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Spectroscopic characterization of a sample of southern visual binaries
Aims.We present the spectroscopic characterization of 56 pairs of visualbinaries with similar components, based on high resolution spectraacquired with FEROS at ESO La Silla. Methods: .For all stars, wemeasured radial and rotational velocities and CaII H&K emission. Results: .Five previously unknown double lined spectroscopic binarieswere found. Six other pairs show velocity differences that are notcompatible with the orbital motion of the wide pair, indicating thepresence of further companion(s) in the system. The fraction of visualbinaries that contain additional spectroscopic components is27±10%, compatible with other literature estimates. The ages ofthe components of the pairs derived from chromospheric activitytypically show apparent differences of about 0.2 dex. A few pairs show arather large difference in activity level, but in most cases this isconsistent with the variability of chromospheric emission observed forthe Sun along its magnetic cycle.
| Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.
| Long period double stars.
Abstract image available at:http://adsabs.harvard.edu/abs/1974A&A....33...15B
| Double stars of equal components.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972A&A....18..341S&db_key=AST
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Member of following groups:
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Observation and Astrometry data
| Constellation: | Centaurus |
| Right ascension: | 12h59m33.93s |
| Declination: | -48°31'31.3" |
| Apparent magnitude: | 8.836 |
| Distance: | 76.982 parsecs |
| Proper motion RA: | 14.3 |
| Proper motion Dec: | -13.3 |
| B-T magnitude: | 9.344 |
| V-T magnitude: | 8.878 |
Catalogs and designations:
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