WD 1337+705

WD 1337+705
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Minor
Right ascension 13h 38m 50.47569s
Declination +70° 17 07.6598
Apparent magnitude (V) 12.773
Characteristics
Spectral type DA2.4[1]
Astrometry
Proper motion (μ) RA: -403.65 ± 3.22 mas/yr
Dec.: -22.00 ± 3.60 mas/yr
Parallax (π)38.29 ± 3.02[2][2] mas
Distance85 ± 7 ly
(26 ± 2 pc)
Absolute magnitude (MV)10.56[1]
Details
Mass0.59[1] M
Luminosity0.03[3] L
Temperature21290 K[1] K
Other designations
WD 1337+705, EG 102, HIP 66578, LTT 18341
Database references
SIMBADdata

WD 1337+705 is a star in the constellation Ursa Minor. Shining with an apparent magnitude of 12.8, it is white dwarf 0.59 times as massive as the Sun.[1] It is 85 light-years distant from Earth.[2] It has 3% of the Sun's luminosity.[3]

In 1997, Jay Holberg and colleagues discovered magnesium in its spectrum, which suggests that it has some low mass companion or accretion of material happening as the star's temperature is not hot enough for its intrinsic emission.[4] Despite this, no direct evidence for a circumstellar disc, such as an infrared excess, has come to light.[5]

References

  1. 1 2 3 4 5 Gianninas, A.; Bergeron, P.; Ruiz, M. T. (2011). "A Spectroscopic Survey and Analysis of Bright, Hydrogen-rich White Dwarfs". The Astrophysical Journal 743 (2): 27. arXiv:1109.3171. Bibcode:2011ApJ...743..138G. doi:10.1088/0004-637X/743/2/138. 138.
  2. 1 2 3 van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics 474 (2): 653–64. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  3. 1 2 Bannister, N. P.; Barstow, M. A.; Holberg, J. B.; Bruhweiler, F. C. (2003). "Circumstellar features in hot DA white dwarfs". Monthly Notices of the Royal Astronomical Society 341 (2): 477–95. arXiv:astro-ph/0301204. Bibcode:2003MNRAS.341..477B. doi:10.1046/j.1365-8711.2003.06409.x.
  4. Holberg, Jay; Barstow, M.A.; Green, Elizabeth M. (1997). "The Discovery of Mg II &lgr;4481 in the White Dwarf EG 102: Evidence for Ongoing Accretion". The Astrophysical Journal 474: L127–L130. Bibcode:1997ApJ...474L.127H. doi:10.1086/310446.
  5. Dickinson, N. J.; Barstow, M. A.; Welsh, B. Y.; Burleigh, M.; Farihi, J.; Redfield, S.; Unglaub, K. (2012). "The origin of hot white dwarf circumstellar features". Monthly Notices of the Royal Astronomical Society 423 (2): 1397–1410. arXiv:1203.5226. Bibcode:2012MNRAS.423.1397D. doi:10.1111/j.1365-2966.2012.20964.x.
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