Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.273..812h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 273, Issue 3, pp. 812-820.
Astronomy and Astrophysics
Astronomy
13
Stars: Agb And Post-Agb, Stars: Atmospheres, Stars: Fundamental Parameters, White Dwarfs, Radio Lines: Ism, X-Rays: Stars
Scientific paper
We present the observations of the five planetary nebula central stars detected during the ROSAT Wide Field Camera all-sky survey. These data are supplemented with ROSAT Position Sensitive Proportional Counter survey data and follow-up ROSAT observations obtained during the pointed phase. We subject these data to analysis with NLTE model atmospheres including continuous opacity from H, He, C, N and O. Our choices of surface gravity and abundances are constrained by optical data when known. We find that, although the general level of emission can be explained by photospheric emission from the hot stars, the fits are not particularly good or unique and are very model dependent. The best-fitting effective temperatures for the central stars are compared with those derived from other methods. Interstellar columns are compared with those we have obtained from new 21-cm emission line spectra.
Barstow Martin Adrian
Fleming Thomas Anthony
Hoare Melvin G.
Werner Klaus
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