SIMBAD references

Time-series CCD photometric observations of an intermediate age open cluster NGC 2301 were performed to search for variable stars, particularly γ Dor stars and δ Sct stars. We also carried out UBVI photometry to study physical properties of variable stars in the cluster. We derived observational parameters of the cluster from UBVI photometric results. The best fit of the empirical ZAMS in a color-color diagram gives a reddening value of E(B-V)=0.05±0.03. We also estimated a distance modulus of (V-M_V)₀=9.6±0.1 and an age of logt=8.4±0.1, from the ZAMS and isochrone fitting in a color-magnitude diagram. Using V time-series data, we carefully examined light variations of 923 stars fainter than 10.0mag and discovered nine short-period variable stars; two γ Dor candidates, five eclipsing binaries, one Slowly Pulsating B star and one magnetic Chemically Peculiar variable candidate. Two γ Dor candidates with relatively short periods of around 0.3 days are located in a redder region (about 0.1mag in B-V color) than the red edge of δ Sct instability strip in the color-magnitude diagram.