XMM-Newton Proposal 03010101

Details XMM-Newton Proposal 03010101 XMM-Newton Proposal 03010101

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004xmm..prop...36w&link_type=abstract

XMM-Newton Proposal ID #03010101

Computer Science

Stars, White Dwarfs, Solar System, H1504+65, Xmm-Newton Proposal 03010101

Scientific paper

H1504+65 is the hottest known white dwarf (Teff=200,000 K). Its photosphere is mainly composed of carbon and oxygen, hence this unique white dwarf resembles the bare stellar core of a former red giant. Because of its high effective temperature H1504+65 is the only star at all which shows a photospheric absorption line spectrum in the soft X-ray region. We have analysed a Chandra spectrum and identified a wealth of spectral lines from highly ionized O, Ne, and Mg. We also detect nickel lines but, surprisingly, fail to detect iron. The reduced iron opacity allows thermal radiation to escape from deep hot layers. Our models predict that XMM-Newton could for the first time acquire a stellar photospheric spectrum in the 10-30 Angstroem (1.2-0.4 KeV) region. This enables a precise temperature determination.

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