/ftp/cats/III/132



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III/132     Southern Galactic Carbon Stars - Near-IR Spectra   (MacConnell 1988)
The following files can be converted to FITS (extension .fit or fit.gz)
	catalog.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=III/132
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Beginning of ReadMe : III/132 Southern Galactic Carbon Stars - Near-IR Spectra (MacConnell 1988) ================================================================================ New Galactic Carbon Stars Found on Southern, Near-Infrared Spectrum Plates MacConnell D.J. <Astron. J, 96, 354 (1988)> =1988AJ.....96..354M ================================================================================ ADC_Keywords: Stars, carbon Abstract: Over 400 cool carbon stars were found on near-infrared spectrum plates of low-dispersion taken along the southern galactic plane. This represents an approximate 10% increase in the number of such stars known. Introduction: About 4000 optically detected carbon stars are known in the Galaxy, largely concentrated toward the galactic plane and to galactocentric distances greater than the solar circle, and significant numbers have been detected in the Magellanic Clouds and other Local Group galaxies. They are readily distinguished from stars of the normal, oxygen-rich sequence by the presence of strong bands of diatomic carbon (the defining characteristic) and of CN in their spectra, and the majority of the galactic ones have been found on red and near- infrared (lambda < 0.9 u) photographic plates taken with objective prisms mounted on Schmidt telescopes. In the early 1970's MacConnell began taking infrared plates of dispersion 3400AA/mm at the A-band with the Curtis Schmidt telescope at Cerro Tololo to search for cool supergiants and other stars of interest. Plates were taken along the full galactic half-circle, from l=210 to l=30, covering a band roughly 13 degrees wide centered on the galactic plane. There are typically three unwidened I-N plates on each 5x5-degree field of 5 min, 30 min, and 60 min exposure; the deep plates are ammonia-sensitized and reach I 13. The spectra cover the 680-880nm region, and the features which distinguish carbon stars in this region are the strong CN bands at 7945, 8125, and 832nm. In order for a star to be classified as carbon, it must show C bands, but these are present only blueward of the spectral range used. Stars with CN bands strong enough to be seen at this low dispersion are invariably carbon stars, usually of the cool N variety, but a survey of this type will find relatively few of the weaker-banded stars of the warmer R subtype. Table I (file "catalog.dat") presents the new carbon stars found, in order of R.A. 1950, as well as several dozen stars in Stephensons's catalogue (column GCCCS) for which improved coordinates were obtained in the present program. are accurate to about 5 arcsec in declination and to about 3 arcsec in right ascension. The visual magnitudes are estimated from a mean calibration applied to a set of direct, visual region plates of 5min exposure taken with the same telescope, and the error is probably of the order of 1mag.