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H1504+65

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White dwarf in Ursae Minoris constellation
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H1504+65
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Minor
Right ascension 15 02 09.6297
Declination +66° 12′ 19.1461″
Apparent magnitude (V) 15.9
Characteristics
Astrometry
Proper motion (μ) RA: −6.055±0.128 mas/yr
Dec.: 8.106±0.112 mas/yr
Parallax (π)2.0573 ± 0.0591 mas
Distance1,590 ± 50 ly
(490 ± 10 pc)
Details
Temperature200,000 K
Other designations
WD 1501+663
Database references
SIMBADdata

H1504+65 is an enigmatic peculiar star in the constellation Ursa Minor. With a surface temperature of 200,000 K (360,000°F) and an atmosphere composed of carbon, oxygen and 2% neon, it is the second hottest white dwarf ever discovered, with only RX J0439.8−6809 being hotter. It is thought to be the stellar core of a post-asymptotic giant branch star, though its composition is unexplainable by current models of stellar evolution.

References

  1. ^ 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. Werner, K.; Rauch, T. (2011). "UV spectroscopy of the hot bare stellar core H1504+65 with the HST Cosmic Origins Spectrograph". Astrophysics and Space Science. 335 (1): 121–24. Bibcode:2011Ap&SS.335..121W. doi:10.1007/s10509-011-0617-x. S2CID 116910726.
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