2009PASP..121.1188S -
Publ. Astron. Soc. Pac., 121, 1188-1204 (2009/November-0)
Periodic variables and gyrochronology in the open cluster NGC 2301.
SUKHBOLD T. and HOWELL S.B.
Abstract (from CDS):
We present the results of a search for periodic variables within 4078 time-series light curves and an analysis of the period-color plane for stars in the field of the open cluster NGC 2301. One hundred thirty-eight periodic variables were discovered, of which five are eclipsing binary candidates with unequal minima. The remaining 133 periodic variables appear to consist mainly of late-type stars whose variation is due to rotation modulated by star spot activity. The determined periods range from less than a day to over 14 days and have nearly unreddened colors in the range of 0.8 to 2.8. The Barnes interpretation of the period-color plane of late type stars is tested with our data. Our data did not show distinct I and C sequences, likely due to nonmember field stars contaminating in the background, as we estimate the total contamination to be 43%. Using different assumptions, the gyrochronological age of the cluster is calculated to be, which falls in the range of age values (164-250 Myr) determined by previous studies. Finally, we present evidence which nullifies the earlier suggestion that two of the variable stars in NGC 2301 might be white dwarfs.
Abstract Copyright:
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Journal keyword(s):
Star Clusters and Associations
VizieR on-line data:
<Available at CDS (J/PASP/121/1188): table2.dat>
Nomenclature:
Table 2: Cl* NGC 2301 HVT CNNNN, Cl* NGC 2301 HVT WNNNN N=119, Cl* NGC 2301 HVTSE NNNN N=14.
Simbad objects:
146
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