H1504+65
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Minor[1] |
| Right ascension | 15h 02m 09.6297s[2] |
| Declination | +66° 12′ 19.146″[2] |
| Apparent magnitude (V) | 16.37[3] |
| Characteristics | |
| Evolutionary stage | white dwarf[4] |
| Spectral type | DZQ1[4] |
| Astrometry | |
| Proper motion (μ) | RA: −6.055±0.128[2] mas/yr Dec.: 8.106±0.112[2] mas/yr |
| Parallax (π) | 2.0573±0.0591 mas[2] |
| Distance | 1,590 ± 50 ly (490 ± 10 pc) |
| Details | |
| Temperature | 200,000 K |
| Other designations | |
| WD 1501+663 | |
| Database references | |
| SIMBAD | data |
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.[5]
References
- ^ 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 e 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.
- ^ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog. Bibcode:2012yCat.1322....0Z.
- ^ a b Wesemael, F.; Greenstein, J. L.; Liebert, James; Lamontagne, R.; Fontaine, G.; Bergeron, P.; Glaspey, J. W. (1993). "An Atlas of Optical Spectra of White-Dwarf Stars". Publications of the Astronomical Society of the Pacific. 105: 761. Bibcode:1993PASP..105..761W. doi:10.1086/133228.
- ^ 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.