Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107..292r&link_type=abstract
Astronomy and Astrophysics, vol. 107, no. 2, Mar. 1982, p. 292-299.
Astronomy and Astrophysics
Astrophysics
56
Absorption Spectra, Red Giant Stars, Stellar Atmospheres, Stellar Coronas, Stellar Envelopes, Stellar Winds, Calcium, Hertzsprung-Russell Diagram, Iue, Line Spectra, Magnesium, Stellar Mass Ejection, Stellar Spectra
Scientific paper
In addition to the three known hybrid atmosphere stars (Alpha and Beta Aqr, and Alpha TrA), the three red giants (Theta Her, Iota Aur and Delta TrA) which have both transition layer lines (N V, C IV, Si IV, C II) and cool winds have been detected. It is shown that all six known hybrid stars have double circumstellar Ca II and Mg II absorption lines, one high-velocity component at -70 to -140 km/sec and one low-velocity component at -5 to -20 km/sec. Together with six further stars with double circumstellar lines, these stars occupy the dividing region in the HR-diagram which separates stars with transition layer lines from stars with circumstellar lines.
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