Astronomy:ESO 439-26
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Short description: White dwarf star
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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 | 0.0126[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 | 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 yellowish in color.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "Ruiz 439-26". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Ruiz+439-26.
- ↑ 2.0 2.1 2.2 2.3 María Teresa Ruiz; P. Bergeron; S. K. Leggett; Claudio Anguita (1995). "The Extremely Low Luminosity White Dwarf ESO 439-26". The Astrophysical Journal 455. doi:10.1086/309845. Bibcode: 1995ApJ...455L.159R. https://iopscience.iop.org/article/10.1086/309845/fulltext/5601.text.html.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 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. doi:10.1086/320356. Bibcode: 2001ApJS..133..413B.
- ↑ Ruiz, Maria Teresa; Bergeron, P.; Leggett, S. K.; Anguita, Claudio (1995-12-01). "The Extremely Low Luminosity White Dwarf ESO 439-26". The Astrophysical Journal 455: L159. doi:10.1086/309845. ISSN 0004-637X. https://ui.adsabs.harvard.edu/abs/1995ApJ...455L.159R.
- ↑ "The Faintest Known White Dwarf". 1 March 1996. https://www.noao.edu/noao/noaonews/mar96/art3.html.
- ↑ Kaler, James B. (May 7, 2006). The Hundred Greatest Stars. Springer Science & Business Media. ISBN 9780387216256. https://books.google.com/books?id=jmoQBwAAQBAJ&q=ESO+439-26&pg=PA75.
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