UV spectroscopy of the hot bare stellar core H1504+65

Details UV spectroscopy of the hot bare stellar core H1504+65 UV spectroscopy of the hot bare stellar core H1504+65

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11601w&link_type=abstract

HST Proposal ID #11601. Cycle 17

Computer Science

Scientific paper

H1504+65 is the hottest known white dwarf {Teff=200,000 K}. It has an extraordinary surface composition. The surface is devoid of hydrogen and helium. It is mainly composed of carbon and oxygen {by equal amounts} and neon {2%}. We obviously see the exposed core of a former red giant. The evolutionary history of this unique object is unknown. We have identified magnesium absorption lines in the soft X-ray photospheric Chandra spectrum, which suggests that H1504+65 may be an O-Ne-Mg white dwarf. We will test this hypothesis by abundance determinations of Mg and Na. If confirmed, then H1504+65 would be the most compelling case for the existence of single O-Ne-Mg white dwarfs.;

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