HD 160529 (V905 Sco) is a bright blue variable star located in the constellation Scorpio . With a visible magnitude of +6.8 m, it is not available for observation with the naked eye, with the exception of extremely good observation conditions, but it can be seen with binoculars or an amateur telescope .
| HD 160529 | |||
|---|---|---|---|
| Star | |||
| Observational data ( Epoch J2000.0 ) | |||
| Right ascension | 17 h 41 m 59.025 s | ||
| Declination | -33 ° 30 ′ 13.71 ″ | ||
| Distance | 2,500 [1] | ||
| Visible magnitude ( V ) | 6.66 [2] (6.3 - 6.9 [3] ) | ||
| Constellation | Scorpio | ||
| Astrometry | |||
| Radial velocity ( R v ) | -35 [4] km / s | ||
| Proper motion (μ) | RA: −1.75 [5] mas per year Dec: −1.49 [5] mas per year | ||
| Parallax (π) | 0.54 ± 0.54 [5] mas | ||
| Absolute magnitude (V) | -8.9 [6] | ||
| Specifications | |||
| Spectral class | Lbv | ||
| Color Indicator ( B - V ) | +1.21 [2] | ||
| Color Index ( U - B ) | +0.30 [2] | ||
| Variability | Lbv | ||
| physical characteristics | |||
| Weight | 13 [6] M ☉ | ||
| Radius | 150-330 [3] R ☉ | ||
| Temperature | 8 000-12 000 [3] K | ||
| Luminosity | 290,000 [1] L ☉ | ||
| Rotation | 45 km / s [3] | ||
| |||
| Information in databases | |||
| SIMBAD | data | ||
Physical characteristics
V905 Sco is an irregular variable, emission lines are present in the spectrum of the P Cygni type. In the maximum of brightness it resembles a star of spectral class A9, in a minimum - of class B8. [3] The estimated distance to the object is 2.5 kpc (8200 light years ) under the assumption that the absolute magnitude is -8.9 m . [6] This estimate is not accurate, the distance to the star is in the range from 1.9 kpc to 3.5 kpc. [3]
If we take the distance to V905 Sco equal to 2.5 kpc, then the star's radius changes from 150R по at rest to 330R ☉ with a flash. The temperature also varies, from 8000 K at a flash to 12000 K at rest. The apparent magnitude changes by 0.5 m . Luminosity is approximately 180000L. [3]
Estimates of the attractive force on the surface led to a mass of 13M ☉ and a probable initial mass of 25M. Perhaps, at an earlier stage of evolution, the star was a red supergiant [6]
Notes
- ↑ 1 2 Y .; Nazé; Rauw, G .; Hutsemékers, D. The first X-ray survey of Galactic luminous blue variables (Eng.) // Astronomy & Astrophysics: journal. - 2012. - Vol. 538 . - P. A47 . - DOI : 10.1051 / 0004-6361 / 201118040 . - . - arXiv : 1111.6375 .
- ↑ 1 2 3 JR; Ducati. VizieR Online Data Catalog: Catalog of Stellar Photometry in Johnson's 11-color system (Eng.) // CDS / ADC Collection of Electronic Catalogs: journal. - 2002. - Vol. 2237 . - P. 0 . - .
- ↑ 1 2 3 4 5 6 7 Stahl, O .; Gäng, T .; Sterken, C .; Kaufer, A .; Rivinius, T .; Szeifert, T .; Wolf, B. Long-term spectroscopic monitoring of the Luminous Blue Variable HD 160529 (Eng.) // Astronomy and Astrophysics: journal. - 2003. - March ( vol. 400 ). - P. 279-291 . - DOI : 10.1051 / 0004-6361: 20021908 . - . - arXiv : astro-ph / 0212473 .
- ↑ GA; Gontcharov. Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system (Eng.) // Astronomy Letters: journal. - 2006. - Vol. 32 , no. 11 - P. 759 . - DOI : 10.1134 / S1063773706110065 . - .
- ↑ 1 2 3 F .; Van Leeuwen. Validation of the new Hipparcos reduction (Eng.) // Astronomy and Astrophysics. - 2007. - Vol. 474 , no. 2 - P. 653 . - DOI : 10.1051 / 0004-6361: 20078357 . - . - arXiv : 0708.1752 .
- ↑ 1 2 3 4 Sterken, C .; Gosset, E .; Juttner, A .; Stahl, O .; Wolf, B .; Axer, M. HD 160529 - a New Galactic Luminous Blue Variable (Eng.) // Astronomy and Astrophysics. - 1991. - July ( vol. 247 , no. 2 ). - P. 383 . - .