arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.2322astro-ph.SR
收藏

ESO SN Ia始祖巡天观测到的白矮星的高分辨率UVES/VLT光谱。III。DA白矮星

High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey. III. DA white dwarfs

D. Koester, B. Voss, R. Napiwotzki, N. Christlieb, D. Homeier, T. Lisker, D. Reimers, U. Heber

摘要:

ESO超新星Ia始祖巡天(SPY)拍摄了1000多颗白矮星和前白矮星的高分辨率光谱。大约三分之二的恒星是氢主导的DA白矮星。在这里,我们提出了一个目录和详细的光谱分析的DA星的SPY。大气参数有效温度和地面重力正常DA确定。对双简并双星,即具有磁场或dM伴星的DA进行了分类和讨论。利用卡方拟合技术将这些光谱与理论模型大气进行了比较。我们的最终样本包含615个DA,它们在光谱中只显示氢的特征,尽管有些是双简并双星。187是新的检测或分类。我们还发现了10个磁性DA(4个新的)和46个DA+dM对(10个新的)。

英文摘要:

The ESO Supernova Ia Progenitor Survey (SPY) took high-resolution spectra of more than 1000 white dwarfs and pre-white dwarfs. About two thirds of the stars observed are hydrogen-dominated DA white dwarfs. Here we present a catalog and detailed spectroscopic analysis of the DA stars in the SPY. Atmospheric parameters effective temperature and surface gravity are determined for normal DAs. Double-degenerate binaries, DAs with magnetic fields or dM companions, are classified and discussed. The spectra are compared with theoretical model atmospheres using a chi^2 fitting technique. Our final sample contains 615 DAs, which show only hydrogen features in their spectra, although some are double-degenerate binaries. 187 are new detections or classifications. We also find 10 magnetic DAs (4 new) and 46 DA+dM pairs (10 new).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑