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The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
| The local system of early type stars - Spatial extent and kinematics
Published uvby and H-beta photometric data and proper motions arecompiled and analyzed to characterize the structure and kinematics ofthe bright early-type O-A0 stars in the solar vicinity, with a focus onthe Gould belt. The selection and calibration techniques are explained,and the data are presented in extensive tables and graphs and discussedin detail. The Gould belt stars of age less than 20 Myr are shown togive belt inclination 19 deg to the Galactic plane and node-lineorientation in the direction of Galactic rotation, while the symmetricaldistribution about the Galactic plane and kinematic properties (purecircular differential rotation) of the belt stars over 60 Myr oldresemble those of fainter nonbelt stars of all ages. The unresolveddiscrepancy between the expansion observed in the youngest nearby starsand the predictions of simple models of expansion from a point isattributed to the inhomogeneous distribution of interstellar matter.
| An investigation of the stellar association containing the 1.95 day Cepheid SU Cassiopeiae
The results of photometric and spectroscopic observations of SU Cas andthe surrounding dust complex are reported. UBV photometry was made ofearly type stars in the dust complex on eight nights in 1978-79 and afurther 10 stars were surveyed within 7 arcmin of SU Cas. Spectroscopicmeasurements were also made of the objects in order to obtain radialvelocities and equivalent widths. The data suggest the region has amoving cluster (BA association) 30 pc in angular extent, with the 1.95arcday Cepheid SU Cas as a member. The association is 255-261 pc distantand has a 6 pc spread between members. The association stars are around120 Myr old, typical of 4 solar mass stars. Finally, the core membersinclude visual and spectroscopic binary system and a short-periodCepheid.
| Radial velocities for early type stars in six galactic regions
Coudespectroscopy has been carried out for 353 stars of spectral typesB0-A0 and V magnitudes between 6.5 and 10.8 m, selected in six regions(three northern and three southern) close to the galactic plane at thegalactic longitudes 135, 175, 315 and 350 deg. The radial velocitieswere obtained by cross-correlating each spectrogram with a referencespectrogram giving an internal error of 1.4 km/s.
| Four-color and H-beta photometry for O-A0 type stars in three regions near the galactic equator
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1982A&AS...49..561W&db_key=AST
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| Takýmyýldýz: | Zincirli Prenses |
| Sað Açýklýk: | 03h15m08.63s |
| Yükselim: | +63°57'29.6" |
| Görünürdeki Parlaklýk: | 8.836 |
| Uzaklýk: | 337.838 parsek |
| özdevim Sað Açýklýk: | 3.1 |
| özdevim Yükselim: | -2.3 |
| B-T magnitude: | 9.052 |
| V-T magnitude: | 8.854 |
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