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Overlapping Open Clusters NGC 1750 and NGC 1758 Behind the Taurus Dark Clouds. II. CCD Photometry in the Vilnius System
Seven-color photometry in the Vilnius system has been obtained for 420stars down to V = 16 mag in the area containing the overlapping openclusters NGC 1750 and NGC 1758 in Taurus. Spectral and luminosityclasses, color excesses, interstellar extinctions and distances aregiven for 287 stars. The classification of stars is based on theirreddening-free Q-parameters. 18 stars observed photoelectrically wereused as standards. The extinction vs. distance diagram exhibits thepresence of one dust cloud at a distance of 175 pc which almostcoincides with a distance of other dust clouds in the Taurus complex.The clusters NGC 1750 and NGC 1758 are found to be at the same distanceof ~ 760 pc and may penetrate each other. Their interstellarextinction A_V is 1.06 mag which corresponds to EB-V = 0.34mag.
| Mesures d'etoiles doubles faites a Nice, etoiles doubles nouvelles (24eme serie) decouvertes a Nice.
Table 1 gives 1182 measurements of 682 binaries observed with the 74 and50 cm refractors. Table 2 lists 26 new binaries discovered with the 50cm refractor.
| Probable open clusters NGC 1750 and NGC 1758 behind the Taurus dark clouds
The area of 2.5 x 2.5 deg in the direction of the Taurus dark cloudscontaining stellar groupings NGC 1746, NGC 1750, and NGC 1758 isinvestigated in the Vilnius photometric system. Magnitudes V, colorindices, color excesses, interstellar extinctions, and distances aredetermined for 116 stars, some of which are as faint as V = 13. It isconcluded that NGC 1746 is probably not a cluster. Other two groupingsof stars, NGC 1750 and NGC 1758, if real, may be open clusters at 510and 680 pc distances. Interstellar reddenings E(B-V) of both groups are0.42 and 0.37 mag, respectively. The distance of the Taurus dark cloudsin the area is found to be 175 pc, i.e. by 45 pc larger than in otherdirections farther to the south from the galactic equator.
| ICCD speckle observations of binary stars. II - Measurements during 1982-1985 from the Kitt Peak 4 M telescope
This paper represents the continuation of a systematic program of binarystar speckle interferometry initiated at the 4 m telescope on Kitt Peakin late 1975. Between 1975 and 1981, the observations were obtained witha photographic speckle camera, the data from which were reduced byoptical analog methods. In mid-1982, a new speckle camera employing anintensified charge-coupled device as the detector continued the programand necessitated the development of new digital procedures for reducingand analyzing speckle data. The camera and the data-processingtechniques are described herein. This paper presents 2780 newmeasurements of 1012 binary and multiple star systems, including thefirst direct resolution of 64 systems, for the interval 1982 through1985.
| Measurements of double stars made at Nice
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975A&AS...20..391C&db_key=AST
| Mesures d'étoiles doubles faites à Nice
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972A&AS....6..185C&db_key=AST
| Mesures d'etoiles doubles faites a Nice a la lunette de 50 cm.
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| Etoiles doubles nouvelles (3e serie) decouvertes a Nice avec la lunette de 50 centimetres.
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Observation and Astrometry data
| Constellation: | Taureau |
| Right ascension: | 05h07m09.96s |
| Declination: | +22°23'37.0" |
| Apparent magnitude: | 8.503 |
| Proper motion RA: | 25.2 |
| Proper motion Dec: | -28.6 |
| B-T magnitude: | 9.188 |
| V-T magnitude: | 8.56 |
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