The coolest DA white dwarfs detected at soft X-ray wavelengths

Details The coolest DA white dwarfs detected at soft X-ray wavelengths The coolest DA white dwarfs detected at soft X-ray wavelengths

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...394..288k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 394, no. 1, July 20, 1992, p. 288-297. Research supported by NASA, SERC, NS

Astronomy and Astrophysics

Astronomy

28

Stellar Spectrophotometry, White Dwarf Stars, X Ray Astronomy, Abundance, Helium, Iue, Lyman Alpha Radiation, Stellar Atmospheres, Stellar Temperature

Scientific paper

New soft X-ray/EUV photometric observations of the DA white dwarfs KPD 0631 + 1043 = WD 0631 + 107 and PG 1113 + 413 = WD 1113 + 413 are analyzed. Previously reported soft X-ray detections of three other DAs and the failure to detect a fourth DA in deep Exosat observations are investigated. New ground-based spectra are presented for all of the objects, with IUE Ly-alpha spectra for some. These data are used to constrain the effective temperatures and surface gravities. The improved estimates of these parameters are employed to refer a photospheric He abundance for the hotter objects and to elucidate an effective observational low-temperature threshold for the detection of pure hydrogen DA white dwarfs at soft X-ray wavelengths.

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