VizieR Online Data Catalog: V2764 Ori and LkHa 301 long-term photometry (Zidarova+, 2022)

The V(RI)c photometric observations of the field of the McNeil's Nebula were carried out in the period from August 2004 to November 2021 with the 2-m Ritchey-Chretien-Coude (RCC) and the 50/70-cm Schmidt telescopes administered by the Rozhen National Astronomical Observatory (Bulgaria) and the 1.3-m Ritchey-Chretien (RC) telescope administered by the Skinakas Observatory of the University of Crete (Greece). Seven different CCD cameras were used to obtain the observations as follows: VersArray 1300B and Andor iKon-L BEX2-DD on the 2-m RCC telescope, Photometrics CH360 and Andor DZ436-BV on the 1.3-m RC telescope, and SBIG ST-8, SBIG STL-11000M and FLI PL16803 on the 50/70-cm Schmidt telescope. All frames were taken through a standard Johnson-Cousins (V(RI)c) set of filters. Twilight flat-fields in each filter were obtained every clear evening or morning. The frames acquired with the cameras on the 2-m RCC and the 1.3-m RC telescopes are bias-frame subtracted and flat-field corrected. The frames obtained with the cameras on the 50/70-cm Schmidt telescope are dark-frame subtracted and flat-field corrected. The photometric data were reduced using subroutine DAOPHOT in the IDL software package. As a reference sequence we used the V(RI)c comparisons reported in Semkov (2006IBVS.5683....1S). All data were analyzed using the same aperture, which was chosen to have a 5-arcsec radius and background annulus from 10-arcsec to 15-arcsec. The average value of the errors in the reported magnitudes is 0.01-0.02mag for the Ic and Rc band data and 0.01-0.03mag for the V band data.

(3 data files).