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Main-sequence variable stars in young open cluster NGC 1893

Show simple item record Lata, S. Yadav, R. K. Pandey, A. K. Richichi, Andrea Eswaraiah, C. Kumar, Brajesh Kappelmann, Norbert Sharma, Saurabh 2015-04-30T06:44:31Z 2015-04-30T06:44:31Z 2014-06-04
dc.description.abstract n 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 <1.0 d. 17 new class variables are located in the H − R diagram between the slowly pulsating B stars and δ Scuti variables. Pulsation could be one of the causes for periodic brightness variations in these stars. The X-ray emission of present main-sequence variables associated with the cluster lies in the saturated region of X-ray luminosity versus period diagram and follows the general trend by Pizzolato et al. en_US
dc.language.iso en_US en_US
dc.publisher Oxford en_US
dc.relation.ispartofseries mn442-273
dc.subject Stars: variables: general – open clusters and associations: individual. en_US
dc.title Main-sequence variable stars in young open cluster NGC 1893 en_US
dc.type Article en_US

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