Multiple stars across the H-R diagram : proceedings of the by S Hubrig; M Petr-Gotzens; A A Tokovinin; European Southern

By S Hubrig; M Petr-Gotzens; A A Tokovinin; European Southern Observatory

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Secondly, in the framework of a systematic study of line-profile variable early-type B stars in close binary systems with the aim to study tidal effects on the pulsational behavior, timeseries of high-resolution spectra where obtained during consecutive nights in 54 K. Uytterhoeven et al. Fig. 1. A randomly chosen set of data for 68 u Her obtained with the SOFIN spectrograph at the NOT telescope. 929 ˚ A profiles (right). The spectra are offset for clarity 1996 and 2003. Table 1 gives a logbook of the observations.

V. Ya. Zhuchkov: Astron. Rep. 49, 201 (2005) This page intentionally blank Multiple Stars: Designation, Catalogues, Statistics A. edu Summary. Discussion of the designation of multiple-star components leads to a conclusion that, apart from components, we need to designate systems and centersof-mass. The hierarchy is coded then by simple links to parent. This system is adopted in the multiple star catalogue, now available on-line. A short review of multiple-star statistics is given: the frequency of different multiplicities in the field, periods of spectroscopic sub-systems, relative orbit orientation, empirical stability criterion, and period-period diagram with its possible connection to formation of multiple stars.

Ru Summary. We review physical and dynamical parameters of multiple stars. Possible scenaria of multiple star formation are discussed: their birth in dense cloud cores and the decay of small stellar groups and clusters. We compare physical and dynamical features of simulated multiple stars formed by these processes with the actual multiple stars. Multiplicity function, their period, eccentricity and mass ratio distributions, hierarchy of the structures are analysed. Also we discuss multiple systems where the apparent ages of the components are different.

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Multiple stars across the H-R diagram : proceedings of the by S Hubrig; M Petr-Gotzens; A A Tokovinin; European Southern
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