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Collinder 110: an Old Open Cluster in Monoceros
Results of photoelectric UBVRI photometry of 78 stars and photographicPDS and CCD photometry for 437 stars are presented for Collinder 110, anold open cluster at low Galactic latitude. Proper motions obtained fromLick Sky Survey plates were used to identify 39 stars as foregroundobjects. The cluster's reddening, distance, and age are estimated as E(B- V) = 0.50 +/- 0.03 mag, r = 1950 +/- 300 pc, and t = 1.4 +/- 0.3 Gyr,assuming a solar metal abundance.
| 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.
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