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Satoshi Takita, Yoshimi Kitamura, Hirokazu Kataza, Daisuke Ishihara, Munetaka Ueno, Hideaki Fujiwara, Norio Ikeda, Akiko Kawamura, Hiroshi Murakami, Yoshiko K. Okamoto, Takashi Onaka, Shinki Oyabu, Itsuki Sakon, Hidenori Takahashi, Diffuse 18 |$\mu$|m Emission around TYC 3159-6-1 Discovered by the AKARI MIR All-Sky Survey, Publications of the Astronomical Society of Japan, Volume 61, Issue 2, 25 April 2009, Pages 291–299, https://doi.org/10.1093/pasj/61.2.291
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Abstract
We report on observations of the mysterious object TYC 3159-6-1 located toward the Cygnus X region. It shows interesting characteristics in the AKARI mid-infrared All-Sky Survey. The central star is clearly detected as a point source at 9 |$\mu$|m, while no point-like source, but a large shell-like structure is seen around the source at 18 |$\mu$|m. The optical spectrum indicates the presence of the weak H|$\alpha$|emission on the red smooth continuum, whereas the mid-infrared |$N$|band spectrum shows neither excess emission nor significant silicate absorption. Interferometric continuum observations at 104 GHz do not show any appreciable peak at the position of the star. On the basis of these observations, we investigate three possibilities of concerning the nature of TYC 3159-6-1: a nearby young stellar object, a heavily extincted high-mass star, and an asymptotic giant branch (AGB) star with a detached shell. We conclude that none of these cases can account for the observations consistently, and the nature of TYC 3159-6-1 remains a mystery.
