Identification of new carbon star candidates in SMC globular cluster NGC 419

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photography, Carbon Stars, Globular Clusters, Imaging Techniques, Magellanic Clouds, Masking, Photographic Plates, Stellar Spectra, Telescopes

Scientific paper

A new photographic masking technique, to reduce the density range of a deep original plate while keeping the fine detail of the image, is applied to a grism survey of the close surroundings of NGC 419, and the efficiency of the grism technique for surveying the carbon stars both in the field and in the globular cluster cores of the Magellanic Clouds is demonstrated. The survey has resulted in the detection of the eight C stars previously known from spectroscopic observations, in the confirmation of two of the three objects classified as C stars by JHK photometry, and in the identification of three new C star candidates, within one arcmin of NGC 419. Observations with the Boller and Chivens spectrograph attached to the 3.6-m ESO telescope obtained with a spectral resolution of 8 A FWHM in the 4500-7000 wavelength range confirm as C stars the candidates AR 1 and No. 25.

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