367 citations · 8.3k across the 236 of their papers we have counts for
11 papers · 1 filter
The MiMeS Project: First Results
J. H. Grunhut, E. Alecian, D. A. Bohlender +11
Massive stars are those stars with initial masses above about 8 times that of the sun, eventually leading to catastrophic explosions in the form of supernovae. These represent the…
Discovery of very low amplitude 9-minute multiperiodic pulsations in the magnetic Ap star HD 75445
O. Kochukhov, S. Bagnulo, G. Lo Curto +1
We present our discovery of pulsational radial-velocity variations in the cool Ap star HD 75445, an object spectroscopically similar to the bright, rapidly-oscillating Ap (roAp) st…
New high resolution synthetic stellar libraries for the Gaia Mission
R. Sordo, A. Vallenari, J. C. Bouret +12
High resolution synthetic stellar libraries are of fundamental importance for the preparation of the Gaia Mission. We present new sets of spectral stellar libraries covering two sp…
MOST discovers a multimode delta Scuti star in a triple system: HD 61199
M. Hareter, O. Kochukhov, H. Lehmann +13
A field star, HD 61199 (V ~ 8), simultaneously observed with Procyon by the MOST (Microvariability & Oscillations of STars) satellite in continuous runs of 34, 17, and 34 days in 2…
Pulsation in the atmosphere of roAp stars
O. Kochukhov
High time resolution spectroscopy of roAp stars at large telescopes has led to a major breakthrough in our understanding of magnetoacoustic pulsations in these interesting objects.…
Magnetic fields and chemical peculiarities of the very young intermediate-mass binary system HD 72106
C. P. Folsom, G. A. Wade, O. Kochukhov +9
The recently discovered magnetic Herbig Ae and Be stars may provide qualitatively new information about the formation and evolution of magnetic Ap and Bp stars. We have performed a…
Pulsations in the atmosphere of the rapidly oscillating Ap star 10 Aquilae
M. Sachkov, O. Kochukhov, T. Ryabchikova +4
The rapidly oscillating Ap (roAp) star 10 Aql shows one of the lowest photometric pulsation amplitudes and is characterized by an unusual spectroscopic pulsational behavior compare…
Model atmospheres of magnetic chemically peculiar stars. A remarkable strong-field Bp SiCrFe star HD137509
Denis Shulyak, Oleg Kochukhov, Sergiy Khan
In the last few years we have developed stellar model atmospheres which included effects of anomalous abundances and strong magnetic field. The full treatment of anomalous Zeeman s…
The effect of rotation on the abundances of the chemical elements of the A-type stars in the Praesepe cluster
L. Fossati, S. Bagnulo, J. Landstreet +5
We study how chemical abundances of late B-, A- and early F-type stars evolve with time, and we search for correlations between the abundance of chemical elements and other stellar…
The Paschen-Back effect in the Li I 6708 A line and the presence of lithium in cool magnetic Ap stars
O. Kochukhov
A number of cool magnetic Ap stars show a prominent feature at lambda 6708 A. Its identification with Li I remains controversial due to a poor knowledge of the spectra of rare-eart…
Isotopic anomaly and stratification of Ca in magnetic Ap stars
T. Ryabchikova, O. Kochukhov, S. Bagnulo
We have carried out an accurate investigation of the Ca isotopic composition and stratification in the atmospheres of 23 magnetic chemically peculiar (Ap) stars of different temper…