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arXiv 0802.2022astro-ph
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灾变变星的远紫外档案研究:I。矮新星系统中暴露的白矮星的FUSE和HST/STIS光谱

A Far Ultraviolet Archival Study of Cataclysmic Variables: I. FUSE and HST/STIS Spectra of the Exposed White Dwarf in Dwarf Nova Systems

P. Godon, E. M. Sion, P. E. Barrett, I. Hubeny, A. P. Linnell, P. Szkody

摘要:

本文综合分析了静止期期间5颗矮新星的远紫外光谱探测器(FUSE)和哈勃空间望远镜/空间望远镜成像光谱仪(HST/STIS)光谱。我们使用我们的合成光谱代码,包括选项的氢准分子卫星线(低温恒星大气),NLTE近似(高温恒星大气)的治疗,并为一个系统(RU Peg),我们模型的星际介质(ISM)的分子和原子氢线。在这里介绍的所有系统中,FUV通量连续体是由于WD。这些光谱还表现出一些宽的发射线。在这项工作中,我们确认了一些以前的FUV分析结果,但我们也提出了新的结果。对于4个系统,我们结合了FUSE和STIS光谱,以覆盖更大的波长范围并改善光谱拟合。这项工作是我们更广泛的HST档案研究计划的一部分,在该计划中,我们的目标是通过结合FUSE和HST FUV光谱,为周期间隙以上和以下的灾难变量提供准确的系统参数。

英文摘要:

We present a synthetic spectral analysis of Far Ultraviolet Spectroscopic Explorer (FUSE) and Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectra of 5 dwarf novae above and below the period gap during quiescence. We use our synthetic spectral code, including options for the treatment of the hydrogen quasi-molecular satellite lines (for low temperature stellar atmospheres), NLTE approximation (for high temperature stellar atmospheres), and for one system (RU Peg) we model the interstellar medium (ISM) molecular and atomic hydrogen lines. In all the systems presented here the FUV flux continuum is due to the WD. These spectra also exhibit some broad emission lines. In this work we confirm some of the previous FUV analysis results but we also present new results. For 4 systems we combine the FUSE and STIS spectra to cover a larger wavelength range and to improve the spectral fit. This work is part of our broader HST archival research program, in which we aim to provide accurate system parameters for cataclysmic variables above and below the period gap by combining FUSE and HST FUV spectra.

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