... Institute of Observational Sciences, Manora Peak, Nainital 263002, Uttarakhand, India .... open cluster NGC 3766 found large population of new variable stars between .... is operated by the Association of Universities for Research in Astron-.
MNRAS 442, 273–284 (2014)
doi:10.1093/mnras/stu726
Main-sequence variable stars in young open cluster NGC 1893 Sneh Lata,1‹ Ram Kesh Yadav,1 A. K. Pandey,1 Andrea Richichi,2 C. Eswaraiah,1,3 Brajesh Kumar,1,4 Norbert Kappelmann5 and Saurabh Sharma1 1 Aryabhatta
Research Institute of Observational Sciences, Manora Peak, Nainital 263002, Uttarakhand, India Astronomical Research Institute of Thailand, 191 Siriphanich Bldg., Huay Kaew Rd., Suthep, Muang, Chiang Mai 50200, Thailand 3 Institute of Astronomy, National Central University, 300 Jhongda Rd, Jhongli, Taoyuan Country 32054, Taiwan 4 Institut d’Astrophysique et de G´ eophysique, Universit´e de Li`ege, All´ee du 6 Aoˆut 17, Bˆat B5c, 4000 Li`ege, Belgium 5 Institute of Astronomy and Astrophysics, Sand 1, D-72076 T¨ ubingen, Germany 2 National
Accepted 2014 April 9. Received 2014 March 28; in original form 2014 February 10
ABSTRACT
In this paper, we present time series photometry of 104 variable stars in the cluster region NGC 1893. The association of the present variable candidates to the cluster NGC 1893 has been determined by using (U − B)/(B − V) and (J − H)/(H − K) two colour diagrams, and V/(V − I) colour–magnitude diagram. 45 stars are found to be main-sequence variables and these could be B-type variable stars associated with the cluster. We classified these objects as β Cep, slowly pulsating B stars and new class variables as discussed by Mowlavi et al. These variable candidates show ∼0.005 to ∼0.02 mag brightness variations with periods of
