Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..458f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 2, March 1991, p. 458-462.
Astronomy and Astrophysics
Astrophysics
3
Chromosphere, Stellar Activity, Stellar Atmospheres, Variable Stars, Emission Spectra, Far Ultraviolet Radiation, Magnesium, Stellar Oscillations, Stellar Spectrophotometry
Scientific paper
High-resolution IUE spectra of the suspected variable Tau Cyg were obtained to search for a possible variability of the Mg II h, k double-peaked emission. The observations, spanning an interval of about 6.3 h, have shown flux excursions within or just near 15 percent, a value suggested as the detection limit of actual variations with IUE spectra. A variability, difficult to explain, could be present in the ratios Fk2v/Fk2r. The emission fluxes seem to be higher than those of the Delta Scuti variables Rho Pup and Beta Cas. This comparison could give some insights on the possible role of the convection on the pulsational and chromospheric activities of Tau Cyg. A positive correlation between the total emission fluxes and the rotational velocities of these stars was found.
Fracassini Massimo
Mariani Alberto
Pasinetti Fracassini Laura E.
Pastori Livio
Teays Terry J.
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