Contribution to the search for binaries among Am stars - VII. Orbital elements of seven new spectroscopic binaries, implications on tidal effects
We present the results of a radial-velocity study of seven Am stars (HD3970, 35035, 93946, 151746, 153286, 204751 and 224002) observed at theObservatoire de Haute-Provence (OHP) and the Cambridge Observatorieswith CORAVEL instruments. We find that these systems are single-linedspectroscopic binaries whose orbital elements are determined for thefirst time. Among this sample, HD 35035 and 153286 have long periods,with P = 2.8 and 9.5yr, respectively, which is rather unusual for Amstars. Four systems have orbits with large eccentricities (with e >=0.4). Physical parameters are inferred from this study for the primariesof those systems.We then investigate the influence of tidal interaction, which hasalready led to the synchronism of the primaries and/or to thecircularization of the orbits of some systems belonging to this sample.We extend this study to the list of 33 objects studied in this series ofpapers and derive values of the critical fractional radii r = R/a forcircularization and synchronization of Am-type binaries. We find thatthe stars with r >~ 0.15 are orbiting on circular orbits and thatsynchronism is likely for all components with r >~ 0.20.
|
UvbyHbeta_ photometry of main sequence A type stars.
We present Stroemgren uvby and Hbeta_ photometry for a set of575 northern main sequence A type stars, most of them belonging to theHipparcos Input Catalogue, with V from 5mag to 10mag and with knownradial velocities. These observations enlarge the catalogue we began tocompile some years ago to more than 1500 stars. Our catalogue includeskinematic and astrophysical data for each star. Our future goal is toperform an accurate analysis of the kinematical behaviour of these starsin the solar neighbourhood.
|
Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue.
We give a common version of the two catalogues of Mean Radial Velocitiesby Wilson (1963) and Evans (1978) to which we have added the catalogueof spectroscopic binary systems (Batten et al. 1989). For each star,when possible, we give: 1) an acronym to enter SIMBAD (Set ofIdentifications Measurements and Bibliography for Astronomical Data) ofthe CDS (Centre de Donnees Astronomiques de Strasbourg). 2) the numberHIC of the HIPPARCOS catalogue (Turon 1992). 3) the CCDM number(Catalogue des Composantes des etoiles Doubles et Multiples) byDommanget & Nys (1994). For the cluster stars, a precise study hasbeen done, on the identificator numbers. Numerous remarks point out theproblems we have had to deal with.
|
558 peculiar stars discovered at Abastumani
A list of 558 peculiar stars is given: 208 Ap stars, 342 Am stars, sevenobjects with composite spectra, and one Ba II star. All were discoveredat Abastumani Astrophysical Observatory in the course of classifyingstars in the galactic anticenter direction.
|
Not Available
Not Available
|
The absolute magnitude of the AM stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1981A&A....93..155G&db_key=AST
|
Properties of AM stars in the Geneva photometric system
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&A....92..289H&db_key=AST
|
Catalogue of early-type stars measured in a narrow-band photometric system
A compilation of the photoelectric measurements in the Barbier-Morguleffsystem is presented. The catalogue includes data for 773 stars ofspectral type 08 to F6. 706 stars have been measured at least twice.
|
Multicolor photometry of metallic-line stars. III. A photometric catalogue
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974RMxAA...1..175M&db_key=AST
|
Catalogue of AM stars with known spectral types
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973A&AS...10..385H&db_key=AST
|
Catalogue et bibliographie des étoiles A à spectre particulier - Deuxième supplément
Not Available
|
Catalogue et bibliographie des étoiles A à spectre particulier
Not Available
|
