2002A&A...386..286C -
Astronomy and Astrophysics, volume 386, 286-295 (2002/4-4)
Spectral line ratios as Teff indicators in solar-like stars.
CACCIN B., PENZA V. and GOMEZ M.T.
Abstract (from CDS):
The ratios of spectral line depths are often used as indicators of the stellar effective temperature T
eff. In particular, Gray & Livingston (
1997ApJ...474..798G) calibrated the temperature sensitivity of the ratios between the central depths of the line C I 538.032nm and either the Fe I 537.958 or the Ti II 538.103, making use of observed spectra of several solar-like stars. The ultimate reason for choosing these lines was the subsequent application of their calibration to a long series of solar data, collected at Kitt Peak (in disk-integrated light) from 1978 to 1992, in order to get the T
eff variation of the Sun during its 11-yr magnetic cycle (Gray & Livingston,
1997ApJ...474..802G). We propose a theoretical calibration that includes a careful treatment of convective transport and fits the stellar data very well, showing, at the same time, that the empirical calibration of Gray and Livingston incorporates in the T
eff sensitivity an undesired dependence of line ratios on the surface gravities of the individual stars they used. A possible dependence of the calibration upon stellar rotation is also explored.
Abstract Copyright:
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Journal keyword(s):
stars: late-type - stars: atmosphere - stars: fundamental parameters - Sun: activity - convection
Simbad objects:
5
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