2026-06-28T04:47:54Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/597002024-09-05T15:30:01Zcom_20.500.14352_14col_20.500.14352_15

The Wilson-Bappu effect and other CA-II H-Line and K-line parameters relationships in chromospherically active binaries Montes Gutiérrez, David Fernández Figueroa, María José Castro Rubio, Elisa De Cornide Castro-Piñeiro, Manuel 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_K3) 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_K3 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_K3 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_K1 With I_K3 presents a flattening for the most active stars which is different for each value of W_0. Finally we also find a Hepsilon width-luminosity correlation in the stars of the sample in which this emission line is present. 2023-06-20T20:09:21Z 2023-06-20T20:09:21Z 2023-06-20T20:09:21Z 1994-05 journal article https://hdl.handle.net/20.500.14352/59700 0004-6361 eng PB91-0348 open access EDP Sciencies