Optical, radio, and infrared observations of compact H II regions. V - The Hourglass in M8

Details Optical, radio, and infrared observations of compact H II regions. V - The Hourglass in M8 Optical, radio, and infrared observations of compact H II regions. V - The Hourglass in M8

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..870w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, April 1986, p. 870-889. Research supported by the Xerox Corp. and New York State

Astronomy and Astrophysics

Astronomy

29

Astronomical Photometry, Astronomical Spectroscopy, H Ii Regions, Infrared Astronomy, Nebulae, Radio Sources (Astronomy), Astronomical Maps, Cosmic Dust, Emission Spectra, Polarimetry, Radio Interferometers, Visible Spectrum

Scientific paper

Multiwavelength observations of the inner core of the M8 Hourglass region are presented, including VLA interferometric maps, 2-4 micron and 8-13 micron spectroscopy, photometric mapping in the K (2.2 micron) and L (3.45 micron) bands and in the 3.28 micron dust-emission feature, optical CCD imaging, and optical and infrared polarimetry. The compact H II region is excited by the O7 V star Herschel 36, and its apparent bipolar structure at optical wavelengths may be due to variable line-of-sight extinction and scattered light. Standard reddening laws are not applicable in the Hourglass region. A power law extinction lambda exp -0.78 yields consistent agreement between ultraviolet, optical, and infrared extinction estimates and suggests that one component of the total grain distribution is on the average larger than that found in the interstellar medium. The spatial distribution of the 3.28 micron dust-emission feature shows that the feature emission is associated with the boundary layer in the H II region/molecular cloud interface. The observations favor models in which feature emission comes from small refractory grains rather than from fluorescence or thermal emission from volatile mantles.

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