A White Dwarf Accreting Asteroids

Physics

Scientific paper

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Stars, White Dwarfs, Solar System, Gd 362, Xmm-Newton Proposal 04035001

Scientific paper

We propose to observe the isolated white dwarf GD 362 (D=25 pc) to search for X-ray emission from the accretion of circumstellar material. Most isolated white dwarfs have atmospheres that are either pure H or He, but GD 362 also exhibits strong metal lines, even though metals should settle out of the photosphere in only a few years. In the last year, GD 362 was discovered to exhibit excess infrared emission from orbiting dust that may have been produced by the tidal disruption of an asteroid. Accretion from this dust can account for the atmospheric metals, and would produce at least 0.5e28 erg/s in X-rays. A measurement of the flux and spectrum of X-rays is needed to confirm the accretion hypothesis, and determine how much H is accreted with the metals.

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