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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.
| More (on) red giants with unusual dust shells.
Twenty-four M- and MS-stars have been suggested in the literature toshow the silicon carbide feature, indicative of a carbon-richcircumstellar shell. By cross-correlating the IRAS LRS atlas withBidelman's compilation of spectral types for objects in the IRC survey,this sample is enlarged to 39 sources. By carefully examining the LRSspectra, it appears that only one source shows silicon carbide emission.However, there is doubt on the correct association of this IRC sourcewith the IRAS source and on the spectral type of the IRC source. Theremaining objects are shown to have no dust, featureless dust, to showthe characteristic silicate feature at 18μm, or to display a broadfeature from 10-14μm which is known from previous studies on the dustaround M-stars. I conclude that based on the present sample there is noor weak evidence that silicon carbide dust forms in the shells around M-and MS-stars.
| Classification of 831 two-micron sky survey sources south of +5 degrees.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975AJ.....80.1011H&db_key=AST
| The new identifications of the variable stars with the stars from the "Two-Micron Sky Survey - a preliminary catalog" by G. Neugebauer et al. (IRC).
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