Journal Article

Detections of SiO and H<sub>2</sub>O Masers in the Bipolar Nebula IRAS 19312+1950

Jun-ichi Nakashima and Shuji Deguchi

in Publications of the Astronomical Society of Japan

Volume 52, issue 5, pages L43-L46
Published in print October 2000 | ISSN: 0004-6264
Published online October 2000 | e-ISSN: 2053-051X | DOI: http://dx.doi.org/10.1093/pasj/52.5.L43
Detections of SiO and H2O Masers in the Bipolar Nebula IRAS 19312+1950

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  • Astrometry and Celestial Mechanics
  • Stars
  • Interstellar Medium

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We report on the detection of SiO and H2O masers toward a newly found bipolar nebula, IRAS 19312+1950. This object exhibits extreme red IRAS color [log (F25/F12) = 0.5 and log (F60/F25) = 0.7] and a nebulosity having a size of about 30″ extended to the south-west in the 2MASS near-infrared image. Toward this object, we have detected emission from the H2O 6(1,6)–5(2,3) transition, the SiO J = 1–0, v = 1 and 2, and J = 2–1, v = 1 transitions, and the SO 2(2)–1(1) and H13CN J = 1–0 transitions. The thermal lines of SO and H13CN are shifted by about 12 km s−1 in radial velocity with respect to the maser lines, indicating that thermal emission comes from the background molecular cloud. However, the SiO J = 2−1, v = 2 spectrum shows another component of SiO emission separated by 26 km s−1 from the main component, that might be formed in a rotating or expanding shell.

Keywords: ISM: molecules; masers; planetary nebulae: individual (IRAS 19312+1950); stars: AGB and post-AGB; stars: mass-loss

Journal Article.  0 words. 

Subjects: Astrometry and Celestial Mechanics ; Stars ; Interstellar Medium

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