NOAO >   Observing Info >   Approved Programs >   2006B-0321

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Proposal Information for 2006B-0321


PI: Mark Giampapa, National Solar Observatory/NOAO, giampapa@noao.edu
Address: NSO, 950 N. Cherry Ave./POB 26732, Tucson, AZ 85726-6732, USA

CoI: William Sherry, NSO/NOAO

Title: Age-Activity Correlation at Young Stellar Ages

Abstract: We propose to utilize WIYN/Hydra to conduct a survey of the Ca II H & K resonance line profiles in the solar-type stars in the young (~ 100 Myr) Pleiades cluster. The results of this program will represent the first comprehensive survey of chromospheric Ca II strengths and line shapes in the young solar-type members of the Pleiades. We will use the measured chromospheric Ca II H&K line strengths to establish the empirical calibration between Ca II chromospheric emission and stellar age at young ages ~ 100 Myr. We will also directly compare the range of Ca II emission encountered in the young Pleiades sun-like stars to the range in variation of Ca II core emission seen in the contemporary Sun during the course of the modern solar cycle as well as to the results of our prior WIYN/Hydra survey of the solar-type stars in the solar-age cluster, M67. Finally, the results of the Pleiades survey will be compared to that obtained in our proposed Ca II survey of the solar-type stars in the intermediate- age cluster NGC 752 (1.8 Gyr). The combined results of these programs will yield an accurate calibration of the age-activity correlation, including the dispersion in this correlation due to the range of activity in sun-like stars at a given age, extending from cluster ages ~ 0.1 Gyr to ~ 4.5 Gyr. Finally, the intercomparison of the survey results for the Pleiades, NGC 752, M67, and the Sun, will yield quantitative insight on the evolution of the ranges in cycle-related chromospheric activity from ~ 100 Myr to solar age.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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