X iv : a st ro - p h / 04 02 20 7 v 1 9 F eb 2 00 4 The Effective Temperatures of Hot Stars II . The Early - O Types

X iv : a st ro - p h / 04 02 20 7 v 1 9 Fe b 20 04 The Effective Temperatures of Hot Stars II . The Early - O Types . 1

We derived the stellar parameters of a sample of Galactic early-O type stars by analysing their UV and Far-UV spectra from FUSE (905-1187Å), IUE, HSTSTIS and ORFEUS (1200-2000Å). The data have been modeled with spherical, hydrodynamic, line-blanketed, non-LTE synthetic spectra computed with the WM-basic code. We obtain effective temperatures ranging from Teff= 41,000 K to 39,000 K for the O3-O4...

ar X iv : a st ro - p h / 04 02 16 8 v 1 7 F eb 2 00 4 A search for wide ( sub ) stellar companions around extrasolar planet host stars

We present an overview of our ongoing systematic search for wide (sub)stellar companions around the stars known to host rad-vel planets. By using a relatively large field of view and going very deep, our survey can find all directly detectable stellar and massive brown dwarf companions (m>40 MJup) within a 1000 AU orbit.

ar X iv : a st ro - p h / 99 02 06 2 v 1 4 F eb 1 99 9 SOURCES OF RELATIVISTIC JETS IN THE GALAXY

ar X iv : a st ro - p h / 06 02 20 5 v 1 9 F eb 2 00 6 Disentangling effective temperatures of individual eclipsing binary components by means of color - index constraining

Eclipsing binary stars are gratifying objects because of their unique geometrical properties upon which all important physical parameters such as masses, radii, temperatures, luminosities and distance may be obtained in absolute scale. This poses strict demand on the model to be free of systematic effects that would influence the results later used for calibrations, catalogs and evolution theor...

ar X iv : a st ro - p h / 05 02 51 7 v 1 24 F eb 2 00 5 The baryonic mass function of galaxies

In the Big Bang about 3% of the mass that was created was in the form of normal baryonic matter (neutrons and protons). Of this about 10% ended up in galaxies in the form of stars or of gas (that can be in molecules, can be atomic, or can be ionised). In this work, we measure the baryonic mass function of galaxies, which describes how the baryonic mass is distributed within galaxies of differen...