A spectrophotometric study of the peculiar open cluster Berkeley 87 is presented; the measurements show that most of the members are young, heavily reddened OB...
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PublicationA spectrophotometric study of the peculiar young open cluster Berkeley 87
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PublicationAn automatic procedure for a determination of the effective temperature and gravity - Application to 100 O-type stars
We have developed an automatic procedure to determine Teff and log g from the comparison of observational data with their theoretical values. After a...
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PublicationAnalysis of UV spectrophotometric observations for O-type stars
Spectral indices (delta m2100 and delta m1500) for 32 O-type stars with known spectral class and reddening are plotted versus log of effective temperature. The...
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PublicationImproved non-LTE Balmer-line profiles for hot stars
Improved non-LTE line formation calculations for hydrogen in O-stars are presented. The calculations are carried out by means of the method recently developed...
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PublicationIntrinsic parameters of galactic luminous OB stars
We present the results of a spectroscopic analysis of 25 galactic luminous OB stars. The gravities are in general lower than previously assumed, especially for...
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PublicationMulti-level non-LTE calculations for very optically thick winds and photospheres under extreme NLTE conditions
A new technique to calculate multilevel non-LTE continuum formation in the UV of stellar winds and plane-parallel, static stellar atmospheres is developed using...
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PublicationNLTE analysis of massive OB stars in open clusters
The paper presents a new method for deriving stellar masses and distances using the theory of radiatively driven winds as presented by Kudritzki et al. (1989)...
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PublicationObservations of massive OB stars
Preliminary results are presented of spectroscopic analysis of ten young stars in OB associations using high resolution spectra and NLTE calculations. From the...
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PublicationOn the massive star-forming capacity of molecular clouds
Assuming that photoionization is the self-limiting process for continued star formation, we estimate the maximum number of massive (OB) stars that can form...