Late-type Stars with Coronae but No Chromospheres?

Details Late-type Stars with Coronae but No Chromospheres? Late-type Stars with Coronae but No Chromospheres?

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.1206c&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #12.06; Bulletin of the American Astronomical Society, Vol. 34, p.1113

Astronomy and Astrophysics

Astronomy

Scientific paper

We present high resolution optical observations of several late-type stars selected from ROSAT and EUVE surveys. These particular stars show no Balmer or Ca II emission typical of late-type stars with X-ray evidence for coronae. Since our sample shows no evidence for binarity in their optical spectra, these stars may have no chromospheres. We present preliminary results from simulated spectra using the MULTI code of Carlsson for solving multi-level non-LTE radiative transfer problems in plane parallel atmospheres. These simulations can reproduce the observed Ca II line profiles. Stars without chromospheres are expected to have high density coronae and transition regions, which we will investigate with future FUV and X-ray observations.

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