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Contribution to the study of composite spectra: XII. Spectroscopic orbits of eight southern stars
We present the results of a radial-velocity study of eight southern SB1spectroscopic binaries with composite spectra: HD 34318-9, HD 47579-80,HD 70442-3, HD 74946-7, HD 102171-2, HD 120901-2, HD 168701-2, and HD174191-2. The observations were made at Haute-Provence observatory withthe CORAVEL instrument between 1982 and 2006. From the radial-velocitymeasurements of the cool components, we derive the orbital elements ofthose spectroscopic binaries. Using all the available data, we obtain anestimation of the orbital inclination and the angular separation of thetwo components. Finally we discuss the rotation-revolution synchronismof the cool components.
| SB9: The ninth catalogue of spectroscopic binary orbits
The Ninth Catalogue of Spectroscopic Binary Orbits(http://sb9.astro.ulb.ac.be) continues the series of compilations ofspectroscopic orbits carried out over the past 35 years by Batten andcollaborators. As of 2004 May 1st, the new Catalogue holds orbits for2386 systems. Some essential differences between this catalogue and itspredecessors are outlined and three straightforward applications arepresented: (1) completeness assessment: period distribution of SB1s andSB2s; (2) shortest periods across the H-R diagram; (3)period-eccentricity relation.
| Spectral classifications in the near infrared of stars with composite spectra. II. Study of a sample of 180 stars
A sample of 180 supposedly composite-spectrum stars has been studied onthe basis of spectra obtained in the near infrared (8370-8780 Angstroms)at a dispersion of 33 Anstroms/mm. The objective was to study the coolercomponents of the systems. Of our sample, 120 are true compositespectra, 35 are hot spectra of types B, F and 25 are Am stars. We find astrong concentration of the cooler components of the composite spectraaround G8III. In view of the difficulty of classifying compositespectra, because of the super position of an early type dwarf and a latetype giant or supergiant spectrum, we have made several tests to controlthe classification based upon the infrared region. Since all tests gavepositive results, we conclude that our classifications can be consideredas being both reliable and homogeneous. Table \ref{tab1} is alsoavailable electronically at the CDS via anonymous ftp 130.79.128.5 orhttp://cdsweb.u-strasbg.fr/Abstracts.html} Based upon observationscarried out at Observatoire de Haute-Provence (CNRS).
| A survey of stars with composite spectra.
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Pozíciós és asztrometriai adatok
| Csillagkép: | Északi Vízikígyó |
| Rektaszcenzió: | 11h45m25.92s |
| Deklináció: | -28°22'19.3" |
| Vizuális fényesség: | 8.462 |
| Távolság: | 290.698 parszek |
| RA sajátmozgás: | -15 |
| Dec sajátmozgás: | 4.3 |
| B-T magnitude: | 9.161 |
| V-T magnitude: | 8.52 |
Katalógusok és elnevezések:
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