9+ frequencies for V534 Tauri, a δ Scuti variable in the Pleiades. Results of the STEPHI IX campaign
New observations of V534 Tau were performed during the STEPHI IXcampaign in November 1998. An overall run of 285 h of data has beencollected from three sites over a period of 23 days. Period analysisreveals a rich oscillation spectrum with nine frequencies above the 99%confidence level. This oscillation spectrum spans a large range offrequencies, from 179 to 525 μHz (15.52 to 45.36 cycles per day). Apreliminary comparison with models suggests that the observed modeswould lie in the range of modes from g1 or g2 top4 or p5, depending on the rotation rateconsidered for V534 Tau.Table \ref{tab1} is only available in electronic form athttp://www.edpsciences.org
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New delta Scuti variable in the Pleiades: HD 23628.
We report here the discovery of very low amplitude oscillations in thePleiades star HD 23628. The 14-nights high quality light curvedesignates HD 23628 as a new member of the δ Scuti stars class.Amplitude spectra indicate a multi-periodic pulsation behaviour, andfour pulsation frequencies have been detected so far. The frequencydistribution suggests the presence of nonradial modes. Pulsationconstant values of the four modes are distributed in the rangecorresponding to fundamental f to p4 radial modes.
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The Pleiades, Map-based Trigonometric Parallaxes of Open Clusters. V.
The Multichannel Astrometric Photometer and Thaw Refractor (Thaw/MAP) ofthe University of Pittsburgh's Allegheny Observatory have been used todetermine the trigonometric parallax of the Pleiades star cluster. Theparallax determined, 0.00764" with a standard error of +/-0.00043"(corresponding to a distance modulus of 5.59+/-0.12 mag) places thecluster significantly further away than indicated by the mean parallaxof cluster members drawn from the Hipparcos catalog. The distancederived here is in general agreement with values based on main-sequencefitting, indicating that cluster members are not subluminous assuggested by the Hipparcos-based results. The current study combines thedata from our initial study of this cluster with new observations ofthat region and of a second Pleiades region in an overlappingconfiguration. It thus supersedes our first determination of theparallax of the Pleiades cluster. A third Pleiades field is beingselected for future measurement of the cluster's trigonometric parallax,and assistance with the luminosity classification of reference stars issought.
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High-precision positions and proper motions of 441 stars in the Pleiades astrometric standard region.
Not Available
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A preliminary compilation of DS-programme star positions
A catalog is presented of the double-star-program (DS-program) starpositions, listing right ascensions for 930 DSs and declinations for1225 DSs of the program. The positions were compiled from the observedvalues obtained between 1980 and 1987 with the meridian circles of sixUSSR observatories (the Moscow, Kazan', Kiev, Khar'kov, Odessa, andTashkent Observatories) and the Belgrade Observatory. The measurementsand the treatment of the observational material were performed using therelative method, and the FK-4 system stars were used as reference stars.
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Determination of the Proper Motions for Stars in the Region of the Pleiades - Part One
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A spectroscopic investigation of the Pleiades.
Not Available
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Catalog of Indidual Radial Velocities, 0h-12h, Measured by Astronomers of the Mount Wilson Observatory
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970ApJS...19..387A&db_key=AST
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Accurate positions of 502 stars in the region of the Pleiades
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Star in the group of the Pleiades but not belonging to the physical system.
Not Available
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Photovisual magnitudes of the stars in the Pleiades.
Not Available
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