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Paper: Infra-Red Characteristics of Faint Galactic Carbon Stars from the First Byurakan Spectral Sky Survey
Volume: 511, Non-Stable Universe: Energetic Resources, Activity Phenomena and Evolutionary Processes
Page: 133
Authors: Kostandyan, G. R.; Gigoyan, K. S.
Abstract: Infra–Red (IR) astronomical databases, namely, IRAS, 2MASS, WISE, and Spitzer, are used to analyze photometric data of 126 carbon (C) stars whose spectra are visible in the First Byurakan Survey (FBS) (Markarian et al. 1989) low–resolution (lr) spectral plates. In this work several IR color–color diagrams are studied. Early and late–type C stars are separated in the JHK Near–Infra–Red (NIR) color–color plots, as well as in the WISE W3–W4 versus W1–W2 diagram. Late N–type Asymptotic Giant Branch (AGB) stars are redder in W1–W2, while early–types (CH and R giants) are redder in W3–W4 as expected. Objects with W2–W3 > 1.0m show double-peaked spectral energy distribution (SED), indicating the existence of the circumstellar envelopes around them. 26 N–type stars have IRAS Point Source Catalog (PSC) associations. The reddest object among the targets is N–type C star FBS 2213+421, which belong to the group of the cold post-AGB R Coronae Borealis (R CrB) variables (Rossi et al. 2016).
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