ESO 439-26
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 11h 39m 03.1036679378s[1] |
| Declination | −28° 52′ 16.627821186″[1] |
| Apparent magnitude (V) | 20.52[2] |
| Characteristics | |
| Spectral type | DC9[2] |
| U−B color index | 1.03[3] |
| B−V color index | 0.64[3] |
| R−I color index | 1.14[3] |
| Astrometry | |
| Proper motion (μ) | RA: -397.560[1] mas/yr Dec.: +36.758[1] mas/yr |
| Parallax (π) | 24.5 ± 1.0[1] mas |
| Distance | 133 ± 5 ly (41 ± 2 pc) |
| Absolute magnitude (MV) | 17.47[2] |
| Details | |
| Mass | 1.19±0.02[3] M☉ |
| Radius | 0.61[4] R☉ |
| Luminosity | 1.15 ×10−5 [3] L☉ |
| Surface gravity (log g) | 1.1 ×106 G[3] cgs |
| Temperature | 4,490±80[3] K |
| Other designations | |
Ruiz 439-26, WD 1136-286[1] | |
| Database references | |
| SIMBAD | 439-26 data |
ESO 439-26 is the least luminous white dwarf star known.[2][5] Located 140 light years away from the Sun, it is roughly 10 billion years old and has a temperature of 4560 Kelvin. Thus, despite being classified as a "white dwarf", it would actually appear reddish in color.[6]
References[]
- ^ a b c d e f "Ruiz 439-26". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 22, 2020.
- ^ a b c d María Teresa Ruiz, P. Bergeron, S. K. Leggett, and Claudio Anguita. "The Extremely Low Luminosity White Dwarf ESO 439-26". iopscience.iop.org. doi:10.1086/309845.CS1 maint: uses authors parameter (link)
- ^ a b c d e f g Bergeron, P.; Leggett, S. K.; Ruiz, María Teresa (April 2001). "Photometric and Spectroscopic Analysis of Cool White Dwarfs with Trigonometric Parallax Measurements". Astrophysical Journal Supplement Series. 133 (2): 413–449. arXiv:astro-ph/0011286. Bibcode:2001ApJS..133..413B. doi:10.1086/320356. S2CID 15511301.
- ^ Freese, Katherine; Krasteva, Eleonora (1999-03-15). "A bound on the flux of magnetic monopoles from catalysis of nucleon decay in white dwarfs". Physical Review D. 59 (6): 063007. arXiv:astro-ph/9804148. Bibcode:1999PhRvD..59f3007F. doi:10.1103/PhysRevD.59.063007. S2CID 14054944.
- ^ "The Faintest Known White Dwarf". www.noao.edu. 1 March 1996.
- ^ Kaler, James B. (May 7, 2006). The Hundred Greatest Stars. Springer Science & Business Media. ISBN 9780387216256 – via Google Books.
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