Photometric study of ROTSE-I Delta Scuti type variable stars

S.-L. Kim1, H. Jin1, S.-G. Kwon1, C.-U. Lee1, J.-H. Youn1, H. Lee2
1 Korea Astronomy Observatory, Daejon, 305-348, Korea
2 Department of Earth Science Education, Korea National University of Education, Choongbuk, 363-791, Korea

 

The Robotic Optical Transient Search Experiment (ROTSE), a famous gamma-ray burst observing group, discovered a number of new variable stars using the ROTSE-I instruments (Akerlof et al. 2000, AJ, 119, 1901). Among their 1781 periodic variable stars, a total of 91 Delta Scuti type pulsating stars had been identified.
We performed VI CCD photometry of 10 ROTSE-I Delta Scuti type stars. From the comparison of amplitudes in V and I passbands, we re-classified their variable types. Most of ROTSE-I Delta Scuti type stars which did not show typical pulsating light curves (steep increasing, slow decreasing and sharp maximum brightness), turned out to be W UMa type eclipsing binary stars.

 
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