GD 40
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 03h 02m 53.36s |
| Declination | −01° 08′ 32.1″ |
| Apparent magnitude (V) | 15.56 |
| Characteristics | |
| Spectral type | DA |
| Astrometry | |
| Distance | ? ly (? pc) |
| Details | |
| Mass | 0.59 [1] M☉ |
| Radius | 0.01? R☉ |
| Luminosity | 0.0049 L☉ |
| Temperature | 15300[1] K |
| Age | 200 million years |
| Other designations | |
GD 40. | |
GD 40 is a white dwarf in the constellation Cetus. The star's spectrum has been found to show traces of external of metal contamination due to disruption of an extrasolar dwarf planet or an asteroid.[1] The disrupted object should have had roughly the same mass of the Solar System asteroid 3 Juno.
See also
- ZZ Piscium
- GD 61, white dwarf with an observed asteroid
References
- 1 2 3 Klein; et al. (2009). "Chemical Abundances in the Externally Polluted White Dwarf GD 40: Evidence of a Rocky Extrasolar Minor Planet". arXiv:0912.1422. Bibcode:2010ApJ...709..950K. doi:10.1088/0004-637X/709/2/950.
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