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13 papers · 2 filters
The Magnetic Fields at the Surface of Active Single G-K Giants
M. Aurière, R. Konstantinova-Antova, C. Charbonnel +15
We investigate the magnetic field at the surface of 48 red giants selected as promising for detection of Stokes V Zeeman signatures in their spectral lines. We use the spectropolar…
How accurate are stellar ages based on stellar models? II. The impact of asteroseismology
Yveline Lebreton, Marie-Jo Goupil, J. Montalban
Accurate and precise stellar ages are best determined for stars which are strongly observationally constrained, that is which are intrinsically oscillating. We review here the seis…
How accurate are stellar ages based on stellar models ? I. The impact of stellar models uncertainties
Yveline Lebreton, Marie-Jo Goupil, J. Montalban
Among the various methods used to age-date stars, methods based on stellar model predictions are widely used, for nearly all kind of stars in large ranges of masses, chemical compo…
The BRITE spectropolarimetric survey
C. Neiner, A. Lèbre
The BRITE constellation of nanosatellites observes very bright stars to perform seismology. We have set up a spectropolarimetric survey of all BRITE targets, i.e. all ~600 stars br…
Spectroscopy of Hyades L dwarf candidates
N. Lodieu, S. Boudreault, V. J. S. Bejar
We present the results of photometric, astrometric, and spectroscopic follow-up of L dwarf candidates identified in the Hyades cluster by Hogan et al. (2008). We obtained low-resol…
On the central symmetry of the circumstellar envelope of RS Cnc
Pham Tuyet Nhung, Do Thi Hoai, Jan Martin Winters +3
We present a phenomenological study of CO(1-0) and CO(2-1) emission from the circumstellar envelope (CSE) of the Asymptotic Giant Branch (AGB) star RS\,Cnc. It reveals departures f…