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Photometry and spectroscopy of the central star of the Trifid nebula
UBV photometry of the central star of the Trid nebula - HD 164492, which has so far been sus- pected of photometric as well as of radial velocity vari- ability - is presented. The results of ourExpand
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Physical elements of the eclipsing binary δ Orionis
For years, δ Orionis was considered a normal binary with an 09.5 II primary exhibiting apsidal-line advance. However, radial-velocity curves of both binary components have been derived from the IUEExpand
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Large distance of ε Aurigae inferred from interstellar absorption and reddening
The long-period (P = 27.1 years) peculiar eclipsing binary e Aur, which has recently completed its two year-long primary eclipse, has perplexed astronomers for over a century. The eclipse arises fromExpand
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HD 165246: an early-type binary with a low mass ratio
Analyses of 13 FEROS spectra from the ESO archive and 617 V-band photometric observations from the ASAS3 database allowed us to demonstrate that HD 165246 is a double-lined spectroscopic binary. AsExpand
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Refinement of third body parameters and new photometric results for the early-type multiple system IU Aurigae
The massive eclipsing binary system IU Aurigae is re-analyzed in the context of new photometric observations and an improved treatment of its long-term period changes (O–C diagram) derived from newExpand
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Tomographic Separation of Composite Spectra. X. The Massive Close Binary HD 101131
We present the first orbital elements for the massive close binary HD 101131, one of the brightest objects in the young open cluster IC 2944. This system is a double-lined spectroscopic binary in anExpand
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The early-type multiple system QZ Carinae
We present an analysis of the early-type quadruple system QZ Car, consisting of an eclipsing and a non-eclipsing binary. The spectroscopic investigation is based on new high dispersion echelle andExpand
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Spectroscopic and Photometric Analysis of the O-Type Binary V1182 Aquilae: A Close Eclipsing System with a Luminous Third Body*
We obtained high-resolution spectroscopy and UBV photometry of the O-type eclipsing binary V1182 Aql. In the spectra lines of a third component were found; the presence of third light is alsoExpand
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V379 Cephei: a quadruple system of two binaries
Context. Several binaries with masses anomalously small for their observed spectral types have been discussed in the astronomical literature and interpreted as the result of envelope ejection. V379Expand
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Physical properties of seven binary and higher-order multiple OB systems
Analyses of multi-epoch, high-resolution (~ 50000) optical spectra of seven early-type systems provided various important new insights with respect to their multiplicity. First determinations ofExpand
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