V838 Unicorn (V838 Mon) is an unusual variable star in the constellation Unicorn , located at a distance of about 20,000 light years (6 kpc ) from the Sun [2] . The star experienced a serious explosion in early 2002 . Initially it was assumed that the cause of the explosion was the usual outbreak of a new one , but later this hypothesis was refuted. The cause of the outburst is still unclear, but several theories have been put forward, for example, that the explosion is associated with the process of dying of a star and absorption of a companion or planets [3] . The surface temperature of the Unicorn V838 is 3270 Kelvin, the radius is 380 times the radius of the Sun, and the luminosity is 15,000 times the luminosity of the Sun.
| V838 Unicorn | |||
|---|---|---|---|
| Star | |||
 V838 Unicorn and light echo , Hubble telescope image December 17, 2002 | |||
| Observational data ( Epoch J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 20 000 sv. years old | ||
| Visible magnitude ( V ) | 15.74 | ||
| Constellation | Unicorn | ||
| Astrometry | |||
| Parallax (π) | 0.163 ± 0.002 mas | ||
| Absolute magnitude (V) | -5,5 | ||
| Specifications | |||
| Spectral class | M6.3I [1] | ||
| physical characteristics | |||
| Weight | 18 M ☉ | ||
| Radius | 380 [1] R ☉ | ||
| Temperature | 3270 [1] K | ||
| Luminosity | 15000 [1] L ☉ | ||
| Properties | variable | ||
| |||
| Information in databases | |||
| SIMBAD | |||
Content
Images
Galactic Longitude 217.7975 ° | Play media file Video from V838 Mon images taken by the Hubble telescope for 4 years (2002-2006). Demonstrates the evolution of light echo [4] |
See also
- List of the largest stars
- List of the most powerful stars
Notes
- ↑ 1 2 3 4 R. Tylenda, T. Kamińsk, M. Schmidt, R. Kurtev and T. Tomov. High-resolution optical spectroscopy of V838 Monocerotis in 2009 . Eso. The appeal date is March 18, 2013. Archived March 21, 2013.
- ↑ Retter, A .; Zhang, B .; Siess, L .; LeoVinson, V838: Monocerotis conclusions for the depth of the planet / s
- ↑ Download animation (713 Kb)
- ↑ information@eso.org, Monocerotis V838 Monocerotis , echo around , http://www.spacetelescope.org/videos/heic0617a/ > . Verified January 27, 2017.
Links
- Magazine Miranda, Astronet - "When the secret becomes apparent - the phenomenon of light echo"
- Miranda Astronet Magazine - “Gamma-Surge helps to study our own galaxy (in the footsteps of GRB 031203)”
- True. Ru - The merger of two stars took the flash of supernova SN 2009ip
- A YouTube video compiled from several photographs from the Hubble telescope for 4 years, from 2002 to 2006.