Hot high-gravity NLTE model atmospheres as soft X-ray sources.

Details Hot high-gravity NLTE model atmospheres as soft X-ray sources. Hot high-gravity NLTE model atmospheres as soft X-ray sources.

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...322..591h&link_type=abstract

Astronomy and Astrophysics, v.322, p.591-597

Astronomy and Astrophysics

Astrophysics

31

Stars: Atmospheres, Accretion, Radiative Transfer, White Dwarfs, X-Rays: Stars

Scientific paper

Hot optically thick plasmas in the temperature range 10^5^=9, i.e. for the most massive white dwarfs (M>=0.6Msun_). At these gravities the density is sufficiently high to assume that collisional ionizations dominate and that LTE determines the degree of ionizations and the atomic population levels. We show fits of H, He, C, N, O, Ne NLTE model atmospheres to observed ROSAT spectra of Supersoft Sources (SSS) in the Galaxy and the LMC. The resulting effective temperatures strongly depend on the assumed model parameters, such as the gravity and the metallicities. With the present X-ray spectral resolution, temperature, gravity and abundances cannot be determined independently.

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