论文标题
短期变量星VII的omegawhite调查：高振幅，短期蓝色变量
The OmegaWhite Survey for Short-Period Variable Stars VII: High amplitude, short period blue variables
论文作者
论文摘要
蓝色大振幅脉动器（BLAPS）是一类相对较新的蓝色变量星，显示出其光曲线的周期性变化，其周期比几十分钟短，幅度比百分之十以上。我们报告了使用ESO的VST进行的Omegawhite调查中确定的九个蓝色可变星，该恒星在7-37分钟的范围内进行了定期调制，幅度为0.11-0.28 mag。我们已经获得了一系列主要使用盐和望远镜在SAAO上进行的随访光度法和光谱观测。我们发现四颗恒星，我们识别为空白，其中之一以前是已知的。 OW J0820--3301的一颗恒星似乎是V361 HYA脉动恒星类的成员，并且在空间上接近延伸的星云。另外一颗恒星OW J1819--2729具有类似于SDAV脉动器的特征。相比之下，OW J0815--3421是二进制恒星，其中含有SDB和白色矮人，轨道周期为73.7分钟，仅使其仅是六个白色矮人SDB二进制室之一，其轨道周期短于80分钟。最后，四个候选大容器的高节奏光度法显示出我们将其与较长时期的头脉冲脉动器中看到的凹槽状特征进行比较的特征。
Blue Large Amplitude Pulsators (BLAPs) are a relatively new class of blue variable stars showing periodic variations in their light curves with periods shorter than a few tens of mins and amplitudes of more than ten percent. We report nine blue variable stars identified in the OmegaWhite survey conducted using ESO's VST, which show a periodic modulation in the range 7-37 min and an amplitude in the range 0.11-0.28 mag. We have obtained a series of followup photometric and spectroscopic observations made primarily using SALT and telescopes at SAAO. We find four stars which we identify as BLAPs, one of which was previously known. One star, OW J0820--3301, appears to be a member of the V361 Hya class of pulsating stars and is spatially close to an extended nebula. One further star, OW J1819--2729, has characteristics similar to the sdAV pulsators. In contrast, OW J0815--3421 is a binary star containing an sdB and a white dwarf with an orbital period of 73.7 min, making it only one of six white dwarf-sdB binaries with an orbital period shorter than 80 min. Finally, high cadence photometry of four of the candidate BLAPs show features which we compare with notch-like features seen in the much longer period Cepheid pulsators.
