Identification of 13 Cepheids and 333 other variables in M 31

被引：33

作者：

Joshi, YC ^{[1
]}

Pandey, AK

Narasimha, D

Sagar, R

Giraud-Héraud, Y

机构：

[1] Uttar Pradesh State Observ, Naini Tal 263129, India

[2] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[3] Coll France, Phys Corpusculaire Lab, Lab Associe CNRS IN2P3, Ura 6411, F-75231 Paris, France

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 402卷 / 01期

关键词：

stars : variables : Cepheids; galaxies : individual : M 31; stars : supernovae : general;

D O I：

10.1051/0004-6361:20030136

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Cousins R and I band photometry of variable stars in a similar to13'x13'region in the disk of M31 galaxy, obtained during 141 nights. Of the 26 Cepheid variables present in the region, two are newly discovered, 11 are classified as Cepheids for the first time and 13 are confirmed as Cepheids. The extensive photometry of these Cepheids enabled us to determine precise phase and amplitude of pulsation which ranges from 0.11 to 0.48 mag in R band. The period of variability ranges from similar to7.5 to 56 days. The period-luminosity diagram is used to derive a distance modulus of 24.49+/-0.11 mag for M31 galaxy. We also report variability in 333 other stars, of them, 115 stars appear to be long period variables, 2 suspected eclipsing binaries and remaining 216 are irregular variables.

引用

页码：113 / 123

页数：11