Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6065a&link_type=abstract
HST Proposal ID #6065
Physics
Hst Proposal Id #6065 Cool Stars
Scientific paper
With HST observations of a rare and fortuitous sample of 6 nearby Pleiades Moving Group members, we can define the (currently unknown) upper atmospheric structure of a cool star at the point of hydrogen ignition, many years before transition region and coronal spectroscopy can be done on the nearest cluster zero-age main-sequence (ZAMS) stars, the Pleiades early K dwarfs. The 6 target stars are so valuable because they comprise a homogeneous sample: all are between spectral types K0 V and K2 V, confirmed single, with log Li abundances between 2.5 and 3.2 (typical of Pleiades cluster K dwarfs), and U, V, W space motions consistent with the Pleiades Moving Group. Thus, the stars have the same age, mass, and temperature: the only variable is rotation, which ranges between 8 hr and 6.6 d. Because rotation is widely thought to be the controlling parameter governing atmospheric activity, semi-empirical Volume Emission Measure (VEM) modelling of the GHRS (and our EUVE) data will be used to address such fundamental questions as: 1) ZAMS atmospheric structure as a function of rotation; 2) the physical meaning of saturation; and 3) angular momentum loss (the spin-down process).
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