论文标题
在Gaia调查中搜索ZZ CETI白矮人
Searching for ZZ Ceti White Dwarfs in the Gaia Survey
论文作者
论文摘要
{\ it gaia}卫星最近发布了$ \ sim $ 260,000高信心白矮人候选者的视差测量，允许精确测量其物理参数。通过将这些视差与Pan-stars和$ U $ - 频带光度法相结合，我们测量了北半球在100 parsecs of Sun的100 parsecs中的所有白色矮人的有效温度和出色的质量，并确定了所谓不稳定性带中的ZZ CETI白矮人候选者的样本。我们使用连接到Mont-Mégantic天文台的1.6 m望远镜上的香蒜仪摄像头获得了90个候选的高速光度观测值。我们报告发现38颗新ZZ CETI恒星，其中包括两个非常罕见的超质量脉动器。除了似乎没有显示任何光度变异性的47个对象外，我们还确定了条带内的5个可能的变量恒星。但是，其中几个可能是可变的，幅度低于我们的检测阈值，或者由于其光度参数的误差，可能位于不稳定条之外。根据我们的结果，我们探讨了$ m -t _ {\ rm eff} $平面中主要时期和振幅的趋势，并简要讨论了ZZ CETI不稳定性带的纯度问题（即没有不可变星的区域）。
The {\it Gaia} satellite recently released parallax measurements for $\sim$260,000 high-confidence white dwarf candidates, allowing for precise measurements of their physical parameters. By combining these parallaxes with Pan-STARRS and $u$-band photometry, we measured the effective temperature and stellar mass for all white dwarfs in the Northern Hemisphere within 100 parsecs of the Sun, and identified a sample of ZZ Ceti white dwarf candidates within the so-called instability strip. We acquired high-speed photometric observations for 90 candidates using the PESTO camera attached to the 1.6-m telescope at the Mont-Mégantic Observatory. We report the discovery of 38 new ZZ Ceti stars, including two very rare ultra-massive pulsators. We also identified 5 possibly variable stars within the strip, in addition to 47 objects that do not appear to show any photometric variability. However, several of those could be variable with an amplitude below our detection threshold, or could be located outside the instability strip due to errors in their photometric parameters. In the light of our results, we explore the trends of the dominant period and amplitude in the $M - T_{\rm eff}$ plane, and briefly discuss the question of the purity of the ZZ Ceti instability strip (i.e. a region devoid of non-variable stars).
