Study of L 688/L 694/L 700: A complex of dark clouds in Aquila

Akiko Kawamura, Maria Kun, Toshikazu Onishi, Roland Vavrek, István Domsa, Akira Mizuno, Yasuo Fukui

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11 Citations (Scopus)

Abstract

We present the results of optical and radio molecular observations of the small dark clouds L 688, L 694, and L 700 (CB 200). Based on star counts, we found a distance of 230 ± 30 pc for the clouds. We present extinction maps of the clouds based on the USNO Catalog data. Our objective prism search for candidate pre-main-sequence stars resulted in the detection of an Hα emission star in the cloud area. We observed the clouds in the 12CO (1-0), 13CO (1-0), and C18O (1-0) lines. A ring-shaped cloud of ∼ 430 M was detected from the 12CO observation. Five 13CO cores were identified. Three C18O cores with N (H2) ∼ (5.3-7.6) × 1021Cm-2 reside in two of the 13CO cores in the northern part of the cloud. The density gradient seen in optical, infrared and radio, and also the positions of the star-formation sites may suggest the possibility of shock compression due to some stars or SNRs near the galactic plane.

Original languageEnglish
Pages (from-to)1097-1108
Number of pages12
JournalPublications of the Astronomical Society of Japan
Volume53
Issue number6
DOIs
Publication statusPublished - Jan 1 2001

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Keywords

  • ISM: Clouds
  • ISM: Dust, extinction
  • ISM: Individual (L 688, L 694, L 700)
  • ISM: Molecules
  • Stars: Emission line
  • Stars: Formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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