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13 papers · 1 filter
Photospheric and chromospheric activity in V405 And: An M dwarf binary with components on the two sides of the full convection limit
K. Vida, K. Oláh, Zs. Kővári +4
We investigate the fast-rotating (P_orb=P_rot=0.465d), active dwarf binary V405 And (M0V+M5V) using photometric BV(RI)_C and optical spectroscopic data. The light variation is caus…
Imaging and Modeling Rapidly Rotating Stars: Alpha Cephei and Alpha Ophiuchi
M. Zhao, J. D. Monnier, E. Pedretti +10
We present sub-milliarcseond resolution imaging and modeling of two nearby rapid rotators Alpha Cephei and Alpha Ophiuchi, obtained with the CHARA array - the largest optical/IR in…
The secrets of T Pyxidis II. A recurrent nova that will not become a SN Ia
P. Selvelli, A. Cassatella, R. Gilmozzi +1
By various methods, we obtained L 70 L and 1.1 10 Myr. These values were about twice as high in the pre-1…
Tracing the young massive high-eccentricity binary system Theta 1 Orionis C through periastron passage
S. Kraus, G. Weigelt, Y. Y. Balega +10
The nearby high-mass star binary system Theta 1 Orionis C is the brightest and most massive of the Trapezium OB stars at the core of the Orion Nebula Cluster, and it represents a p…
Stratification and Isotope Separation in CP Stars
C. R. Cowley, S. Hubrig, F. G. Gonzalez
We investigate the elemental and isotopic stratification in the atmospheres of selected chemically peculiar (CP) stars of the upper main sequence. Reconfiguration of the UVES spect…
Pre-maximum spectro-imaging of the Mira star T Lep with AMBER/VLTI
Jean-Baptiste Le Bouquin, Sylvestre Lacour, Stephanie Renard +3
Diffuse envelopes around Mira variables are among the most important sources influencing the chemical evolution of galaxies. However they represent an observational challenge becau…