Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..883f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 3, p. 883-899
Astronomy and Astrophysics
Astrophysics
64
Binary Stars, Chromosphere, H Alpha Line, Late Stars, Stellar Luminosity, Stellar Rotation, Surface Properties, Charge Coupled Devices, Echelle Gratings, Signal To Noise Ratios, Spectrographs, Stellar Spectrophotometry, Telescopes
Scientific paper
H alpha spectrophotometry of 33, chromospherically active, close binaries (mostly RS CVn), obtained at the Catania Astrophysical Observatory, is reported. We define the H alpha emission component for each observed system as the difference between the observed spectrum and a synthetic 'composite' spectrum made up by the weighted sum of spectra of non active stars similar in spectral types to the components of the system. This procedure allows us to detect an emission component in the H alpha core, also for some systems which apparently present a normal H alpha absorption profile. We investigate the possible correlation between this net H alpha surface flux and luminosity as a function of (B-V) and the rotational period. In particular we find that the net H alpha surface flux correlates moderately well with the rotational period, in agreement with previous results. The trend of increasing activity with decreasing rotational period can be described either by a power law or an exponential law.
Catalano Santo
Frasca Antonio
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