HD 160529 (V905 Scorpii) is a luminous blue variable (LBV) star located in the constellation of Scorpius. With an apparent magnitude of around +6.8 cannot be seen with the naked eye except under very favourable conditions, but it is easy to see with binoculars or amateur telescopes.
Lluminous blue variable star in the constellation Scorpius
HD 160529
A visual band light curve for V905 Scorpii. The red points are from Sterken et al. (1997),[1] and the blue points are ASAS data.[2]
V905 Sco in comparison to other LBVs and cool hypergiants
V905 Sco has a peculiar variable spectral type with emission lines and P Cygni profiles. At visual maximum it is similar to an A9 star and at minimum close to B8.[5] The distance has been estimated at 2.5 kiloparsecs (8,200 light years) based on the assumption of an absolute magnitude of -8.9.[8] However this distance is uncertain and values between 1.9 kiloparsecs and 3.5 kiloparsecs have been proposed.[5]
Working with a distance of 2.5 kiloparsecs, the radius varies from 150R☉ when quiescent to 330R☉ in outburst. The temperature also varies, from 8,000K in outburst to 12,000K when quiescent. With these parameters, the apparent visual magnitude varies by 0.5 and the bolometric luminosity is constant at 180,000L☉.[5]
Estimates of the surface gravity lead to a mass of 13M☉ and a probable initial mass of 25M☉ This suggests that V905 Sco is a former red supergiant star.[8]
References
Sterken, C.; van Genderen, A. M.; de Groot, M. (January 1997). "Cyclic Light Variations in LBVs". Astronomical Society of the Pacific Conference Series. 120 (Luminous Blue Variables: Massive Stars in Transition): 35. Retrieved 16 March 2022.
Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
Stahl, O.; Gäng, T.; Sterken, C.; Kaufer, A.; Rivinius, T.; Szeifert, T.; Wolf, B. (March 2003). "Long-term spectroscopic monitoring of the Luminous Blue Variable HD 160529". Astronomy and Astrophysics. 400: 279–291. arXiv:astro-ph/0212473. Bibcode:2003A&A...400..279S. doi:10.1051/0004-6361:20021908. S2CID15409946.
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