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GD 40
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 03h 02m 53.10375s[2] |
| Declination | −01° 08′ 33.7987″[2] |
| Apparent magnitude (V) | 15.56[3] |
| Characteristics | |
| Evolutionary stage | white dwarf[3] |
| Spectral type | DB[3] |
| Astrometry | |
| Parallax (π) | 15.3618±0.0456 mas[2] |
| Distance | 212.3 ± 0.6 ly (65.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 11.30[3] |
| Details[3] | |
| Mass | 0.54 M☉ |
| Radius | 0.014±0.003[a] R☉ |
| Luminosity | 0.0068 L☉ |
| Surface gravity (log g) | 7.91±0.18 cgs |
| Temperature | 14,280±298 K |
| Age | 200 Myr |
| Other designations | |
| GD 40, EGGR 384, US 3562, WD 0300-013 | |
| Database references | |
| SIMBAD | data |
GD 40 is a white dwarf in the constellation Cetus. It is located about 212 light-years (65 parsecs) away from the Sun.[2] The star's spectrum has been found to show traces of external metal contamination due to disruption of an extrasolar dwarf planet or an asteroid.[4] The disrupted object should have had at least the same mass as the asteroid 4 Vesta.
See also
[edit]- ZZ Piscium
- GD 61, white dwarf with an observed asteroid
Notes
[edit]- ^ Derived from known mass and gravity of star; radius is consistent with known luminosity and temperature within 0.4%.
References
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e Limoges, M.-M.; Bergeron, P. (2010). "A Spectroscopic Analysis of White Dwarfs in the Kiso Survey". The Astrophysical Journal. 714 (2): 1037–1051. arXiv:1003.4313. Bibcode:2010ApJ...714.1037L. doi:10.1088/0004-637X/714/2/1037. S2CID 118618131.
- ^ Klein; et al. (2010). "Chemical Abundances in the Externally Polluted White Dwarf GD 40: Evidence of a Rocky Extrasolar Minor Planet". The Astrophysical Journal. 709 (2): 950–962. arXiv:0912.1422. Bibcode:2010ApJ...709..950K. doi:10.1088/0004-637X/709/2/950. S2CID 118312133.
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