Supersoft Sources at Low Metallicity: SMC 13

Details Supersoft Sources at Low Metallicity: SMC 13 Supersoft Sources at Low Metallicity: SMC 13

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2120l&link_type=abstract

Chandra Proposal ID #08300667

Physics

Chandra Proposal Id #08300667

Scientific paper

The identification of SN Ia progenitors remains elusive. A promising channel leading to a SN Ia event involves accreting white dwarfs (WD) that sustain steady nuclear burning. They are observed as close binary X-ray sources with a supersoft spectrum (CBSS). We propose to obtain the first Chandra LETGS spectrum of SMC 13, a CBSS in the SMC. From absorption line spectroscopy, we will achieve significant advances in determing the properties of SMC 13 and provide unique data to constrain new evolutionary calculations of accreting hot white dwarfs. At low metallicities, the population of SN Ia progenitors shifts toward systems with higher initial WD masses and lower mass donor stars. This difference might turn out to be crucial to understanding the physics of local vs. distant SN Ia.

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