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6 papers · 2 filters
Magnetic fields in early-type stars
Jason H. Grunhut, Coralie Neiner
For several decades we have been cognizant of the presence of magnetic fields in early-type stars, but our understanding of their magnetic properties has recently (over the last de…
Four new HgMn stars: HD 18104, HD 30085, HD 32867, HD 53588
R. Monier, M. Gebran, F. Royer
We have detected four new HgMn stars, while monitoring a sample of apparently slowly rotating superficially normal bright late B and early A stars in the northern hemisphere. Impor…
On the Statistical Relationship between CME Speed and Soft X-ray Flux and Fluence of the Associated Flare
Carolina Salas-Matamoros, Karl-Ludwig Klein
Both observation and theory reveal a close relationship between the kinematics of coronal mass ejections (CMEs) and the thermal energy release traced by the related soft X-ray (SXR…
CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS
F. J. Alonso-Floriano, J. C. Morales, J. A. Caballero +9
Context. CARMENES is a stabilised, high-resolution, double-channel spectrograph at the 3.5 m Calar Alto telescope. It is optimally designed for radial-velocity surveys of M dwarfs…
Oxygen enrichment in carbon-rich planetary nebulae
Gloria Delgado-Inglada, Mónica Rodríguez, Manuel Peimbert +2
We study the relation between the chemical composition and the type of dust present in a group of 20 Galactic planetary nebulae (PNe) that have high quality optical and infrared sp…
Discovery of a Shell of Neutral Atomic Hydrogen Surrounding the Carbon Star IRC+10216
L. D. Matthews, E. Gerard, T. Le Bertre
We have used the Robert C. Byrd Green Bank Telescope to perform the most sensitive search to date for neutral atomic hydrogen (HI) in the circumstellar envelope (CSE) of the carbon…