V391 Peg：根据ULTRACAM u 'g'r'振幅识别两种主要脉动模式
V391 Peg: identification of the two main pulsation modes from ULTRACAM u'g'r' amplitudes
摘要：
V391 Peg（HS 2201 +2610）是一颗极水平分支亚矮星B（sdB），它是一颗具有p-和g-模式振荡的混合型变星，拥有一颗3.2/sini M_Jup的行星，其轨道距离约为1.7 AU。为了改善恒星的特性，我们测量的脉动振幅在u 'g'r' SLOAN光度带使用ULTRACAM在威廉赫歇尔4.2米望远镜，我们将它们与理论值进行了比较。本文给出的初步结果表明，在349.5和354.1 s处的两个主脉动周期分别为径向和偶极模式。这是第一次，多个模式的度指数已被唯一确定的sdB星一样微弱的V391 Peg（B=14.4），证明了测光绝对是一个有效的技术，以限制模式识别，提供了足够高的数据质量。
英文摘要：
V391 Peg (HS2201+2610) is an extreme horizontal branch subdwarf B (sdB) star, it is an hybrid pulsator showing p- and g-mode oscillations, and hosts a 3.2/sini M_Jup planet at an orbital distance of about 1.7 AU. In order to improve the characterization of the star, we measured the pulsation amplitudes in the u'g'r' SLOAN photometric bands using ULTRACAM at the William Herschel 4.2 m telescope and we compared them with theoretical values. The preliminary results presented in this article conclusively show that the two main pulsation periods at 349.5 and 354.1 s are a radial and a dipole mode respectively. This is the first time that the degree index of multiple modes has been uniquely identified for an sdB star as faint as V391 Peg (B=14.4), proving that multicolor photometry is definitely an efficient technique to constrain mode identification, provided that the data have a high enough quality.
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