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HST/STIS spectroscopy of the exposed white dwarf in the short-period dwarf nova EK TrA | | B.T. Gaensicke
; P. Szkody.
; E.M. Sion
; D.W. Hoard
; S. Howell
; F.H. Cheng
; I. Hubeny
; | | Date: |
1 Jun 2001 | | Subject: | astro-ph | | Abstract: | We present high resolution Hubble Space Telescope ultraviolet spectroscopy of the dwarf nova EK TrA obtained in deep quiescence. The Space Telescope Imaging Spectrograph data reveal the broad Ly-alpha absorption profile typical of a moderately cool white dwarf, overlayed by numerous broad emission lines of He, C, N, and Si and by a number of narrow absorption lines, mainly of CI and SiII. Assuming a white dwarf mass in the range 0.3-1.4Msun we derive Teff=17500-23400K for the primary in EK TrA; Teff=18800K for a canonical mass of 0.6Msun. From the narrow photospheric absorption lines, we measure the white dwarf rotational velocity, v*sin i=200+-100kms. Even though the strong contamination of the photospheric white dwarf absorption spectrum by the emission lines prevents a detailed quantitative analysis of the chemical abundances of the atmosphere, the available data suggest slightly sub-solar abundances. The high time resolution of the STIS data allows us to associate the observed ultraviolet flickering with the emission lines, possibly originating in a hot optically thin corona above the cold accretion disk. | | Source: | arXiv, astro-ph/0106023 | | Services: | Forum | Review | PDF | Favorites | |
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