论文标题
脉动氦气 - 大气白矮人I：Sloan数字天空调查的新DBV
The Pulsating Helium-Atmosphere White Dwarfs I: New DBVs from the Sloan Digital Sky Survey
论文作者
论文摘要
我们使用麦当劳（McDonald）2.1亿Otto Struve望远镜进行了专门的搜索，以搜索Sloan Digital Sky调查的新型脉动氦气 - 大气（DBV）白矮星。我们总共观察到55 dB和DBA白矮人，光谱温度在19,000至35,000k之间。我们发现了19个新的DBV，并在其余36个对象的可变性上放置上限。结合先前已知的DBV，我们使用这些对象为DB不稳定性带的经验范围提供了更新。有了我们的新DBV样本，红色边缘受到了更好的限制，因为我们几乎是已知的20,000至24,000k之间的DBV数量的两倍。 We do not find any new DBVs hotter than PG 0112+104, the current hottest DBV at $T_{\mathrm{eff}}\,{\approx}$ 31,000K, but do find pulsations in four DBVs with temperatures between 27,000 and 30,000K, improving empirical constraints on the poorly defined blue edge.我们研究了所有当前已知的DBV的集合脉动特性，发现加权平均周期和总脉动功率具有有效温度的趋势，其质量与脉动氢 - 大气中的白色矮人在质量上相似。
We present a dedicated search for new pulsating helium-atmosphere (DBV) white dwarfs from the Sloan Digital Sky Survey using the McDonald 2.1m Otto Struve Telescope. In total we observed 55 DB and DBA white dwarfs with spectroscopic temperatures between 19,000 and 35,000K. We find 19 new DBVs and place upper limits on variability for the remaining 36 objects. In combination with previously known DBVs, we use these objects to provide an update to the empirical extent of the DB instability strip. With our sample of new DBVs, the red edge is better constrained, as we nearly double the number of DBVs known between 20,000 and 24,000K. We do not find any new DBVs hotter than PG 0112+104, the current hottest DBV at $T_{\mathrm{eff}}\,{\approx}$ 31,000K, but do find pulsations in four DBVs with temperatures between 27,000 and 30,000K, improving empirical constraints on the poorly defined blue edge. We investigate the ensemble pulsation properties of all currently known DBVs, finding that the weighted mean period and total pulsation power exhibit trends with effective temperature that are qualitatively similar to the pulsating hydrogen-atmosphere white dwarfs.
