VizieR Online Data Catalog: Long-term UBVRI photometry of GM Cep (Semkov+, 2015)
Abstract
UBVRI photometric data of GM Cephei during the period from June 2008 to August 2014 are presented. The CCD observations were performed in two observatories, with four telescopes. These are the 2-m Ritchey-Chretien-Coude (RCC), the 50/70-cm Schmidt and the 60-cm Cassegrain telescopes of the Rozhen National Astronomical Observatory of the Bulgarian Academy of Sciences and the 1.3-m Ritchey-Chretien (RC) telescope of the Skinakas Observatory of the University of Crete (Greece).
The observations were performed with five different types of CCD cameras - VersArray 1300B at the 2-m RCC telescope; ANDOR DZ436-BV at the 1.3-m RC telescope; SBIG STL-11000M and FLI PL16803 at the 50/70-cm Schmidt telescope; and FLI PL09000 at the 60-cm Cassegrain telescope. All frames were taken through a standard Johnson-Cousins set of filters. The photometric data were reduced by IDL package (standard subroutine DAOPHOT). As references, we used the comparison sequence of fifteen stars in the field around GM Cep, published in Semkov & Peneva (2012Ap&SS.338...95S). All data were analyzed using the same aperture, which was chosen to have a 6-arcsec radius, while the background annulus was taken from 10-arcsec to 15-arcsec. The mean value of the errors in the reported magnitudes are: 0.01-0.02mag for I- and R-band data, 0.01-0.03mag for V-band data, 0.01-0.05mag for B-band data and 0.04-0.08mag for U-band data. The BVRI photometric data, obtained in the period from June 2008 to February 2011 are presented in Semkov & Peneva (2012Ap&SS.338...95S). (1 data file).- Publication:
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VizieR Online Data Catalog (other)
- Pub Date:
- April 2015
- Bibcode:
- 2015yCatp019003201S
- Keywords:
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- Stars: variable;
- Stars: pre-main sequence;
- Photometry: UBVRI