CoolCAT: An HST/STIS Echelle Survey of Ultraviolet Emissions from Late-Type Stars
Thomas Ayres (CASA
University of Colorado
Boulder, CO, USA)
CoolCAT is a UV spectral survey of late-type stars based on the rich HST/STIS archive, comprising about 50 more-or-less normal cool stars. Echelle-mode observations were used exclusively: 210 E140M's (1150-1700 Angstroms; 40,000 resolution), and 159 E230's (1700-3200 Angstroms), split as 61 medium-res (M: R=30,000) and 98 high-res (H: R=110,000). CoolCAT consists, primarily, of digital spectral atlases. A supporting catalog provides line identifications, wavelength centroids, Doppler widths, and fluxes. A wide range of investigations--from the photochemical evolution of primitive planetary atmospheres, the dynamics of cool star chromospheres, to galactic population synthesis--will be enabled by CoolCAT. Here, I focus on a key objective of the survey: transition-zone line-width and Doppler shift trends, a topic relevant to coronal heating. This is by far the largest stellar UV sample brought to bear on this problem to date.
This work was supported by grant HST-AR-09550.01-A.
http://casa.colorado.edu/~ayres/CoolCAT