26 citations · 48 across the 6 of their papers we have counts for
3 papers · 1 filter
A Long-Term Spectral Study of the Single Active Giant OP Andromedae
Stefan Georgiev, Renada Konstantinova-Antova, Ana Borisova +10
We present a spectral study of the single magnetically active K giant OP And in the period 1979 -- 2018, monitoring the variability of the activity indicator line H. Original da…
The different origins of magnetic fields and activity in the Hertzsprung gap stars, OU Andromedae and 31 Comae
A. Borisova, M. Aurière, P. Petit +3
Context: When crossing the Hertzsprung gap, intermediate-mass stars develop a convective envelope. Fast rotators on the main sequence, or Ap star descendants, are expected to becom…
Bayesian approach to cyclic activity of CF Oct
Ana P. Borisova, Valeri V. Hambaryan, John L. Innis
Bayesian statistical methods of Gregory-Loredo and the Bretthorst generalization of the Lomb-Scargle periodogram have been applied for studying activity cycles of the early K-type…