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Rotational Periods and Starspot Activity of Young Solar-Type Dwarfs in the Open Cluster IC 4665We present the results of a V-band photometric monitoring survey of 15 late-type dwarfs in the young open cluster IC 4665. Low-amplitude periodic light variations are found for 8 stars and ascribed to the modulation by starspots that cover typically a few percent of the stellar disk. Periods range from 0.6 to 3.7 d, translating to equatorial velocities between 13 and 93 km/s. That no period longer than 4 d was detected suggests a relative paucity of extremely slow rotators (V(sub eq) much less than 10 km/s) among late-type dwarfs in IC 4665. The fractional number of slow rotators in IC 4665 is similar to that of Alpha Per cluster, suggesting that IC 4665 is close in age to Alpha Per (approx. 50 Myr).
Document ID
19960022291
Document Type
Contractor Report (CR)
Authors
Allain, S. (Observatoire de Grenoble Grenoble, France)
Bouvier, J. (Observatoire de Grenoble Grenoble, France)
Prosser, C. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Marschall, L. A. (Gettysburg Coll. PA United States)
Laaksonen, B. D. (Gettysburg Coll. PA United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1995
Subject Category
Astrophysics
Report/Patent Number
NAS 1.26:200895
NASA-CR-200895
Funding Number(s)
CONTRACT_GRANT: NAGw-2698
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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NameType 19960022291.pdf STI