Other
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2218f&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #22.18; Bulletin of the American Astronomical Society, Vol. 27, p.844
Other
Scientific paper
As part of our ongoing program to study Li abundance in stars of known ages, we have obtained high-resolution echelle spectra for 41 members of the open cluster M34 using the Keck telescope. We use these spectra to derive rotational velocities (vsini), and equivalent widths of Li, H alpha and the Ca II infrared triplet lines in order to assess the correlation of rotation, Li abundance and chromospheric activity with age. The observations of M34 members are compared with previous observations of Pleiades and Hyades members. M34 (~ 200 Myr) is intermediate in age between the Pleiades ( ~ 65 Myr) and the Hyades (~ 800 Myr). Previous observations have demonstrated a wide range in rotation among late-G and K dwarfs in the Pleiades. By contrast, stars of a similar spectral type in the Hyades show little variation in their rotation rates. This suggests that convergence in rotation rates among stars of a particular spectral type is an evolutionary effect. Previous observations have also indicated a correlation between rotation and chromospheric activity in Pleiades stars. Another difference between the Pleiades and Hyades clusters has been in the measured lithium abundance for stars of a particular effective temperature. The Pleiades stars show a large degree of scatter while the Hyades stars show little difference in lithium abundance. The observations of stars in M34 provide a check on the correlation of these features with age. Like the Pleiades, the M34 members show a dispersion in Li abundance among low mass stars and also a substantial spread in rotational velocities.
David Soderblom R.
Fischer Debra
Jones Burton F.
Shetrone Mathew D.
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