CO J = 3–2 Emission from the "Water Fountain" Sources IRAS 16342-3814 and IRAS 18286-0959

• Imai, Hiroshi

• He, Jin-Hua

• Nakashima, Jun-ichi

• Ukita, Nobuharu

• Deguchi, Shuji

• Koning, Nico

Abstract

We observed CO J = 3–2 emission from "water-fountain" sources, which exhibit high-velocity collimated stellar jets traced by H2O maser emission, with the Atacama Submillimeter Telescope Experiment (ASTE) 10m telescope. We detected CO emission from two sources: IRAS 16342-3814 and IRAS 18286-0959. The IRAS 16342-3814 CO emission exhibits a spectrum that could be well fit to a Gaussian profile, rather than to a parabolic profile, with a velocity width (FWHM) of 158±6 km s^-1 and an intensity peak at V_LSR= 50±2 km s^-1. The mass-loss rate of the star is estimated to be ~2.9×10^-5 M yr^-1. Our morpho-kinematic models suggest that the CO emission is optically thin, and associated with a bipolar outflow rather than with a (cold and relatively small) torus. The IRAS 18286-0959 CO emission has a velocity width (FWHM) of 3.0±0.2 km s ^-1, smaller than typically seen in AGB envelopes. The narrow velocity width of the CO emission suggests that it originates from either an interstellar molecular cloud or a slowly-rotating circumstellar envelope that harbors the H2O maser source.

Journal

• Publications of the Astronomical Society of Japan

  Publications of the Astronomical Society of Japan 61 (6), 1365-1372, 2009

  Astronomical Society of Japan

Keywords

• stars
• AGB and post-AGB -- stars
• individual (IRAS 16342-3814, IRAS 18286-0959)

Details

• CRID: 1050001202612526848
• NII Article ID: 10026422026
• NII Book ID: AA1082896X
• HANDLE: 10232/26220
• NDL BIB ID: 10491093
• ISSN: 00046264
• Web Site: https://ir.kagoshima-u.ac.jp/records/13283
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10491093
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • NDL
  • CiNii Articles
  • KAKEN