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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.
| Spectroscopic observations of H-alpha emission stars from the Stephenson and Stephenson-Sanduleak lists
Spectroscopic observations were obtained for 111 objects from the listsof H-alpha emission stars of Stephenson (1986) and Stephenson andSanduleak (1977). A total of 26 T Tauri stars, six symbiotic stars,three cataclysmic variables, 17 Be stars, five Me stars, two forbiddenBQ stars, two emission-line galaxies, one planetary nebula, and onecarbon star with Balmer emission was discovered. Descriptions are givenfor the spectra of the more unsual objects. A total of 47 objects failedto show emission.
| New H-alpha emission stars found above 10 deg galactic latitude
Approximately 1300 5.2 x 5.2 deg red-sensitive objective prism plateshave been searched for H-alpha emission stars in order to complete thesearch of the entire sky. The survey here reported represents 59 percentof the whole sky, defined by the region north of declination -25 deg andmostly further than 10 deg from the Galactic plane; the omitted portionshad already been surveyed, in part at Warner and Swasey, in partelsewhere. Two hundred and six stars have been newly found, mostly ofunknown spectral type. The stars' latitude distribution suggests thatthey are mainly moderately high luminosity disk population stars. Thereare new finds especially in Orion and the Taurus dark clouds (limitingmag of about 13).
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| Takýmyýldýz: | Avci |
| Sað Açýklýk: | 05h43m26.76s |
| Yükselim: | +01°23'48.5" |
| Görünürdeki Parlaklýk: | 11.038 |
| özdevim Sað Açýklýk: | 7.5 |
| özdevim Yükselim: | -7.7 |
| B-T magnitude: | 12.541 |
| V-T magnitude: | 11.163 |
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