WD 1337+705 explained

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 86.5 light-years distant from Earth. It has 3% of the Sun's luminosity.^[2]

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.^[3] Despite this, no direct evidence for a circumstellar disc, such as an infrared excess, has come to light.^[4]

Notes and References

1. Gianninas, A. . Bergeron, P. . Ruiz, M. T. . 2011. A Spectroscopic Survey and Analysis of Bright, Hydrogen-rich White Dwarfs. The Astrophysical Journal. 743. 2. 138. 27. 10.1088/0004-637X/743/2/138 . 2011ApJ...743..138G. 1109.3171 . 119210906 .
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. 10.1046/j.1365-8711.2003.06409.x. free . 2003MNRAS.341..477B. astro-ph/0301204 . 122754617 .
3. Holberg. Jay . Barstow, M.A. . Green, Elizabeth M.. 1997. The Discovery of Mg II λ4481 in the White Dwarf EG 102: Evidence for Ongoing Accretion. The Astrophysical Journal. 474. 2 . L127–L130. 10.1086/310446. 1997ApJ...474L.127H.
4. 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. 10.1111/j.1365-2966.2012.20964.x . free . 2012MNRAS.423.1397D. 1203.5226 . 119212643 .