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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.
| New observations of six RV Tauri and SRd variable stars
Differential photoelectric observations in the b and y filters of thefour-color system have been obtained of five known or questionable RVTau variable stars and one SRd variable, using the 1.2-meter telescopeat Cloudcroft Observatory. These observations spanned roughly 180 daysfor TT Oph and V564 Oph, with 40 to 50 observations each (every fourthnight on the average). The other four stars, (TX Aql, DW Peg, EI Peg,and Z Sex) were all observed an average of 13 nights, spanning roughly100 nights. One to three cycles were covered for each star. V564 Ophdisplayed an unusual asymmetric deep minimum in its light curve. TT Ophhas adhered closely to its light elements (61.08 d) over the past 43years.
| Measures of 266 double stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1957AJ.....62..153W&db_key=AST
| Studies based on the colors and magnitudes in stellar clusters. VIII. The luminosities and distances of 139 Cepheid variables.
Not Available
| 20 new variable stars in Harvard Map, Nos. 2, 5, 32, 44 and 53
Not Available
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Pozíciós és asztrometriai adatok
| Csillagkép: | Vízöntő |
| Rektaszcenzió: | 20h06m37.45s |
| Deklináció: | +03°51'46.1" |
| Vizuális fényesség: | 10.348 |
| RA sajátmozgás: | -7.8 |
| Dec sajátmozgás: | -9.5 |
| B-T magnitude: | 11.008 |
| V-T magnitude: | 10.403 |
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