Assuming that photoionization is the self-limiting process for continued star formation, we estimate the maximum number of massive (OB) stars that can form...
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PublicationOn the massive star-forming capacity of molecular clouds
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PublicationOn the post-T-Tauri nature of late-type visual companions to B-type stars
We report on intermediate-to-high resolution spectroscopy and standard broadband photometry of late-type visual companions to early-type stars. Our program...
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PublicationOn the presence of two discs in the X-ray/Be binary A 0535 + 26/HDE 245770
The analysis of the efficiency of accretion in the X-ray binary system A 0535 + 26/HDE 245770 and of the specific angular momentum of the matter accreted during...
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PublicationOn the shell spectrum of 48 Librae
Spectrograms of the variable star 48 Librae, taken near the last expected minimum, have been examined for irregularities of the shell line profiles. The...
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PublicationPhysical parameters of reflection nebulae in the galaxy
Given observed equivalent widths of Mg II and Mg I absorptions due to an interstellar cloud in which a late-B star is embedded, it is shown that the basic...
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PublicationStar formation in stellar systems
The present volume on stellar formation discusses basic physical principles relevant to such processes, regions of recent star formation, galaxy formation and...
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PublicationStromgren and infrared photometry of OB candidates in the association Cygnus OB2
The Cygnus OB2 association contains some of the most massive and most luminous O-stars in the northern hemisphere. As a first step toward studying the initial...
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PublicationThe visible spectra of three B stars - Pi Cet, 36 Lyn, and 134 Tau
An identification list is presented for the visible spectra of Pi Cet (B7 V), 36 Lyn (B8 IIIp), and 134 Tau (B9 IV). Equivalent widths are measured on medium...
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PublicationTime resolved spectroscopy of AM CVn
The preliminary results of time-resolved spectroscopy of the He White Dwarf system AM CVn are presented. Spectral variations at different photometric periods...