11 papers
Stellar Associations and their Field East of LMC 4 in the Large Magellanic Cloud
D. Gouliermis, K. S. de Boer, S. C. Keller +2
We report about the stellar content and the luminosity and mass functions of three stellar associations and their field located on the north-east edge of the super-bubble LMC 4 in…
Absorption line systems on the line of sight from SN 1987A to SN 1993J and the intergalactic cloud in front of M81
Ole Marggraf, Klaas S. de Boer
We present an extended analysis of the high dispersion IUE spectra of SN 1993J in M81, based on the improved data in the IUE final archive. Eight interstellar absorption components…
ORFEUS II Echelle spectra: Molecular hydrogen at high velocities toward HD 93521
W. Gringel, J. Barnstedt, K. S. de Boer +3
Absorption lines of interstellar molecular hydrogen in the far ultraviolet (FUV) have been observed in the spectrum of the O9.5 halo star HD 93521, located some 1500 pc from the Ga…
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…
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,…
ORFEUS II echelle spectra: On the H_2/CO ratio in the LMC towards LH 10
P. Richter, K. S. de Boer, D. J. Bomans +3
ORFEUS far UV echelle spectra have been used to investigate HI, H_2 and CO absorption lines along the line of sight towards LH 10:3120 in the LMC, extending the study presented by…