Variable stars in a Field of the Old Open Cluster M67: Photometric Precision of the BOAO 1.8m Telescope

Details Variable stars in a Field of the Old Open Cluster M67: Photometric Precision of the BOAO 1.8m Telescope Variable stars in a Field of the Old Open Cluster M67: Photometric Precision of the BOAO 1.8m Telescope

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jkas...29...43k&link_type=abstract

Journal of the Korean Astronomical Society, vol. 29, no. 1, p. 43-51

Astronomy and Astrophysics

Astronomy

5

M67, Open Cluster, Variable, Photometry

Scientific paper

We present test results of time-series CCD photometry to investigate the photometric precision of the BOAO (Bohyunsan Optical Astronomy Observatory) 1.8m telescope. A well-known field of the old open cluster M67, which includes two pulsating blue stragglers and two W UMa type binaries, was monitored for 3.5 hours on February 22, 1996. We have collected 148 V frames and 3 B frames. Photometric noises which consist mainly of photon noise and scintillation noise, were lowered down to about 1.9 mmag for stars of 10.5 mag in M67 with exposure time of 20 seconds. From the C-M diagram for M67, a number of observational properties were derived; E(B-V) = 0.03, (V-Mv)o = 9.6 = 9.6, Age = 4 Gyr. We obtained light curves for four known variable stars and confirmed their variational characteristics. The pulsating blue stragglers show a low amplitude (about 0.01 mag) of light variation.

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