We present a synthetic spectral analysis of the HST COS spectrum of the U Geminorum-type dwarf nova CW Mon, taken during quiescence as part of our COS survey of accreting white dwarfs in Cataclysmic Variables. We use synthetic photosphere and optically thick accretion disk spectra to model the COS spectrum as well as archival IUE spectra obtained decades ago when the system was in an even deeper quiescent state. Assuming a reddening of E(B-V)=0.06, an inclination of 60° (CW Mon has eclipses of the accretion disk, and a white dwarf mass of 0.8M⊙, our results indicate the presence of a 22-27,000 K white dwarf and a low mass accretion rate [Formula: see text], for a derived distance o ~200 to ~300 pc.

中文翻译：

---

矮新星 CW 星期一的哈勃 COS 光谱：静止的白矮星？

我们展示了双子座型矮新星 CW Mon 的 HST COS 光谱的合成光谱分析，该光谱是在静止期间拍摄的，作为我们对巨变变量中吸积白矮星的 COS 调查的一部分。我们使用合成光球和光学厚吸积盘光谱来模拟 COS 光谱以及几十年前系统处于更深静止状态时获得的存档 IUE 光谱。假设红化 E(BV)=0.06，倾角为 60°（CW Mon 有吸积盘的日食，白矮星质量为 0.8M⊙，我们的结果表明存在一颗 22-27,000 K 的白矮星和低质量吸积率 [公式：见正文]，导出距离 o ~200 到 ~300 pc。