5 papers
Instabilities and pulsations in models of the B-type supergiant Cassiopeiae (HD 2905)
Abhay Pratap Yadav, Santosh Joshi, Wolfgang Glatzel
For the B-type supergiant Cassiopeiae (HD 2905) variabilities with periods between several hours and a few days have been observed both photometrically and spectroscopically. A…
Study of pulsational instabilities in models of Scuti pulsators discovered under the Nainital-Cape Survey
Abhay Pratap Yadav
Under the Nainital-Cape Survey, eight Scuti type pulsators have been discovered with the pulsation periods in the range of several minutes to few hours. In order to understand…
Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles
S. Boro Saikia, C. J. Marvin, S. V. Jeffers +6
Chromospheric activity monitoring of a wide range of cool stars can provide valuable information on stellar magnetic activity and its dependence on fundamental stellar parameters s…
Instability, finite amplitude pulsation and mass-loss in models of massive OB-type stars
Abhay Pratap Yadav, Wolfgang Glatzel
Variability and mass-loss are common phenomena in massive OB-type stars. It is argued that they are caused by violent strange mode instabilities identified in corresponding stellar…
Strange mode instabilities and mass-loss in evolved massive primordial stars
Abhay Pratap Yadav, Stefan Henrique Kühnrich Biavatti, Wolfgang Glatzel
A linear stability analysis of models for evolved primordial stars with masses between 150 and 250 M is presented. Strange mode instabilities with growth rates in the dyn…