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PHOTOMETRIC PROPERTIES OF FOUR NEW VARIABLE STARS IN THE VICINITY OF BR CAM
S.-L. KIM,C.-U. LEE,J. W. LEE,J. A. LEE,강용범,구재림,G. VAUCLAIR 한국천문학회 2004 Journal of The Korean Astronomical Society Vol.37 No.5
We present photometric results for four new variable stars discovered in the vicinity of the ZZ Ceti- type pulsating white dwarf BR Cam. Observations were performed on 5 nights in November 2003 using the 1.8m telescope at Bohyunsan Optical Astronomy Observatory with no ¯lter, on 3 nights in December 2003 using the 0.61m telescope at Sobaeksan Optical Astronomy Observatory with V; I ¯lters, and on 3 nights in October 2004 using the 1.0m telescope at Mt. Lemmon Optical Astronomy Observatory with V; I ¯lters. We estimated their periods from the phase-match technique for one eclipsing binary and the multiple frequency analysis for three pulsating stars. By considering the light curve shape, period and amplitude di®erence between two passbands, we classi¯ed the objects by their variability types as follows: V1 (USNO-A2.0 1425-05691757) is a W UMa-type eclipsing binary with an orbital period of 0:d 4641; V2 (USNO-A2.0 1425-05703335) is a multi-periodic ± Sct-type pulsating star with a dominant period of 0:d 0649; V3 (USNO-A2.0 1425-05699659) is also a ± Sct-type pulsating star with a period of 0:d 1408; and V4 (USNO-A2.0 1425-05707705) is a RR Lyr-type pulsating star with a period of 0:d 2643. We present photometric results for four new variable stars discovered in the vicinity of the ZZ Ceti-type pulsating white dwarf BR Cam. Observations were performed on 5 nights in November 2003 usingthe 1.8m telescope at Bohyunsan Optical Astronomy Observatory with no lter, on 3 nights in December2003 using the 0.61m telescope at Sobaeksan Optical Astronomy Observatory withV;Ilters, and on 3nights in October 2004 using the 1.0m telescope at Mt. Lemmon Optical Astronomy Observatory withV;I lters. We estimated their periods from the phase-match technique for one eclipsing binary andthe multiple frequency analysis for three pulsating stars. By considering the light curve shape, periodand amplitude dierence between two passbands, we classied the objects by their variability types asfollows: V1 (USNO-A2.0 1425-05691757) is a W UMa-type eclipsing binary with an orbital period of0:d4641; V2 (USNO-A2.0 1425-05703335) is a multi-periodic δ Sct-type pulsating star with a dominantperiod of 0:d0649; V3 (USNO-A2.0 1425-05699659) is also a δ Sct-type pulsating star with a period of0:d1408; and V4 (USNO-A2.0 1425-05707705) is a RR Lyr-type pulsating star with a period of 0:d2643.
PHOTOMETRIC PROPERTIES OF FOUR NEW VARIABLE STARS IN THE VICINITY OF BR CAM
KIM S.-L.,LEE C.-D.,LEE J. W.,LEE J. A.,KANG Y.B.,KOO J.-R.,VAUCLAIR G. The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.4
We present photometric results for four new variable stars discovered in the vicinity of the ZZ Ceti-type pulsating white dwarf BR Cam. Observations were performed on 5 nights in November 2003 using the 1.8m telescope at Bohyunsan Optical Astronomy Observatory with no filter, on 3 nights in December 2003 using the 0.61m telescope at Sobaeksan Optical Astronomy Observatory with V, I filters, and on 3 nights in October 2004 using the 1.0m telescope at Mt. Lemmon Optical Astronomy Observatory with V, I filters. We estimated their periods from the phase-match technique for one eclipsing binary and the multiple frequency analysis for three pulsating stars. By considering the light curve shape, period and amplitude difference between two passbands, we classified the objects by their variability types as follows: V1 (USNO-A2.0 1425-05691757) is a W UMa-type eclipsing binary with an orbital period of $0^d.4641$; V2 (USNO-A2.0 1425-05703335) is a multi-periodic $\delta$ Set-type pulsating star with a dominant period of $0^d.0649$; V3 (USNO-A2.0 1425-05699659) is also a $\delta$ Set-type pulsating star with a period of $0^d.1408$; and V 4 (USNO-A2.0 1425-05707705) is a RR Lyr-type pulsating star with a period of $0^d.2643$.