Photometric study of the FUor star V 1735 Cyg (Elias 1-12)

Abstract

Results from optical photometric observations of the PMS star V 1735 Cyg are reported. On the basis of observed outburst and spectral properties, V 1735 Cyg was classified as a FUor object. We present data from IRVB CCD photometric observations of the star collected from Introduction V 1735 Cyg (Elias 1-12) was discovered by IRVB light curves of V 1735 Cyg in the period . The arrows mark the upper limits from photographic observations made with Palomar, Tonantzintla and Rozhen Schmidt telescopes Results and Discussion Using the collected data from photographic and CCD observations we try to construct the historical light curve of V 1735 Cyg and to study the photometric behavior of the star around the optical outburst and in the time of set in brightness. The analysis of the available photometric data for V 1735 Cyg leads to some important conclusions. The time of rise in brightness and the star magnitude in the maximum light are still under discussion. The data from photographic observations made with the 50/70-cm Schmidt telescope from 1986 to 1992 show a strong light variability (∆V = 1 m .2). Taking into account the magnitudes from We find the photometric studies of FUor and FUor-like objects as very important for their exact classification. The problems with duration and possible recurrence of FUor stage can by solved by collecting photometric data from the photographic plate archives and with photometric monitoring in the present time. Another disputed point that can be solved by photometric monitoring of star forming regions is the percentage of PMS stars passing through a FUor outburst. Acknowledgements