosity-dependent Cyclotron Line Revealed by the First Suzaku Observation of the High-mass X-Ray Binary 4U 1538-522". The Astrophysical Journal. 792 (1): 15. arXiv:1407.1028. Bibcode:2014ApJ...792...14H. doi:10.1088/0004-637X/792/1/14. S2CID 28693293.
- Reynolds, A. P.; Bell, S. A.; Hilditch, R. W. (1992). "Optical spectroscopy of the massive X-ray binary QV Nor (4U 1538 - 52)". Monthly Notices of the Royal Astronomical Society. 256 (4): 631–40. Bibcode:1992MNRAS.256..631R. doi:10.1093/mnras/256.4.631. ISSN 0035-8711.
Constellation of Norma |
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|
Stars | Bayer | |
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Variable | |
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HR |
- 5798
- 5803
- 5832
- 5836
- 5865
- 5869
- 5871
- 5872
- 5882
- 5900
- 5921
- 5937
- 5946
- 5979
- 6040
- 6049
- 6059
- 6473
- 6083
- 6085
- 6099
- 6114
|
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HD | |
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Other | |
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 Category |
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