LBV 1806-20 is a bright blue variable star in the constellation Sagittarius , a hypergiant , possibly a double star . Located at a distance of 30,000 - 49,000 light years from Earth .
| LBV 1806-20 | |||
|---|---|---|---|
| Star | |||
| Observational data ( Epoch J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Visible magnitude ( V ) | 35 m (in the infrared spectrum up to 8 m ) | ||
| Constellation | Sagittarius | ||
| Specifications | |||
| Spectral class | |||
| Variability | SDOR | ||
| physical characteristics | |||
| Weight | 130—200 M | ||
| Radius | > 200 [1] R ☉ | ||
| Age | <2⋅10 6 years | ||
| Temperature | 18 000-36 000 K | ||
| Luminosity | > 2⋅10 6 L ☉ | ||
| Metallicity | 17-32% Sun | ||
| |||
| Information in databases | |||
| SIMBAD | |||
The star has a mass of 130-150 solar masses and luminosity of more than 2 million luminosities of the sun [2] . Despite such a monstrous brightness, the star is not visible in the solar system, less than one billionth of its radiation reaches us, the rest is absorbed by clouds of gas and dust, and it is impossible to see it in the visible range. In infrared rays with a wavelength of 2 μm, the star has the eighth magnitude, but in the visible spectrum this brightness is equal to 35th magnitude. Therefore, it is still impossible to see a star in visible brightness - the Hubble telescope can see objects up to the 30th magnitude, and only in the future such objects can be seen with the help of new super-power telescopes.
Content
Star Properties
According to the theory of the evolution of stars, an ordinary star can have a mass of no more than 100-120 solar masses, but studies have shown that the mass of LBV 1806-20 can be from 130 to more than 190 solar masses. The luminosity of the star was estimated by high - precision speckle interferometry , which made it possible to say that the LBV 1806-20 is a single star [3] .
However, recent additional studies have forced scientists to assume that the star has a satellite, and the mass of each component of the system may be much less than 130 solar masses [4] .
Location
LBV 1806-20 lies at the center of the radio nebula G 10.0 - 0.3 and belongs to the star cluster 1806-20, which is located in W31, one of the largest H II regions in the Milky Way . The 1806-20 cluster consists of very unusual stars, including two carbon- rich Wolf-Rayet stars (WC9d and BKT), two blue hypergiants and the SGR 1806-20 magnetar .
See also
- Star Pistol
- This carina
- List of the most massive stars
- List of the most powerful stars
Notes
- ↑ Big and Giant Stars: LBV 1806-20
- ↑ Aaron Hoover. Star may be the biggest, brightest yet observed . HubbleSite (5 January 2004). The appeal date is July 4, 2008. Archived March 2, 2012.
- ↑ Eikenberry, SS; Matthews, K; LaVine, JL; Garske, MA; Mu, D .; Jackson, MA; Patel, SG; Barry, DJ; Colonno, MR; Houck, JR; Wilson, JC; Corbel, S .; Smith, JD Infrared Observations of the Candidate LBV 1806-20 & Nearby Cluster Stars (eng.) // The Astrophysical Journal: journal. - November 2004. - Vol. Volume 616, Issue 1 . - P. 506-518 . - DOI : 10.1086 / 422180 .
- ↑ Figer, D .; Najarro, F .; Kudritzki, R. The Double-lined Spectrum of LBV 1806-20 (Eng.) // The Astrophysical Journal. - August 2004. - Vol. Volume 610, Issue 2 . - P. L109 — L112 . - DOI : 10.1086 / 423306 .