PW Andromeda ( lat. PW Andromedae ) is a star that is located in the constellation Andromeda at a distance of about 91.3 [1] light years from us.
| PW Andromeda | |||
|---|---|---|---|
| Star | |||
| Observational data ( Epoch J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 91.32 sv. years (28 pc ) [1] | ||
| Constellation | Andromeda | ||
| Astrometry | |||
| Radial velocity ( R v ) | -11.0 [2] km / s | ||
| Proper motion (μ) | RA: 143.7 [2] mas per year Dec: -171.5 [2] mas per year | ||
| Specifications | |||
| Spectral class | K2VD [2] | ||
| Color Indicator ( B - V ) | 1.04 [3] | ||
| Variability | |||
| physical characteristics | |||
| Radius | 0.8 [3] R ☉ | ||
| Age | 100 million [4] years | ||
| Temperature | |||
| Rotation | 1,76159 days [6] | ||
| |||
| Information in databases | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Characteristics
The Andromeda PW is a young orange dwarf that goes to the main sequence according to the Hertzsprung-Russell diagram . The radius of a star is equal to 0.8 times the radius of the Sun, [3] its age is estimated at 100 million years. [4] In 2006, the first Doppler mapping of the star was done. [6] Cold spots with a temperature of 1200 degrees Kelvin were observed, which moved in groups within ± 40 ° from the stellar equator. The exact period of rotation of the star around its axis was also determined, it is equal to 1.76159 days.
PW Andromeda belongs to the moving group of stars AB Golden Fish , whose average age of the elements is estimated at 50 million years.
Notes
- ↑ 1 2 Zuckerman, B .; Song, Inseok; Bessell, MS The AB Doradus Moving Group (Eng.) . The Astrophysical Journal, Volume 613, Issue 1, pp. L65-L68. (09/2004). The date of circulation is December 10, 2009. Archived April 12, 2012.
- ↑ 1 2 3 4 5 SIMBAD (English) . - PW Andromeda in SIMBAD database . The appeal date is December 8, 2009.
- ↑ 1 2 3 Mullan, DJ; Mathioudakis, M .; Bloomfield, DS; Christian, DJ A Comparative Study of Flaring Loops in Active Stars (eng.) . The Astrophysical Journal Supplement Series, Volume 164, Issue 1, pp. 173-201. (05/2006). The appeal date is December 8, 2009. Archived April 12, 2012.
- ↑ 1 2 Lowrance, Patrick J .; Becklin, EE; Schneider, Glenn; Kirkpatrick, J. Davy; Weinberger, Alycia J .; Zuckerman, B .; Dumas, Christophe; Beuzit, Jean-Luc; Plait, Phil; Malumuth, Eliot; Heap, Sally; Terrile, Richard J .; Hines, Dean C. An Infrared Coronagraphic Survey for Substellar Companions (Eng.) . The Astronomical Journal, Volume 130, Issue 4, pp. 1845-1861. (10/2005). The date of circulation is December 10, 2009. Archived April 12, 2012.
- 2 1 2 M. Asplund , L. Casagrande , S. Cassisi New constraints and the Galactic disc (s) // Astron. Astrophys. - EDP Sciences , 2011. - Vol. 530. - P. A138. - ISSN 0004-6361 ; 0365-0138 ; 1432-0746 ; 1286-4846 - doi: 10.1051 / 0004-6361 / 201016276
- ↑ 1 2 Strassmeier, KG; Rice, JB First Doppler K2-dwarf PW Andromedae = HD 1405 (Eng.) . Astronomy and Astrophysics, Volume 460, Issue 3, December IV 2006, pp.751-758 (12/2006). The date of circulation is December 10, 2009. Archived April 12, 2012.
See also
- List of stars of the constellation Andromeda