Gliese 318 Explained

Gliese 318 is a white dwarf in the constellation Pyxis. Its spectral type is DA5.5 and it has a visual magnitude of 11.85, and lies 27.8lk=onNaNlk=on away.[1] The star was too faint to have had its parallax measured by the Hipparcos satellite. Earth-based measurement in 2009 gave its parallax as 113.63 ± 1.97 milliarcseconds, yielding a distance of 28.7 ± 0.5 light-years; this parallax measurement has since been substantially improved by Gaia. It is around 45% as massive as the Sun but has only 0.15% its luminosity.

Bragaglia et al. suspect this star to be a double white dwarf due to strong spectral line variations.[2] From Gaia DR2 it was not possible to confirm this claim. It is still possible that Gliese 318 is a double white dwarf and additional spectroscopic observations are needed in order to confirm this claim.[3] Gliese 318 could be the closest double white dwarf to earth.[4] [5]

References

Notes and References

  1. Sion . Edward M. . 2009 . 1.The White Dwarfs Within 20 Parsecs of the Sun: Kinematics and Statistics . The Astronomical Journal . 138 . 6 . 1681 . 10.1088/0004-6256/138/6/1681. 0910.1288 . 2009AJ....138.1681S . 119284418 .
  2. Bragaglia . Angela . Greggio . Laura . Renzini . Alvio . D'Odorico . Sandro . 1990-12-01 . Double Degenerates among DA White Dwarfs . The Astrophysical Journal . 365 . L13 . 10.1086/185877 . 1990ApJ...365L..13B . 0004-637X . 2023-04-25 . 2023-04-25 . https://web.archive.org/web/20230425154725/https://ui.adsabs.harvard.edu/abs/1990ApJ...365L..13B . live .
  3. Hollands . M. A. . Tremblay . P. -E. . Gänsicke . B. T. . Gentile-Fusillo . N. P. . Toonen . S. . 2018-11-01 . The Gaia 20 pc white dwarf sample . Monthly Notices of the Royal Astronomical Society . 480 . 3 . 3942–3961 . 10.1093/mnras/sty2057 . free . 2018MNRAS.480.3942H . 0035-8711 . 1805.12590 .
  4. Toonen . S. . Hollands . M. . Gänsicke . B. T. . Boekholt . T. . 2017-06-01 . The binarity of the local white dwarf population . Astronomy and Astrophysics . 602 . A16 . 10.1051/0004-6361/201629978 . 2017A&A...602A..16T . 0004-6361. free . 1703.06893 .
  5. Bagnulo . S. . Landstreet . J. D. . 2021-11-01 . New insight into the magnetism of degenerate stars from the analysis of a volume-limited sample of white dwarfs . Monthly Notices of the Royal Astronomical Society . 507 . 4 . 5902–5951 . 10.1093/mnras/stab2046 . free . 0035-8711 . 2106.11109 . 2021MNRAS.507.5902B .

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