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The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
| Radial velocity measurements. IV - Ground-based accompaniment to the HIPPARCOS observation program
The paper presents 396 radial velocities of stars distributed in 19fields of 4 x 4 degrees. The study employs the Fehrenbach objectiveprism method and the same measuring technique used in a previous paper(Fehrenbach et al., 1987).
| The spectrum of the symbiotic nova HBV 475 in 1969. II
Results are presented of a complete analysis of the first spectroscopicobservations of the symbiotic nova HBV 475 (= V1329 Cyg) obtained withthe 183-cm reflector of the Dominion Astrophysical Observatory inOctober-December 1969. Data show the presence of three main linesystems: (1) narrow lines with a wide ionization range, up to doublyionized CNO, showing a velocity gradient; (2) a broad line system whichincludes the strongest emission lines of H, He II, forbidden Ne III lineand forbidden O III line, which displays a complex structure with up to10 individual components; and (3) a WR-type line system which includesbroad and shallow emissions corresponding to those observed in WN5stars, with a velocity expansion of 2300 km/sec. A binary model of HBV475 is developed, in which the narrow lines are formed in differentregions of the cool giant's wind ionized by the radiation of the hotstar.
| Catalogues of declinations and proper motions of 36 Belgrade zenith stars
Using observations made with the Belgrade zenith telescope in the period1960.0-1981.0, catalogs (in three systems) of the declination and propermotions in declination of 36 zenith stars were calculated for theequinox and epoch of 1970.0. Analyses show that, relatively, the mostaccurate are the system 1 declinations (BZS1 70). The declinationsystems of the present catalogs are in good agreement with thecorresponding FK4 system. But the system of proper motions indeclination is less comparable with the FK4 system. It follows that theBelgrade zenith telescope is capable of yielding star declinations withrelatively high precision (currently about 0.22 arcsec).
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Pozíciós és asztrometriai adatok
| Csillagkép: | Hattyú |
| Rektaszcenzió: | 20h10m09.36s |
| Deklináció: | +45°01'00.2" |
| Vizuális fényesség: | 7.762 |
| Távolság: | 298.507 parszek |
| RA sajátmozgás: | 3.2 |
| Dec sajátmozgás: | 1.3 |
| B-T magnitude: | 7.626 |
| V-T magnitude: | 7.751 |
Katalógusok és elnevezések:
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