Wolf 1130

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Double star
wolf 1130
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation swan
Right ascension 20 h 05 m 2.19 s
declination + 54 ° 26 ′ 3.2 ″
Apparent brightness 11.98 likes
Typing
Spectral class sdM1.5
Variable star type UV 
Astrometry
Radial velocity (−108) km / s
parallax (60.39 ± 0.03)  mas
distance (53.98 ± 0.03)  Lj
(16,56)  pc
Visual absolute brightness M vis (10.88) mag
Proper movement 
Rec. Share: (−1159.47 ± 0.08)  mas / a
Dec. portion: (−903.57 ± 0.07)  mas / a
Physical Properties
Dimensions (0.3) / (1.2)  M ☉
radius (0.3) / (<< 0.01)  R ☉
Effective temperature (3500) / (<7000)  K
Metallicity [Fe / H] (−0.7 ± 0.12)
Other names
and catalog entries
Gliese catalog FY 781 [1]
Hipparcos catalog HIP 98906 [2]
Tycho catalog TYC 3940-582-1 [3]
2MASS catalog 2MASS J20050227 + 5426037 [4]
Other names V1513 Cygni

Wolf 1130 is a star system in the constellation Swan . The system is at a distance of 54 light years and probably consists of 3 components. The brightest component is a cool sub-dwarf and also a flare star . This star orbits a massive, cool white dwarf of the ONe type, which has so far remained invisible. These two orbiting stars are finally orbited in about 3150 AU by a brown dwarf wolf 1130 C , which is divided into the spectral class T8. The system is a possible precursor to a cataclysmic binary star system as well as a potential candidate for a type Ia supernova in the distant future.

The system is probably quite old. This is concluded on the one hand due to the low metallicity , on the other hand also from the fact that the ONe white dwarf has not yet been discovered and with a surface temperature of less than 7000 K it must be relatively cool. The white dwarf appears to be at least 3.7 billion years old, and the system may even be older than 10 billion years.

Individual evidence

  1. ↑ a b c d e Wolf 1130. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on August 5, 2018 .
  2. ↑ a b John E. Gizis: High Chromospheric activity in M subdwarfs . In: The Astronomical Journal . 115, No. 5, May 1998, pp. 2053-2058. arxiv : astro-ph / 9801305 . bibcode : 1998AJ .... 115.2053G . doi : 10.1086 / 300325 .
  3. ↑ a b V1513 Cyg. In: VSX. AAVSO, accessed August 5, 2018 .
  4. ↑ a b c d e f Gregory N. Mace: Wolf 1130: A Nearby Triple System Containing a Cool, Ultramassive White Dwarf . In: The Astrophysical Journal . 854, No. 2, Feb 2018. arxiv : 1802.04803 . bibcode : 2018ApJ ... 854..145M . doi : 10.3847 / 1538-4357 / aaa8dd .
  5. ↑ a b c Gregory N. Mace: The Exemplar T8 Subdwarf Companion of Wolf 1130 . In: The Astrophysical Journal . 777, No. 1, Nov 2013. arxiv : 1309.1500 . bibcode : 2013ApJ ... 777 ... 36M . doi : 10.1088 / 0004-637X / 777/1/36 .