在SALT巡天中利用{\it TESS}搜索贫氢恒星中的密近双星系统
A search for close binary systems in the SALT survey of hydrogen-deficient stars using {\it TESS}
AI总结：
利用TESS数据在SALT巡天贫氢恒星中搜索密近双星，发现16颗变星中6颗为真变星，其中1颗为已知密近双星，密近双星比例在中性氦热亚矮星中约3.5%，在极端氦亚矮星中为0%。
摘要：
我们对SALT巡天目录中贫氢恒星的{\it TESS}周期图进行了搜索，以寻找短周期变率的证据。在153个目录天体中，有16颗恒星被识别出具有周期性的光变曲线变化，其中10颗为假阳性。在剩余的6颗已确认变星中，Ton S 415是一个已知的密近双星系统，也是第六个包含贫氢热亚矮星的密近双星。视向速度和SED分析排除了其余5颗为密近双星系统的可能性；它们变率的成因仍不确定。BPS CS 22956-0094可能是一个宽双星或三合星系统，其伴星为一颗或多颗K型星。从该SALT+{\it TESS}样本来看，中等氦热亚矮星中密近双星的比例为$1/29 \approx 3.5\\%$，而极端氦亚矮星中密近双星的比例为$0/124 = 0\\%$。
英文摘要：
The {\it TESS} periodograms of the SALT survey catalogue of hydrogen-deficient stars were searched for evidence of short-period variability. Periodic light curve variations were identified in 16 stars out of 153 catalogue objects, of which 10 were false positives. From the remaining 6 identified variables, Ton S 415 is a known close binary system and the sixth close binary containing a hydrogen-deficient hot subdwarf. Radial velocity and SED analyses ruled out the remaining 5 as close binary systems; the causes of their variability remain uncertain. With one or more K-type companions, BPS CS 22956-0094 may be a wide binary or triple. From this SALT+{\it TESS} sample, the fraction of close binaries stands at $ 1/29 \approx 3.5\%$ for intermediate helium hot subdwarfs and $0/124 = 0\%$ for extreme helium 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。
