WIDE FIELD CO MAPPING IN THE REGION OF IRAS 19312+1950

Journal Article · Fri Jul 01 00:00:00 EDT 2016 · Astrophysical Journal

DOI:https://doi.org/10.3847/0004-637X/825/1/16· OSTI ID:22666126

Nakashima, Jun-ichi ^[1]; Ladeyschikov, Dmitry A.; Sobolev, Andrej M. ^[2]; Zhang, Yong; Hsia, Chih-Hao ^[3]; Yung, Bosco H. K., ^[4]

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1. Department of Astronomy and Geodesy, Ural Federal University, Lenin Avenue 51, 620000, Ekaterinburg (Russian Federation)
2. Astronomical Observatory, Ural Federal University, Lenin Avenue 51, 620000, Ekaterinburg (Russian Federation)
3. Department of Physics, University of Hong Kong, Pokfulam Road, Hong Kong (China)
4. N. Copernicus Astronomical Center, Rabiańska 8, 87-100 Toruń (Poland)

We report the results of wide field CO mapping in the region of IRAS 19312+1950. This Infrared Astronomical Satellite ( IRAS ) object exhibits SiO/H{sub 2}O/OH maser emission, and is embedded in a chemically rich molecular component, the origin of which is still unknown. In order to reveal the entire structure and gas mass of the surrounding molecular component for the first time, we have mapped a wide region around IRAS 19312+1950 in the {sup 12}CO J = 1–0, {sup 13}CO J = 1–0 and C{sup 18}O J = 1–0 lines using the Nobeyama 45 m telescope. In conjunction with archival CO maps, we investigated a region up to 20′ × 20′ in size around this IRAS object. We calculated the CO gas mass assuming local thermal equilibrium, the stellar velocity through the interstellar medium assuming an analytic model of bow shock, and the absolute luminosity, using the latest archival data and trigonometric parallax distance. The derived gas mass (225 M {sub ⊙}–478 M {sub ⊙}) of the molecular component and the relatively large luminosity (2.63 × 10{sup 4} L {sub ☉}) suggest that the central SiO/H{sub 2}O/OH maser source is a red supergiant rather than an asymptotic giant branch (AGB) star or post-AGB star.

• OSTI ID: 22666126
• Journal Information: Astrophysical Journal, Vol. 825, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASYMPTOTIC SOLUTIONS
CARBON 12
CARBON 13
CARBON MONOXIDE
EMISSION
LUMINOSITY
MASERS
MASS
SATELLITES
SHOCK WAVES
SILICON OXIDES
STARS
TELESCOPES
THERMAL EQUILIBRIUM
VELOCITY