Observations of an expanding molecular ring in S106

Robert Loushin, Richard M. Crutcher, John H. Bieging

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


We have mapped the 3 mm rotational transition of HCO+ toward S106 with the Berkeley-Illinois-Maryland Array and the NRAO 12 m telescope. The maps show evidence for an expanding molecular ring around IRS 4, the exciting star in S106. The radius of the ring is about 2 × 1017 cm, and its mass is ≤ 10 M. The ring is expanding with a velocity of about 2 km s-1. The ring cannot be supported by rotation; magnetic fields and gas pressure may be important in determining the kinematics of the region. We also observe clumps of high-velocity material which may have been ablated from the ring and entrained in the ionized bipolar outflow.

Original languageEnglish (US)
Pages (from-to)L67-L69
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - Oct 20 1990


  • Interstellar: matter
  • Nebulae: individual (S106)
  • Stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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