Volume 402, Number 3, May II 2003
First Science with the ODIN satellite
|Page(s)||1043 - 1053|
|Section||Stellar structure and evolution|
|Published online||23 April 2003|
Institute of Theoretical Astrophysics, PO Box 1029, Blindern, 0315 Oslo, Norway
Corresponding author: V. Aarum Ulvås, email@example.com
Accepted: 7 January 2003
This paper presents a technique for separation of individual components in composite stellar spectra. The technique is based on a comparison of residual depths of the component spectral lines to residual depths of the corresponding spectral lines of a single star of the same spectral class. We apply the technique to high resolution spectra of the RS CVn system UX Ari, where the spectral lines from all three components are well resolved. The deduced variations in the relative flux of the primary component agree well with simultaneously obtained photometric observations of UX Ari. The starspots causing the light curve variations and the facular areas causing the chromospheric emission seem to be separated by about in longitude on the surface of the primary component. We also find that the secondary component of UX Ari is subject to some chromospheric activity. Finally, some fundamental parameters of the third star in the spectrum are derived and discussed.
Key words: techniques: spectroscopic / stars: activity / binaries: spectroscopic / stars: imaging / stars: individual: UX Ari / starspots
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.