论文标题
在苔丝的头三年发现了74个新的ZZ CETI明星
Discovery of 74 new bright ZZ Ceti stars in the first three years of TESS
论文作者
论文摘要
我们从从部门1到39的传输系外行星调查卫星（TESS）任务获得的数据报告了74个新的脉动DA白矮星或ZZ Cetis，与前3个周期相对应。其中包括来自南半球（部门1-13和27-39）和北半球（部门14-26）的物体，观察到120 s-和20 s-cadence。我们的样本可能包括13个低质量和一个极低的白色矮人候选者，考虑到拟合Gaia幅度和视差的质量确定。此外，我们提出了从地面望远镜的11个对象的后续时间序列光度法，这使我们能够检测到大量的周期。对于每个对象，我们分析了周期光谱并进行了Asterosemological分析，并估计样品的结构参数，即恒星质量，有效温度和氢包膜质量。我们估计<msis> _〜0.635 +/- 0.015 MSUN的平均星星学质量质量，不包括候选者低或极低的质量对象。该值与GAIA数据中的估计值相一致，GAIA数据的估计值是<mphot> 〜0.631 +/- 0.040 msun，以及<m*> = 0.644 +/- 0.034 msun的先前已知ZZ CETIS的平均质量。我们的74个新的Bright Zz〜CETIS样本将已知Zz〜CETIS的数量增加$ \ sim $ 20％。
We report the discovery of 74 new pulsating DA white dwarf stars, or ZZ Cetis, from the data obtained by the Transiting Exoplanet Survey Satellite (TESS) mission, from Sectors 1 to 39, corresponding to the first 3 cycles. This includes objects from the Southern Hemisphere (Sectors 1-13 and 27-39) and the Northern Hemisphere (Sectors 14-26), observed with 120 s- and 20 s-cadence. Our sample likely includes 13 low-mass and one extremely low-mass white dwarf candidate, considering the mass determinations from fitting Gaia magnitudes and parallax. In addition, we present follow-up time series photometry from ground-based telescopes for 11 objects, which allowed us to detect a larger number of periods. For each object, we analysed the period spectra and performed an asteroseismological analysis, and we estimate the structure parameters of the sample, i.e., stellar mass, effective temperature and hydrogen envelope mass. We estimate a mean asteroseismological mass of <Msis>_~ 0.635 +/-0.015 Msun, excluding the candidate low or extremely-low mass objects. This value is in agreement with the mean mass using estimates from Gaia data, which is <Mphot> ~ 0.631 +/- 0.040 Msun, and with the mean mass of previously known ZZ Cetis of <M*>= 0.644 +/-0.034 Msun. Our sample of 74 new bright ZZ~Cetis increases the number of known ZZ~Cetis by $\sim$20 per cent.
