Bibcode
Rebolo, R.; Garcia Lopez, R.; Beckman, J. E.; Vladilo, G.; Foing, B. H.; Crivellari, L.
Bibliographical reference
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 80, no. 2, Oct. 1989, p. 135-148. Research supported by EEC.
Advertised on:
10
1989
Citations
14
Refereed citations
12
Description
As a result of a major program of spectral observations using the CAT
1.4 m telescope and Coude Echelle Spectrograph at ESO, La Silla, 68 high
resolution profiles of the 3968.5 A Ca H resonance line have been
obtained for 16 late type stars (dwarfs and subgiants, including the
sun) ranging from F9 to K5, selected to be representative of a wide span
of chromospheric activity. The methods, and results of a set of
reduction and analysis techniques applied to these spectra are
presented. Each wavelength scale is converted to a frame at rest with
respect to the photosphere of the star, and the flux scale is finally
transformed into units of absolute flux. A major effort was applied to
quantify the effects of the tilted baselines of the recorded spectra on
these absolute flux calibrations. The calibrated profiles are used to
extract and tabulate measured chromospheric H emission fluxes and the
velocity shifts with respect to the photosphere of the emission cores
and of the H3 self-reversals.