Direct Distance Measurement to the Dusty White Dwarf GD 362

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The Astrophysical Journal, ISSN: 0004-637X, Vol: 689, Issue: 1, Page: L45-L47

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Kilic, Mukremin; Thorstensen, John R; Koester, D.
IOP Publishing
Physics and Astronomy; Earth and Planetary Sciences; astrophysics; Astrophysics and Astronomy; Physical Sciences and Mathematics; Stars, Interstellar Medium and the Galaxy
article description
We present trigonometric parallax observations of GD 362 obtained over seven epochs using the MDM 2.4 m Hiltner Telescope. The existence of a dust disk around this possibly massive white dwarf makes it an interesting target for parallax observations. The measured parallax for GD 362 places it at a distance of 50.6+/-pc, which implies that its radius and mass are ≈0.0106 R&o. and 0.71 M&o., respectively. GD 362 is not as massive as initially thought (1.2 M&o.). Our results are entirely consistent with the distance and mass estimates (52.2 pc and 0.73 M&o.) by Zuckerman et al., who demonstrated that GD 362 has a helium-dominated atmosphere. Dropping GD 362 from the list of massive white dwarfs, there are no white dwarfs with M > 0.9 M&o. that are known to host circumstellar dust disks. © 2008. The American Astronomical Society.