GD 40

Last updated
GD 40
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
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.

Contents

See also

Notes

  1. ↑ Derived from known mass and gravity of star; radius is consistent with known luminosity and temperature within 0.4%.

References

  1. ↑ 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.
  2. 1 2 3 4 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.
  3. 1 2 3 4 5 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.
  4. ↑ 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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