7 papers
Searching for White and Brown Dwarfs in the frame of the MUSYC/CYDER survey
M. Altmann, R. A. M'endez, M. -T. Ruiz +4
MUSYC (MUltiwavelength Survey by Yale and Chile), and its predecessor, the CYDER (Cal'an Yale Deep Extragalactic Research) survey are both deep multiwavelength surveys mainly aimin…
3D-Kinematics of White Dwarfs from the SPY-Project
E-M. Pauli, U. Heber, R. Napiwotzki +2
We present kinematics of a sample of 398 DA white dwarfs from the SPY project (ESO SN Ia Progenitor surveY) and discuss kinematic criteria for a distinction of thin disk, thick dis…
The stars near the centre of supergiant shell LMC4: Further constraints on triggering scenarios
Jochen M. Braun, Klaas S. de Boer, Martin Altmann
The huge supergiant shell (SGS) LMC4, next to the giant HII region 30 Doradus the second most impressive feature of the Large Magellanic Cloud (LMC), has been the subject of many s…
Photometric and kinematic studies of open star clusters. II. NGC 1960 (M 36) and NGC 2194
Joerg Sanner, Martin Altmann, Jens Brunzendorf +1
We present CCD photometry and proper motion studies of the two open star clusters NGC 1960 (M 36) and NGC 2194. Fitting isochrones to the colour magnitude diagrams, for NGC 1960 we…
Long-term photometry of the Wolf-Rayet stars WR 137, WR 140, WR 148, and WR 153
Kyril P. Panov, Martin Altmann, Wilhelm Seggewiss
In 1991, a long term UBV-photometry campaign of four Wolf-Rayet stars was started using the 60 cm telescope of the National Astronomical Observatory Rozhen, Bulgaria. Here we repor…
Kinematical trends among the field horizontal branch stars
Martin Altmann, Klaas S. de Boer
Field Horizontal branch (HB) stars can be used as tracers for the study of early stages of the evolution of our galaxy. Since the age of individual HB stars is not known a priori,…