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297 papers · 1 filter
The Observatorio del Teide welcomes SONG: The Stellar Observations Network Group
O. L. Creevey, F. Grundahl, P. L. Pallé +6
The Stellar Observations Network Group (SONG) is an international network project aiming to place eight 1-m robotic telescopes around the globe, with the primary objectives of stud…
A remark on proper partitions of unity
Jose M. Garcia Calcines
In this paper we introduce, by means of the category of exterior spaces and using a process that generalizes the Alexandroff compactification, an analogue notion of numerable cover…
Dissecting early-type dwarf galaxies into their multiple components
J. Janz, E. Laurikainen, T. Lisker +8
Early-type dwarf galaxies, once believed to be simple systems, have recently been shown to exhibit an intriguing diversity in structure and stellar content. To analyze this further…
The Ly-alpha Lines of H I and He II: A Differential Hanle Effect for Exploring the Magnetism of the Solar Transition Region
Javier Trujillo Bueno, Jiri Stepan, Luca Belluzzi
The Ly-alpha line of He II at 304 Å is one of the spectral lines of choice for EUV channels of narrow-band imagers on board space telescopes, which provide spectacular intensity im…
Two Remarkable Spectroscopic Categories of Young O Stars from the VLT-FLAMES Tarantula Survey
Nolan R. Walborn, Hugues Sana, William D. Taylor +2
The spectral and spatial characteristics of two special categories of O stars found in the VFTS dataset are presented. One of them comprises very rapid rotators, including several…
On the non-evolution of the dependence of black hole masses on bolometric luminosities for QSOs
M. Lopez-Corredoira, C. M. Gutierrez
There are extremely luminous quasi stellar objects (QSOs) at high redshift which are absent at low redshift. The lower luminosities at low redshifts can be understood as the extern…