Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1576c&link_type=abstract
The Astronomical Journal, v. 114, p. 1576.
Astronomy and Astrophysics
Astronomy
9
Hii Regions, Ism: Kinematics And Dynamics
Scientific paper
The Hourglass region, ionized solely by the star Herschel 36, represents the brightest part of the Lagoon nebula. In this paper, we present new kinematic observations of the region in [N II] 6583 Å emission line using an imaging Fabry-Perot spectrometer in the spectrographic mode. We find both asymmetric and symmetric line profiles with large linewidths of 22-40 km/s towards the regions of the Hourglass and Herschel 36. The H II region of the Hourglass reveals a notable expansion up to -18 km/s with respect to the star. Our kinematic data suggest a particular orientation of the cavities created by the H II region expanding into the parent molecular cloud. Relatively higher velocities of -30 to -50 km/s are observed south of Herschel 36, indicating the presence of low density regions and champagne flow.
Anandarao Boddapati G.
Chakraborty Amit
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