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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.
| The Einstein Galactic plane survey. II - Optical observations of Northern Hemisphere X-ray sources
Spectroscopic and photometric observations of 67 Northern-HemisphereX-ray sources from the Einstein Galactic Plane Survey (Hertz andGrindlay, 1984) (HG) are reported. Data obtained at 450-700 nm using the1.5-m telescope at Whipple Observatory and the MMT are combined withpublished observational data in tables, and the identificationalgorithms described by HG are applied. Identifications with opticalobjects are proposed for 45 sources, and it is inferred that most of theothers are noncoronal extragalactic objects. None of the objects can beassigned to the class of low-luminosity accretion sources proposed byHG.
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Sagitta |
| Ascensió Recta: | 20h18m58.70s |
| Declinació: | +20°51'51.9" |
| Magnitud Aparent: | 8.394 |
| Moviment propi RA: | 23.8 |
| Moviment propi Dec: | 3.2 |
| B-T magnitude: | 9.728 |
| V-T magnitude: | 8.505 |
Catàlegs i designacions:
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