期刊
ASTRONOMY & ASTROPHYSICS
卷 471, 期 2, 页码 605-615出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20077179
关键词
stars : subdwarfs; stars : binaries : eclipsing; stars : general; stars : variables : general; stars : oscillations; stars : individual : PG1336-018
资金
- STFC [PP/D002370/1, PP/E001777/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E001777/1, PP/D002370/1] Funding Source: researchfish
Aims. We present an unbiased orbit solution and mass determination of the components of the eclipsing binary PG1336-018 as a critical test for the formation scenarios of subdwarf B stars. Methods. We obtained high-resolution time series VLT/UVES spectra and high-speed multicolour VLT/ULTRACAM photometric observations of PG1336-018, a rapidly pulsating subdwarf B star in a short period eclipsing binary. Results. Combining the radial velocity curve obtained from the VLT/UVES spectra with the VLT/ULTRACAM multicolour lightcurves, we determined numerical orbital solutions for this eclipsing binary. Due to the large number of free parameters and their strong correlations, no unique solution could be found, only families of solutions. We present three solutions of equal statistical significance, two of which are compatible with the primary having gone through a core He-flash and a common-envelope phase described by the alpha-formalism. These two models have an sdB primary of 0.466 M-circle dot and 0.389 M-circle dot, respectively. Finally, we report the detection of the Rossiter-McLaughlin effect for PG1336-018.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据