β Cephei and new pulsating stars in NGC 4755

被引：11
|
作者：
Stankov, A [1 ]
Handler, G
Hempel, M
Mittermayer, P
机构：
[1] ESA, ESTEC, REs & Sci Support Dept, SCI SR, Noordwijk, Netherlands
[2] Univ Vienna, Inst Astron, A-1180 Vienna, Austria
[3] S African Astron Observ, ZA-7935 Cape Town, South Africa
[4] Univ Cape Town, Dept Phys, ZA-7701 Rondebosch, South Africa
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2002年 / 336卷 / 01期
关键词：
stars : individual : NGC 4755-F; stars : individual : NGC 4755-G; stars : individual : NGC 4755-I; stars : oscillations; stars : variables : other; open clusters and associations : individual : NGC 4755;
D O I：
10.1046/j.1365-8711.2002.05717.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the results of a photometric multi-colour, two-site observing campaign of beta Cephei stars in the young open cluster NGC 4755. More than 260 h of time-series U, B, V filter data of the cluster were acquired on two continents during 1999 and 2000. We list the detected pulsation frequencies and discuss the results of their analysis. Mode identification of the detected modes is performed as well. In addition, we present the detection of four new variable stars in NGC 4755. We give frequency solutions as indicators of the time-scales and amplitudes of the pulsations. NGC 4755-116 is probably a B2 dwarf with a period of 4.2 d whose variability is caused by a spot or g-mode pulsation. NGC 4755-405 can be considered as a new beta Cephei star with two pulsation frequencies. For NGC 4755-215 we found one frequency and for NGC 4755-316 three pulsation frequencies; we suggest that both are new slowly pulsating B stars of short period.
引用
收藏
页码：189 / 196
页数：8
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