The Transition Regions of X-Ray Emitting Main-Sequence A Stars

Details The Transition Regions of X-Ray Emitting Main-Sequence A Stars The Transition Regions of X-Ray Emitting Main-Sequence A Stars

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1812g&link_type=abstract

IUE Proposal ID #CCGMG

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Scientific paper

We propose to obtain low dispersion, large aperture SWP and high dispersion, large aperture LWR observations of two (2) X-ray emitting, single main-sequence A stars:: HR 7160 (A8V, log Lx = 29) and HD 117721 (A3V, log Lx = 30.4). These stars were strongly detected by HEAO-B (Golub et al. 1983) and, unlike many of the other A stars detected by Einstein, these objects appear to be single stars. lie thus propose to verify the presence of hot plasma in these stars by searching for the occurrence of transition region and chromospheric line emission. The detection of transition region line emission (i.e. C IV, N V, Si IV, etc.) in main sequence A stars would have important implications for (1) our understanding of the precise location on the main sequence of the onset of convection, and (2) the role of convection zone depth and surface turbulence in the generation of stellar chromospheric and coronal activity.

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