GD 40

GD 40
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 03h 02m 53.10375s[1]
Declination −01° 08′ 33.7987″[1]
Apparent magnitude (V) 15.56[2]
Characteristics
Spectral type DB[2]
Astrometry
Parallax (π)15.3618 ± 0.0456 mas[1]
Distance212.3 ± 0.6 ly
(65.1 ± 0.2 pc)
Absolute magnitude (MV)11.30[2]
Details
Mass0.59[3] M☉
Radius0.01? R☉
Luminosity0.0068[2] L☉
Surface gravity (log g)7.91 ± 0.18[2] cgs
Temperature15300[3] K
Age200 million years
Other designations
GD 40, EGGR 384, US 3562, WD 0300-019
Database references
SIMBADdata

GD 40 is a white dwarf in the constellation Cetus. It is located about 212 light-years (65 parsecs) away from the Sun.[1] 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.[3] The disrupted object should have had roughly the same mass of the Solar System asteroid 3 Juno.

  1. ^ 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.
  2. ^ 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.
  3. ^ a b c 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.