The Photospheric Properties of the Underlying White Dwarf in the Nova-like Variable TT ARIETIS during its 1983 Low State

Details The Photospheric Properties of the Underlying White Dwarf in the Nova-like Variable TT ARIETIS during its 1983 Low State The Photospheric Properties of the Underlying White Dwarf in the Nova-like Variable TT ARIETIS during its 1983 Low State

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.7910f&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #79.10; Bulletin of the American Astronomical Society, Vol. 27, p.1399

Astronomy and Astrophysics

Astronomy

Scientific paper

During 1983, TT Arietis entered a low state of visual magnitude 16 during which accretion declined to an extremely low level and the underlying white dwarf accreter was exposed both in the optical (e.g. the Stark-broadened wings of He II 4686dot {A}) and in the far ultraviolet (Shafter et al. 1985, ApJ, 290, 707). We have analyzed the low resolution IUE SWP spectra of TT Ari obtained during this low state with a grid of high gravity, solar composition model atmospheres convolved with IUE resolution, constructed with TLUSTY and SYNSPEC (Hubeny 1988, Comput.Phys.Comm. 52, 103; Hubeny 1995, TLUSTY and SYNSPEC USERS MANUAL, in press). We present the resulting photospheric parameters of the hot white dwarf, preliminary abundances of its accreted atmosphere, and a quantitative constraint on its global rotational velocity. This work has been supported by NASA LTSA grant NAGW-3726 and by a summer research grant from the NASA Delaware Space Grant Colleges Consortium.

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