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Lithium and metal abundances in long period AM binaries
High signal-to-noise CCD spectra of three bright, long period Ambinaries (HD108651, HD116657 and HD138213) have been obtained and theatmospheric abundances of identified chemical elements were studied. Wefound HD116657 to be a new candidate as a Li deficient, long period Ambinary, in addition to 16 Ori. While HD108651 and HD116657 havepronounced Am characteristics, HD138213 is just a mild Am star. Thesestars were further studied in a more general context related to the roleof binarity in CP phenomenon. It was found that both Li abundance andthe equivalent with ratio Cariptsize I,6718/Feriptsize I,6679 are morepeculiar in systems with more pronounced eccentricities. Such behaviouris the opposite of what was previously found in Ap binaries and theiranomalies. It indicates that tidal effects are of crucial importance indriving CP phenomena. Based on observations collected at theNational\break Astronomical Observatory Rozhen, Bulgaria.
| 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.
| Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.
| The Spectrum of Tonantzintla 1542
Not Available
| The Optical Spectrum of 3c 273.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1965ApJ...141....6O&db_key=AST
| Sur quelques étoiles variables peu observées
Not Available
| Mesures d'étoiles doubles effectuées au télescope de 80 cm. de l'Observatoire de Marseille
Not Available
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Virgo |
| Ascensió Recta: | 12h28m18.42s |
| Declinació: | +04°23'47.6" |
| Magnitud Aparent: | 6.726 |
| Distancia: | 122.399 parsecs |
| Moviment propi RA: | -45.6 |
| Moviment propi Dec: | -16.6 |
| B-T magnitude: | 6.901 |
| V-T magnitude: | 6.741 |
Catàlegs i designacions:
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