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The Henry Draper Extension Charts: A catalogue of accurate positions, proper motions, magnitudes and spectral types of 86933 stars
The Henry Draper Extension Charts (HDEC), published in the form offinding charts, provide spectral classification for some 87000 starsmostly between 10th and 11th magnitude. This data, being highlyvaluable, as yet was practically unusable for modern computer-basedastronomy. An earlier pilot project (Roeser et al. 1991) demonstrated apossibility to convert this into a star catalogue, using measurements ofcartesian coordinates of stars on the charts and positions of theAstrographic Catalogue (AC) for subsequent identification. We presenthere a final HDEC catalogue comprising accurate positions, propermotions, magnitudes and spectral classes for 86933 stars of the HenryDraper Extension Charts.
| Photoelectric Observations and Minima Times of Four W UMa Systems: LS Del, SW Lac, V839 Oph and AQ Psc
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| Photometry and analysis of the star HD 199 497
Two-color photoelectric observations of the new eclipsing binary HD 199497 are presented. These observations confirm that the system is a W UMatype eclipsing binary. The light curves were analyzed with theWilson-Devinney (1971) approach. The system is found to be in contactconfiguration. The inclination is amazingly small. Although there are nospectroscopic data, the photometric mass ratio of the system is welldetermined.
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