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Absolute proper motions of open clusters. I. Observational data
Mean proper motions and parallaxes of 205 open clusters were determinedfrom their member stars found in the Hipparcos Catalogue. 360 clusterswere searched for possible members, excluding nearby clusters withdistances D < 200 pc. Members were selected using ground basedinformation (photometry, radial velocity, proper motion, distance fromthe cluster centre) and information provided by Hipparcos (propermotion, parallax). Altogether 630 certain and 100 possible members werefound. A comparison of the Hipparcos parallaxes with photometricdistances of open clusters shows good agreement. The Hipparcos dataconfirm or reject the membership of several Cepheids in the studiedclusters. Tables 1 and 2 are only available in electronic form at theCDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| Radial velocities in three fields along the southern galactic equator
A list of radial velocities for 764 stars is given for three fields inthe Vela-Carina region of the galaxy. They were obtained from GPO-platestaken at La Silla and reduced following Fehrenbach's method.Slit-spectra were collected with the 152 cm-spectrographic telescope atLa Silla, to derive an accurate radial velocity for a sufficient numberof calibration stars: out of the 29 stars, 26 had no formerly publishedvalue. The global motions of 10 to 14 km/s can be considered as normalon the basis of galactic rotation. Some stars, however, show highvelocities, and are therefore marked with one or two asterisks in thetable.
| An investigation of the micro-variations of highly luminous OBA type stars. I
Photometric observations of eight OBA stars of absolute bolometricmagnitude brighter than -7 mag, obtained during the Walraven five-colorsimultaneous VBLUW photometer with a 16-arcsec aperture on the 90-cmDutch Light Collector at ESO since 1980 are reported. The data-reductionprocedures are explained; the stability of the comparison stars ischaracterized; and the data are presented in tables and graphs.Brightness variations of 0.01-0.1 mag on time scales of days or weeksare observed in all eight objects, the mean error of the nightlyaverages being about + or - 0.002 mag, and a secular decrease of 0.012mag over about 2 yr is found for HD 37022. The larger variations seen inthe B-U color indices of some of the stars are attributed toshort-period (days or less) variations in temperature and/or densitynear the stellar surfaces.
| Five-channel photometry of cepheids and supergiants in the southern Milky Way.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976A&AS...24..413P&db_key=AST
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| Takýmyýldýz: | Yelken |
| Sað Açýklýk: | 08h46m42.37s |
| Yükselim: | -48°45'59.3" |
| Görünürdeki Parlaklýk: | 8.378 |
| Uzaklýk: | 338.983 parsek |
| özdevim Sað Açýklýk: | -10.8 |
| özdevim Yükselim: | 1.9 |
| B-T magnitude: | 8.321 |
| V-T magnitude: | 8.374 |
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