Astronomy:GD 40
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Short description: Star in the constellation Cetus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| 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[lower-alpha 1] R☉ |
| Luminosity | 0.0068 L☉ |
| Surface gravity (log g) | 7.91±0.18 cgs |
| 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 of 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 of the asteroid 4 Vesta.
See also
- ZZ Piscium
- GD 61, white dwarf with an observed asteroid
Notes
- ↑ Derived from known mass and gravity of star; radius is consistent with known luminosity and temperature within 0.4%.
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 Limoges, M.-M.; Bergeron, P. (2010). "A Spectroscopic Analysis of White Dwarfs in the Kiso Survey". The Astrophysical Journal 714 (2): 1037–1051. doi:10.1088/0004-637X/714/2/1037. Bibcode: 2010ApJ...714.1037L.
- ↑ Klein (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. doi:10.1088/0004-637X/709/2/950. Bibcode: 2010ApJ...709..950K.
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