Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5164m&link_type=abstract
HST Proposal ID #5164
Astronomy and Astrophysics
Astrophysics
Hst Proposal Id #5164 Stellar Astrophysics Cool Stars
Scientific paper
This is the first survey of coronal lines in the ultraviolet spectra of late-type stars. The the target was chosen on the basis of large apparent X-ray fluxes and large ratio of hot-to-cool component in X-ray fluxes. The objectives are to detect and measure coronal lines, together with transition region and chromospheric lines that can be observed at the same HRS grating setting, to investigate the temperature, density distribution in the outer atmospheres of late-type stars, and to look for possible activity in the coronal lines, since even targets that are not recognized flare stars on the basis of present data on chromospheric and photospheric activity may produce detectable flares when observed in coronal lines. For maximum signal-to-noise in the coronal lines, assuming the corona is quiet, all of the observing time allocated per star is used at a single grating setting. However, brief exposures are made in repeat observation mode so that if the lines are bright, presumably due to flaring, variability information will be preserved. The results will be analyzed together with available X-ray data and other relevant observations from other facilities.
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