4 papers
The Araucaria Project: VLT-spectroscopy of blue massive stars in NGC 55
N. Castro, A. Herrero, M. Garcia +6
This is the first paper of a series devoted to studying the population of blue massive stars in NGC 55, a galaxy of the Sculptor group at a distance of about 2 Mpc. We have obtaine…
Clumping in the winds of O-type CSPNs
M. A. Urbaneja, R. -P. Kudritzki, J. Puls
Recent studies of massive O-type stars present clear evidences of inhomogeneous and clumped winds. O-type (H-rich) central stars of planetary nebulae (CSPNs) are in some ways the l…
The hot subdwarf B + white dwarf binary KPD 1930+2752 - a Supernova Type Ia progenitor candidate
S. Geier, S. Nesslinger, U. Heber +3
The nature of the progenitors of type Ia supernovae is still under controversial debate. KPD 1930+2752 is one of the best SN Ia progenitor candidates known today. The object is a d…
The Araucaria Project. An Accurate Distance to the Local Group Galaxy NGC 6822 from Near-Infrared Photometry of Cepheid Variables
W. Gieren, G. Pietrzynski, K. Nalewajko +5
We have measured near-infrared magnitudes in the J and K bands for 56 Cepheid variables in the Local Group galaxy NGC 6822 with well-determined periods and optical light curves in…