Computer Science
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10141w&link_type=abstract
HST Proposal ID #10141
Computer Science
Hst Proposal Id #10141 Hot Stars
Scientific paper
H1504+65 ist the hottest known white dwarf {Teff=200 000 K}. It has an extraordinary surface composition. The photosphere is devoid of hydrogen and helium. It is mainly composed of carbon and oxygen {by equal parts} 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 a 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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