RT Journal Article
T1 Application of the spectral subtraction technique to the Ca II H & K and H_ε lines in a sample of chromospherically active binaries
A1 Montes Gutiérrez, David
A1 Castro Rubio, Elisa De
A1 Fernández Figueroa, María José
A1 Cornide Castro-Piñeiro, Manuel
AB We present new spectroscopic observations in the Ca II H & K line region for a sample of 28 chromospherically active binary systems (RS CVn and BY Dra classes), with different activity levels. By using the spectral subtraction technique (subtraction of a synthesized stellar spectrum constructed from reference stars of similar spectral type and luminosity class) we obtain the active-chromosphere contribution to the Ca II H & K lines and to the H_ε line when it is present. We have compared the emission equivalent widths obtained with this technique with those obtained by reconstruction of the absorption line profile below the emission peak(s). The emissions arising from each individual star were obtained when it was possible to deblend the contribution of both components. The Ca II line profiles corresponding to different seasons and orbital phases are analysed in order to determine the contribution of each component and to study the chromospheric activity variations.
PB EDP Sciences
SN 0365-0138
YR 1995
FD 1995-12
LK https://hdl.handle.net/20.500.14352/59662
UL https://hdl.handle.net/20.500.14352/59662
LA eng
NO © 1995 EDP Sciences.This work has been supported by the Universidad Complutense de Madrid and the Spanish Dirección General de Investigación Científica y Técnica (DGICYT) under grant PB91-0348. We would like to thank the referee K.G. Strassmeier for suggesting several improvements and clarifications.
NO Universidad Complutense de Madrid (UCM)
NO Dirección General de Investigación Científica y Técnica (DGICYT), España
NO Ministerio de Economía y Competitividad (MINECO), España
DS Docta Complutense
RD 10 abr 2025