Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..609m&link_type=abstract
Astronomy and Astrophysics 285, 609-620 (1994)
Astronomy and Astrophysics
Astrophysics
23
Stars: Activity, Stars: Binaries: Close, Stars: Chromospheres, Stars: Distances, Stars: Late-Type, Stars: Rotation
Scientific paper
We present measurements of the emission core width W_0_ and the wavelength separation of the K_1_ dips, W_1_, of the Ca II H and K emission lines observed on high-dispersion spectra of 28 chromospherically active binary systems (RS CVn and BY Dra stars) and 18 single active stars. We test the width-luminosity correlations (the Wilson-Bappu (WB) effect, and (W_1_, M_V_)) in these very active stars and analyse the influence of the activity level (I_K_3__) and the rotational broadening (Vsin i) in these correlations. We have found that for very active stars the emission widths, both W_0_ and W_1_, are larger than expected from previously accepted width-luminosity relations. The stars with strong emission intensities, I_K_3__, and large values of Vsin i seem to present larger values of W_0_ than resulted from WB relation, the effect of the rotational velocity being the most remarkable. On the contrary, W_1_ is strongly influenced by I_K_3__ but the effect of the rotational broadening is lesser. We also analyse the behaviour of the Ca II H and K line parameters in these very active stars in relation with less active stars and we found that the increase of W_1_ and I_K_1__ with I_K_3__ presents a flattening for the most active stars which is different for each value of W_0_. Finally we also find a Hɛ width-luminosity correlation in the stars of the sample in which this emission line is present.
Cornide Manuel
de Castro Elisa
Fernandez-Figueroa María José
Montes David
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