a Search for Coronal X-Rays from White Dwarfs by Chandra

Details a Search for Coronal X-Rays from White Dwarfs by Chandra a Search for Coronal X-Rays from White Dwarfs by Chandra

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..541m&link_type=abstract

Chandra Proposal ID #02200175

Physics

Chandra Proposal Id #02200175

Scientific paper

Observations of DA and DB white dwarfs have not been successful in detecting coronal X-ray emission, but observations of late-type dwarfs and giants show that coronae are common for these stars. To produce coronal X-rays, a star has to have a well-developed convection zone and a dynamo-generated magnetic field. There is strong evidence that the DB star GD 358 and the DA star LHS 1038 have weak and variable surface magnetic fields. Theory suggests that these fields are generated by dynamo action, and that both stars have well-developed convection zones. These stars are among the most promising white dwarf candidates for having coronal X-ray emission at level detectable by CHANDRA. Its discovery would confirm the existence of a new class of objects with convection-dynamo driven X-rays.

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