From Wikipedia, the free encyclopedia
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  mas [1]
Distance133 ± 5  ly
(41 ± 2  pc)
Absolute magnitude (MV)17.47 [2]
Details
Mass1.19±0.02 [3]  M
Radius0.0126 [4]  R
Luminosity1.15 ×10−5 [3]  L
Surface gravity (log g)1.1 ×106 G [3]  cgs
Temperature4,490±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. ^ a b c d e f "Ruiz 439-26". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 22, 2020.
  2. ^ a b c d María Teresa Ruiz; P. Bergeron; S. K. Leggett; Claudio Anguita (1995). "The Extremely Low Luminosity White Dwarf ESO 439-26". The Astrophysical Journal. 455. Bibcode: 1995ApJ...455L.159R. doi: 10.1086/309845. S2CID  120193018.
  3. ^ 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.
  4. ^ 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.
  5. ^ "The Faintest Known White Dwarf". www.noao.edu. 1 March 1996. Archived from the original on 12 March 2021. Retrieved 8 May 2020.
  6. ^ Kaler, James B. (May 7, 2006). The Hundred Greatest Stars. Springer Science & Business Media. ISBN  9780387216256 – via Google Books.
From Wikipedia, the free encyclopedia
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  mas [1]
Distance133 ± 5  ly
(41 ± 2  pc)
Absolute magnitude (MV)17.47 [2]
Details
Mass1.19±0.02 [3]  M
Radius0.0126 [4]  R
Luminosity1.15 ×10−5 [3]  L
Surface gravity (log g)1.1 ×106 G [3]  cgs
Temperature4,490±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. ^ a b c d e f "Ruiz 439-26". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 22, 2020.
  2. ^ a b c d María Teresa Ruiz; P. Bergeron; S. K. Leggett; Claudio Anguita (1995). "The Extremely Low Luminosity White Dwarf ESO 439-26". The Astrophysical Journal. 455. Bibcode: 1995ApJ...455L.159R. doi: 10.1086/309845. S2CID  120193018.
  3. ^ 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.
  4. ^ 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.
  5. ^ "The Faintest Known White Dwarf". www.noao.edu. 1 March 1996. Archived from the original on 12 March 2021. Retrieved 8 May 2020.
  6. ^ Kaler, James B. (May 7, 2006). The Hundred Greatest Stars. Springer Science & Business Media. ISBN  9780387216256 – via Google Books.

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