BVRI CCD-photometry of comparison stars in the fields of active galaxies. Vстатья
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Дата последнего поиска статьи во внешних источниках: 26 мая 2016 г.
Аннотация: Results of the CCD BVRI observations of 79 comparison stars in the fields of seven Seyfert galaxies (Akn 79, Mrk 374, Mrk 382, Mrk 478, Mrk 493, Mrk 618 and Mrk 1513), as well as quasar CTA 102 are presented. The BVRI magnitudes of the majority of selected stars have not been known before. These results can be used for the differential photometry of AGN.
A variable star with the period P=0.1705 days was detected in the field of Mrk 478, and a star which changed its brightnes with the period P=0.2211 days was found in the field of Mrk 1513. It is possible, these stars belong to the contact binaries W UMa-type stars with the orbital periods P=0.341 and P=0.4422 days, respectively.