Bibcode
DOI
Arévalo, M. J.; Lázaro, C.
Referencia bibliográfica
The Astronomical Journal, Volume 118, Issue 2, pp. 1015-1033.
Fecha de publicación:
8
1999
Número de citas
26
Número de citas referidas
26
Descripción
We present the second part of the results of our spectroscopic study of
orbital phase resolution of short-period active binaries. In this paper
we present the observations of the binaries RT And, WY Cnc, and XY UMa,
for which we obtained simultaneous low-resolution spectra in the
Hα, Hβ, and Ca II infrared triplet (IRT; 8498 and 8542
Å) lines, and higher resolution spectra in Hα for WY Cnc and
XY UMa. Hα and Hβ emission excess was found in all the
observed orbital phases of WY Cnc and XY UMa, while RT And showed
Hα emission only during some orbital phases. We measure a clear Ca
II (IRT) excess in all the spectra of the three binaries. The ratio of
the flux excesses derived for these binaries, E_Hα/E_Hβ~= 1-3
and E_8542/E_8498~= 1-3, give low values typical of solar plage
structures. In the higher resolution Hα spectra, we found
emissions that can be associated with both stellar components of XY UMa
and WY Cnc, indicating that the faint secondary stars in both binaries
are active late-type dwarfs. Some Hα emission components, which
could originate in extended structures between the stars, were detected
in both systems.