Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..347p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 347-359.
Astronomy and Astrophysics
Astrophysics
23
Calcium, Dwarf Stars, G Stars, K Lines, Stellar Spectra, Star Formation Rate, Stellar Activity, Stellar Atmospheres, Stellar Evolution, Stellar Spectrophotometry
Scientific paper
High resolution, high S/N ratio Ca II data are presented for an unbiased sample of stars that have overall characteristics similar to the sun. The observed behavior of Ca II K line features over the solar cycle is compared with similar quantities observed in solar-type stars. It is shown that all trends observed for the sun are true for the observed stars, and the claim that the solar paradigm can be extended to other G dwarfs is confirmed. Accurate Wilson Bappu (W-B) widths were measured for sample stars; the G stars as a group were found to be consistent with the W-B relationships proposed by Lutz (1970). Within the measurement errors, no dependence of the W-B width on activity was found. A comparison with solar plages shows significant similarity between solar plage spectra and active star spectra. It is suggested that activity in solar-type stars is most likely due to the presence of plages similar to those observed on the sun.
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