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I. UBV photometry of selected members of the Pleiades and Alpha Persei clusters in 1999
The rotational brightness variations in magnetically active stars aredue to the combined light contribution of cool spots and bright faculaeon the stellar photosphere. The amplitude of the rotational brightnessvariations can be used to probe the dependence of the amount ofphotospheric magnetic fields associated to such inhomogeneities onglobal stellar parameters such as the rotation rate. However, the upperenvelope of the amplitude values must be considered, since therotational modulation amplitude represents a lower limit of the spotsand faculae coverage, being their visibility modulation reduced byseveral factors. In order to determine accurately the maximum amplitudeupper envelope and its dependence on global stellar parameters a programof photometric monitoring of ultra fast rotating active members of thePleiades and Alpha Persei star clusters was undertaken in the fall of1999. Light curves and period determinations of 21 target stars arepresented as result from the first observing season. The newlydetermined values of amplitudes of the brightness variations versusrotation period have values as expected based on previous results.
| 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.
| Mesures de vitesses radiales. VII. Accompagnement AU sol DU programme d'observation DU satellite Hipparcos. Radial velocities. VII. Ground based measurements for Hipparcos.
We publish 734 radial velocities of stars distributed in 28 fields of4x4deg. We continue the PPO series (Fehrenbach et al. 1987; Duflot etal. 1990 and 1992), using the Fehrenbach objective prism method.
| Radial Velocities, Spectral Types, and Luminosity Classes of 820 Stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1950ApJ...112...48M&db_key=AST
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | פרסאוס |
| התרוממות ימנית: | 03h36m04.55s |
| סירוב: | +46°35'04.1" |
| גודל גלוי: | 7.326 |
| מרחק: | 184.843 פארסק |
| תנועה נכונה: | -25.7 |
| תנועה נכונה: | 7.3 |
| B-T magnitude: | 8.724 |
| V-T magnitude: | 7.442 |
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