脉动热亚矮星气球090100001：2005年多地点活动的结果
The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign
摘要：
我们提出的脉动sdB星气球090100001上的多站点测光活动的结果。这颗恒星是两颗已知的混合热亚矮星之一，具有长周期和短周期振荡。该活动涉及八台望远镜，其中三台获得UBVR数据，四台获得B波段数据，一台获得Stromgren紫外比测光。该活动覆盖了48个夜晚，提供了0.36microHz的时间分辨率，B滤波器数据的检测阈值约为0.2mmag。Balloon 090100001在所有已知的脉动亚矮星B星中具有最丰富的脉动频谱，我们的分析检测到114个频率，包括97个独立频率和17个组合频率。在2.8mHz区域中最强的模式（f_1）最可能是径向的，而在该区域中的其余模式形成两个几乎对称的多重态：三重态和五重态，分别归因于旋转分裂的\ell =1和2模式。我们发现，在2004年和2005年的观测活动之间，分裂的两个多胞胎明显增加，平均达15%。观测到的分裂意味着Bal09的旋转速率取决于恒星纬度，并且在赤道上最快。我们使用一个小网格的模型来约束主模式（f_1），它最有可能代表径向基本脉动。p模频率的组似乎位于连续的径向泛音附近，直到第三个。尽管观察到大量的g模式频率，我们未能确定它们，最有可能是因为模式捕获的渐近行为的中断。然而，在地震分析方面，观测到的频率没有得到充分利用，未来应该用更大的热亚矮星可靠演化模型网格来进行地震分析。
英文摘要：
We present the results of a multisite photometric campaign on the pulsating sdB star Balloon 090100001. The star is one of the two known hybrid hot subdwarfs with both long- and short-period oscillations. The campaign involved eight telescopes with three obtaining UBVR data, four B-band data, and one Stromgren uvby photometry. The campaign covered 48 nights, providing a temporal resolution of 0.36microHz with a detection threshold of about 0.2mmag in B-filter data. Balloon 090100001 has the richest pulsation spectrum of any known pulsating subdwarf B star and our analysis detected 114 frequencies including 97 independent and 17 combination ones. The strongest mode (f_1) in the 2.8mHz region is most likely radial while the remaining ones in this region form two nearly symmetric multiplets: a triplet and quintuplet, attributed to rotationally split \ell=1 and 2 modes, respectively. We find clear increases of splitting in both multiplets between the 2004 and 2005 observing campaigns, amounting to 15% on average. The observed splittings imply that the rotational rate in Bal09 depends on stellar latitude and is the fastest on the equator. We use a small grid of models to constrain the main mode (f_1), which most likely represents the radial fundamental pulsation. The groups of p-mode frequencies appear to lie in the vicinity of consecutive radial overtones, up to the third one. Despite the large number of g-mode frequencies observed, we failed to identify them, most likely because of the disruption of asymptotic behaviour by mode trapping. The observed frequencies were not, however, fully exploited in terms of seismic analysis which should be done in the future with a larger grid of reliable evolutionary models of hot subdwarfs.
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。
