Long-Term Variability Survey of the Old Open Cluster NGC 6791 | Zendy

B. J. Mochejska | Zendy; K. Z. Stanek | Zendy; J. Kałużny | Zendy

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Long-Term Variability Survey of the Old Open Cluster NGC 6791

Author(s) -

B. J. Mochejska,

K. Z. Stanek,

J. Kałużny

Publication year - 2003

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/374993

Subject(s) - physics , astrophysics , dwarf nova , variable star , open cluster , cataclysmic variable star , light curve , stars , term (time) , cluster (spacecraft) , astronomy , white dwarf , computer science , programming language

We present the results of a long-term variability survey of the old opencluster NGC 6791. The BVI observations, collected over a time span of 6 years,were analyzed using the ISIS image subtraction package. The main target of ourobservations were two cataclysmic variables B7 and B8. We have identifiedpossible cycle lenghts of about 25 and 18 days for B7 and B8, respectively. Wetentatively classify B7 as a VY Scl type nova-like variable or a Z Cam typedwarf nova. B8 is most likely an SS Cygni type dwarf nova. We have alsoextracted the light curves of 42 other previously reported variable stars anddiscovered seven new ones. The new variables show long-period or non-periodicvariability. The long baseline of our observations has also allowed us toderive more precise periods for the variables, especially for the short periodeclipsing binaries.Comment: 13 pages LaTeX, including 8 PostScript figures and 4 tables. To appear in June 2003 issue of The Astronomical Journa

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