Abstract
We present new observations of seven late-type stars previously discovered in the First Byurakan Survey (FBS). These observations prove that they belong to the family of carbon (C) stars. Seventy-nine similar FBS C stars were previously known. The seven objects under analysis were presented in the FBS lists as M or C star candidates. Among the seven objects, six objects are confirmed by low-resolution spectra of the Hamburg Quasar Objective-Prism Survey. We also present for five of them moderate-resolution spectra obtained at optical wavelengths with a spectrograph equipped with a CCD detector. Three objects can be classified as N-type C stars. One object is an early CH-type C star. Most likely, the star FBS 1339+117 belongs to the group of carbon dwarfs. We estimate distances of these seven new C stars either by using their red-band magnitudes, or by using their near-infrared 2MASS J-KS color and KS-band magnitudes.
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Published in Astrofizika, Vol. 51, No. 2, pp. 255–265 (May 2008).
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Gigoyan, K.S., Engels, D., Mauron, N. et al. Late-type stars found in the FBS. New carbon stars. Astrophysics 51, 209–217 (2008). https://doi.org/10.1007/s10511-008-9009-5
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DOI: https://doi.org/10.1007/s10511-008-9009-5