XMM-Newton Proposal 03028201

Details XMM-Newton Proposal 03028201 XMM-Newton Proposal 03028201

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004xmm..prop..104m&link_type=abstract

XMM-Newton Proposal ID #03028201

Physics

Stars, White Dwarfs, Solar System, G29-38, Xmm-Newton Proposal 03028201

Scientific paper

We propose to observe the isolated white dwarf G29-38 (D = 14 pc) to search for X-rays from the accretion of circumstellar material. Most white dwarfs have atmospheres that are either pure H or He, but G29-38 is rare in that it also exhibits atmospheric metal lines, even though metals should settle out of the photosphere is only ~20 years. G29-38 also exhibits 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. We expect between 3x10^25 and 8x10^27 erg/s in X-rays; the exact value would provide the first measurement of the efficiency of X-ray production at accretion rates orders of magnitudes below those detectable in CVs.

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