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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.
| Intermediate and narrow band photometry of newly discovered CP 2 stars
From Bidelman's list (1983) of northern stars of astrophysical interesteleven chemically peculiar early type (CP2) stars were photometricallyinvestigated to check the reported CP2 character by means of the Delta-aphotometry and to obtain Stroemgren and H-beta values. The CP2 characterof all stars is verified, in one case the star belongs to a hottersubgroup than reported. One star (BD + 24 deg 3675) turns out to bevariable and shows the largest Delta-a value ever measured. Besidesthis, two stars from the Bright Star Catalogue were found to be CP2stars.
| Objective-prism discoveries in the northern sky. I
Attention is given to 175 northern hemisphere stars whose newlyrecognized peculiar, or otherwise prepossessing characteristics havebeen noted in a preliminary inspection of moderate dispersion objectiveprism plates. The plates were obtained with a 10-deg prism. The starlist gives HD or BD, alpha and delta values, magnitude, and type.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Okcuk |
| Sað Açýklýk: | 19h59m08.06s |
| Yükselim: | +17°58'20.4" |
| Görünürdeki Parlaklýk: | 10.273 |
| özdevim Sað Açýklýk: | -5.3 |
| özdevim Yükselim: | -3.3 |
| B-T magnitude: | 10.308 |
| V-T magnitude: | 10.276 |
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