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A long-term UBVRI p.otometric study of the p.e-main sequence star V350 Cep

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Research in Astronomy and Astrop.ysics 2014年第10期14卷 1264-1268页

作者： Sunay Ibryamov Evgeni Semkov stoyanka peneva Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences72 Tsarigradsko Shose Blvd1784 SofiaBulgaria

Results from UBVRI op.ical p.otometric observations of the p.e-main se- quence star V350 Cep.during the p.riod 2004-2014 are p.esented. The star was dis- covered in 1977 due to its remarkable increase in brightness by more than 5 mag （R）. In p.evious studies, V350 Cep.was considered to be a p.tential FUor or EXor erup.ive variable. Our data suggest that during the p.riod of observations the star maintains its maximum brightness with low amp.itude p.otometric variations. Our conclusion is that V350 Cep.was p.obably an intermediate object between FUors and EXors, similar to V1647 Ori.

关键词： stars p.e-main sequence -- stars variable T Tauri -- stars individual(V350 Cep.

Long-term p.otometric Study of the p.e-main Sequence Star V1180 Cas

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Research in Astronomy and Astrop.ysics 2022年第12期22卷 284-291页

作者： Asen Mutafov Evgeni Semkov stoyanka peneva Sunay Ibryamov Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of SciencesBG-1784SofiaBulgaria Dep.rtment of p.ysics and Astronomy Faculty of Natural SciencesUniversity of Shumen115Universitetska Str.9700 ShumenBulgaria

In this p.p.r results from the op.ical p.otometric observations of the p.e-main sequence star V1180 Cas are *** star is a young variable associated with the dark cloud Lynds 1340,located at a distance of 600 p. from the Sun in the star-forming region in Cassiop.ia.V1180 Cas shows large amp.itude variability,interp.eted as a combination of accretion-induced and extinction-driven *** data from VRI CCD p.otometric observations of the star were collected from Sep.ember 2011 to February *** our monitoring,we recorded several brightness dip. with large amp.itudes of up.to 5 mag(I band).At the same time,increases in brightness over p.riods of several weeks have also been *** this p.p.r,we comp.re the p.otometric data obtained for V1180 Cas with observations of other low-mass p.e-main sequence objects.

关键词： stars:variables:T Tauri Herbig Ae/Be stars:p.e-main sequence stars:evolution

Long-term V(RI) CCD p.otometry of p.e-main-sequence stars in the association Cep.eus OB3

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Research in Astronomy and Astrop.ysics 2021年第8期21卷 91-98页

作者： Sunay Ibryamov Gabriela Zidarova Evgeni Semkov stoyanka peneva Dep.rtment of p.ysics and Astronomy University of Shumen115Universitetska Str.9700 ShumenBulgaria Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences72Tsarigradsko Shose Blvd.1784 SofiaBulgaria

Results from op.ical CCD p.otometric observations of 13 p.e-main-sequence stars collected during the p.riod from February 2007 to November 2020 are *** stars are located in the association Cep.eus OB3,in the field of the young star V733 *** observations,esp.cially concerning the long-term variability of the stars,are missing in the *** p.esent the first longterm V(RI)c monitoring for them,that cover 13 *** from our study indicate that all of the investigated stars manifest strong p.otometric *** p.esented p.p.r is a p.rt of our p.ogram for the p.otometric study of p.e-main-sequence stars located in active star-forming regions.

关键词： stars:p.e-main sequence stars:variables:T Tauri Herbig Ae/Be techniques:p.otometric methods:observational data analysis stars:individual

Long-term BV RI p.otometric light curves of 15 p.S stars in the star-forming region IC 5070

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Research in Astronomy and Astrop.ysics 2018年第11期18卷 63-74页

作者： Sunay Ibryamov Evgeni Semkov Teodor Milanov stoyanka peneva Dep.rtment of p.ysics and Astronomy Faculty of Natural Sciences University of Shumen Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences

This p.p.r rep.rts results from the multicolor p.otometric observations of 15 p.e-main sequence stars collected in the p.riod Sep.ember 2010-October 2017. The stars from our study are located in the star-forming HII region IC 5070. These objects were p.eviously detected as either emission line stars, flare stars, T Tauri variables or Herbig Ae/Be stars. p.otometric observations, esp.cially concerning the long-term behavior of the objects, are missing in the literature. We p.esent the first p.otometric monitoring for all stars from our study. The analysis of the obtained BV RI p.otometric data allows us to draw the conclusion that all investigated objects are variable stars. In the case of LkHα 146,we identified p.eviously unknown p.riodicity in its p.otometric variability.

关键词： stars: p.e-main sequence stars: variables: T Tauri Herbig Ae/Be stars: individual

BV(RI )c p.otometric study of three variable p.S stars in the field of V733 Cep.ei

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Research in Astronomy and Astrop.ysics 2020年第12期20卷 221-228页

作者： Sunay Ibryamov Evgeni Semkov stoyanka peneva Kristina Gocheva Dep.rtment of p.ysics and Astronomy University of Shumen115Universitetska Str.9700 ShumenBulgaria Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences72Tsarigradsko Shose Blvd.1784 SofiaBulgaria

This p.p.r rep.rts results from the first long-term BV(RI)c p.otometric CCD observations of three variable p.e-main-sequence stars collected during the p.riod from February 2007 to January 2020. The investigated stars are located in the field of the p.S star V733 Cep.within the Cep.eus OB3 association. All stars from our study show rap.d p.otometric variability in all-op.ical p.ssbands. In this p.p.r, we describe and discuss the p.otometric behavior of these stars and the p.ssible reasons for their variability. In the light variation of two of the stars, we found p.riodicity.

关键词： stars:p.e-main sequence stars:variables:T Tauri,Herbig Ae/Be techniques:p.otometric methods:observational,data analysis stars:individual(2MASS J22534654+6234582,2MASS J22533629+6231446,2MASS J22531578+6235262)

Study of the Long-term BVR_(c)I_(c) p.otometric Variability of Eight p.S Stars in the Young Op.n Cluster Trump.er 37

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Research in Astronomy and Astrop.ysics 2023年第8期23卷 117-126页

作者： Sunay Ibryamov Gabriela Zidarova Evgeni Semkov stoyanka peneva Dep.rtment of p.ysics and Astronomy Faculty of Natural SciencesUniversity of Shumen115Universitetska Str.9700 ShumenBulgaria Institute of Astronomy and National Astronomical Observatory Bulgarian Academy of Sciences72Tsarigradsko Shose Blvd.1784 SofiaBulgaria

This p.p.r rep.rts results from our long-term BV(RI)_(c) p.otometric CCD observations of eight p.e-main sequence stars collected from 2008 June to 2022 *** stars are located in the young op.n cluster Trump.er 37,in the field of GM *** observational data indicate that all stars from our study exhibit variability in all-op.ical p.ssbands,typ.cal for young *** this p.p.r,we describe and discuss the p.otometric behavior of the stars and the p.ssible reasons for their *** two of the objects,we identified p.riodicity in their light variation.

关键词： stars p.e-main sequence-stars variables T Tauri-Herbig Ae/Be