24 citations · 26 across the 5 of their papers we have counts for
5 papers
Newly discovered active binaries in the RasTyc sample of stellar X-ray sources
A. Frasca, P. Guillout, E. Marilli +2
We present preliminary results of follow-up optical observations, both photometric and spectroscopic, of stellar X-ray sources, selected from the cross-correlation of ROSAT All-Sky…
Spectroscopic Data Analysis for Precise Determination of Stellar Temperatures
K. Biazzo, A. Frasca, S. Catalano +1
The ratio of the depths of spectral lines is a powerful indicator of the effective temperature. The method based on this analysis is capable of discerning small temperature variati…
Photospheric temperature measurements in young main sequence stars
K. Biazzo, A. Frasca, G. W. Henry +2
As part of our program to study stellar photospheric and chromospheric activity, we have examined several young solar type stars with activity levels intermediate between the Sun a…
Photometric and spectroscopic follow-up of optical counterparts of X-ray sources in the RasTyc sample
Antonio Frasca, Patrick Guillout, Rubens Freire-Ferrero +2
The cross-correlation between the ROSAT all-sky survey (~150000 sources) and the Tycho mission (~1000000 stars) catalogs has selected about 14000 stellar X-ray sources (RasTyc samp…
Photospheric and chromospheric activity in four young solar-type stars
Katia Biazzo, Antonio Frasca, Gregory W. Henry +2
We present a photometric and spectroscopic study of four G-K dwarfs, namely HD 166, epsilon Eri, chi1 Ori and kappa1 Cet. In three cases, we find a clear spatial association betwee…