A triplet of the only pulsation mode detected in the DAV star G132–12  

作　　者：Wen-Chao Su Jian-Ning Fu Jian-Xing Chen Lester Fox-Machado Shi-Jie Zhao Carmen Ayala-Loera Jiang-Tao Wang Yang Pan 

机构地区：[1]Department of Astronomy,Beijing Normal University,Beijing 100012,China [2]Dipartimento di Fisica e Astronomia,Alma Mater Studiorum Universita’di Bologna,via Piero Gobetti 93/2,1-40129 Bologna,Italy [3]INAF-Osservatorio di Astrofisica e Scienze dello Spazio di Bologna,Via Piero Gobetti 93/31-40129 Bologna,Italy [4]Instituto de Astronomia,Universidad Nacional Autonoma de Mexico,Apartado Postal 877,22800 Ensenada,Baja California,Mexico [5]Institute of Astronomy&Astrophysics,Academia Sinica,Taipei,China

出　　处：《Research in Astronomy and Astrophysics》2021年第6期276-280,共5页天文和天体物理学研究（英文版）

基　　金：support from the National Natural Science Foundation of China(NSFC,Grant Nos.11833002,12090040 and 12090042);financial support of the UNAM(Grant PAPIIT IN100918)。

摘　　要：Hydrogen atmosphere pulsating white dwarfs,also known as DAV stars,are the most abundant type of pulsating white dwarfs.High-temperature DAV stars in general exhibit a small number of pulsation modes and stable frequencies.G132-12 is one of the pulsating hydrogen atmosphere white dwarf stars which lies close to the blue edge of the instability strip.Previous researches reported that G132-12 might have only one pulsation mode with the period of 212.69 s.To study the pulsation properties of G132-12 in detail,we carried out a bi-site observation campaign in October 2019.Time series photometric data were collected during around 154 h in total.A Fourier analysis reveals three frequencies which are identified as the triplet of an l=1 g-mode pulsation with the period of 212.499 s.The rotational period is derived as Prot=35.0±6.7 h and the inclination of the rotational axis to the line of sight is 70°.G132-12 could be an ideal target for measuring the cooling scale of this white dwarf star with only one excited pulsation mode detected.

关 键 词：white dwarfs OSCILLATIONS PHOTOMETRIC 

分 类 号：P145.5[天文地球—天体物理]