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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
| Open clusters with Hipparcos. I. Mean astrometric parameters
New memberships, mean parallaxes and proper motions of all 9 openclusters closer than 300 pc (except the Hyades) and 9rich clusters between 300 and 500 pc have been computed using Hipparcosdata. Precisions, ranging from 0.2 to 0.5 mas for parallaxes and 0.1 to0.5 mas/yr for proper motions, are of great interest for calibratingphotometric parallaxes as well as for kinematical studies. Carefulinvestigations of possible biases have been performed and no evidence ofsignificant systematic errors on the mean cluster parallaxes has beenfound. The distances and proper motions of 32 more distant clusters,which may be used statistically, are also indicated. Based onobservations made with the ESA Hipparcos astrometry satellite
| The Edinburgh-Cape Blue Object Survey - I. Description of the survey
The Edinburgh-Cape Blue Object Survey is a major survey to discover bluestellar objects brighter than B~18 in the southern sky. It is planned tocover an area of sky of 10000 deg^2 with --b-->30 deg and delta<0deg. The blue stellar objects are selected by automatic techniques fromU and B pairs of UK Schmidt Telescope plates scanned with the COSMOSmeasuring machine. Follow-up photometry and spectroscopy are beingobtained with the SAAO telescopes to classify objects brighter thanB=16.5. This paper describes the survey, the techniques used to extractthe blue stellar objects, the photometric methods and accuracy, thespectroscopic classification, and the limits and completeness of thesurvey.
| Far-Ultraviolet Stellar Photometry: Fields Centered on rho Ophiuchi and the Galactic Center
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1996ApJS..104..101S&db_key=AST
| Broad-band photometry of selected southern ultraviolet-bright stars.
Not Available
| Metal-rich globular clusters in the Galaxy. III - The 'X-ray' globular cluster NGC 6441. IV - A color-magnitude diagram for NGC 6304
Results are reported for UBV photoelectric and photographic observationsof about 700 stars in the southern globular cluster NGC 6441 and ofabout 385 stars in or near the G2 globular cluster NGC 6304. Features inthe color-magnitude diagrams of the clusters are found which indicatethat NGC 6441 is one of the most metal-rich clusters known in the Galaxyand that NGC 6304 is a moderately metal-rich cluster. No unusualfeatures in the color-magnitude diagram of NGC 6441 are detected thatmight account for its appearing in the error box of the X-ray source 3U1746-37, except possibly the anomalous position of the variable star V6in the diagram. Estimates are made of the foreground reddening, distancemoduli, and integrated absolute visual magnitudes of both clusters. Itis shown that NGC 6441 has a normal M/L ratio and is located atperigalacticon. NGC 6304 is shown to be located 450 pc above thegalactic plane and possibly to contain two RR Lyrae variables.
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Osservazione e dati astrometrici
| Costellazione: | Scorpione |
| Ascensione retta: | 17h49m07.99s |
| Declinazione: | -36°31'23.9" |
| Magnitudine apparente: | 8.613 |
| Distanza: | 2272.727 parsec |
| Moto proprio RA: | 0.1 |
| Moto proprio Dec: | -0.6 |
| B-T magnitude: | 8.594 |
| V-T magnitude: | 8.612 |
Cataloghi e designazioni:
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