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53 papers · 1 filter
Compact mid-IR sources east of galactic center source IRS5
M. Perger, J. Moultaka, A. Eckart +3
There are four less prominent compact sources east of IRS5, the natures of which were unclear until now. We present near-infrared K-band long slit spectroscopy of the four sources…
The pulsation modes of the pre-white dwarf PG 1159-035
J. E. S. Costa, S. O. Kepler, D. E. Winget +74
PG 1159-035, a pre-white dwarf with T_eff=140,000 K, is the prototype of both two classes: the PG1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-0…
Probing the submillimetre number counts at f(850um) < 2mJy
K. K. Knudsen, P. P. van der Werf, J. -P. Kneib
We have conducted a submillimetre mapping survey of faint, gravitationally lensed sources, where we have targeted twelve galaxy clusters and additionally the NTT Deep Field. The to…
Characterisation of the magnetic field of the Herbig Be star HD 200775
E. Alecian, C. Catala, G. A. Wade +9
After our recent discovery of four magnetic Herbig stars, we have decided to study in detail one of them, HD 200775, to determine if its magnetic topology is similar to that of the…
Freeware solutions for spectropolarimetric data reduction
F. Paletou, R. Rezaei, L. Leger
Most of the solar physicists use very expensive software for data reduction and visualization. We present hereafter a reliable freeware solution based on the Python language. This…
Magnetism in pre-MS intermediate-mass stars and the fossil field hypothesis
E. Alecian, G. A. Wade, C. Catala +11
Today, one of the greatest challenges concerning the Ap/Bp stars is to understand the origin of their slow rotation and their magnetic fields. The favoured hypothesis for the latte…