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A peculiar object in M51: fuzzy star cluster or a background galaxy?
R. A. Scheepmaker, H. J. G. L. M. Lamers, S. S. Larsen +1
Aims: We study a peculiar object with a projected position close to the nucleus of M51. It is unusually large for a star cluster in M51 and we therefore investigate the three most…
Mass Loss and Evolution of Stars and Star Clusters: a Personal Historical Perspective
Henny J. G. L. M. Lamers
The development and progress of the studies of winds and mass loss from hot stars, from about 1965 up to now, is discussed in a personal historical perspective. The present state o…
Star clusters in the solar neighborhood: a solution to Oort's problem
H. J. G. L. M. Lamers, M. Gieles
In 1958 Jan Oort remarked that the lack of old clusters in the solar neighborhood (SN) implies that clusters are destroyed on a timescale of less than a Gyr. This is much shorter t…
The Analysis of the Rotating Disk of some Southern Galactic B[e] Stars
Marcelo Borges Fernandes, H. J. G. L. M. Lamers, Michaela Kraus
The spectra of stars with the B[e] phenomenon are dominated by features that are related to physical conditions of circumstellar material around these objects and are not intrinsic…
The Evolutionary Stage of 5 Southern Galactic Unclassified B[e] Stars
Marcelo Borges Fernandes, Francisco X. de Araújo, H. J. G. L. M. Lamers
The spectra of stars with the B[e] phenomenon are dominated by features that are related to physical conditions of circumstellar material around these objects and are not intrinsic…
The radiation driven winds of rotating B[e] supergiants
Inti Pelupessy, Henny J. G. L. M. Lamers, Jorick S. Vink
We have formulated the momentum equation for sectorial line driven winds from rotating stars including: (a) the oblateness of the star, (b) gravity darkening (von Zeipel effect), (…