Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..822m&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 702, p. 822-827
Astronomy and Astrophysics
Astronomy
23
Chromosphere, Extreme Ultraviolet Radiation, Rosat Mission, Sky Surveys (Astronomy), Stellar Luminosity, Absorption Spectra, G Stars, H Alpha Line, K Stars, M Stars, Spectral Signatures, X Ray Astronomy
Scientific paper
Optical spectroscopic observations have been made of ten G-, K-, and M-type stars which were detected as EUV sources by the ROSAT Wide Field Camera (WFC). The optical spectra reveal the signatures of enhanced chromospheric activity in nine of the ten stars. H alpha appears as a partially filled absorption line in seven of nine stars observed in that region and is strongly in emission in two, HD 160934 and Wolf 1225. The strongest line of the Ca II infrared triplet (8542 A) appears as a partially filled absorption line in five of the six stars observed in that region. Two stars with filled H alpha and Ca II 8542 A lines (BD+48 3686 and HD 171488) were also observed to have a strong Li absorption line at 6707 A, suggesting an age less than the age of the Pleiades (7 x 107 yr). Two stars were discovered to be double-lined spectroscopic binaries (BD+27 3245 and HD 144110). This work has also identified a previously unreported chromospherically active star with a very strong level of activity strong level of activity, HD 160934.
Bopp Bernard William
Mulliss Christopher L.
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