Volume 605, September 2017
|Number of page(s)||13|
|Section||Interstellar and circumstellar matter|
|Published online||18 September 2017|
Dust properties of the cometary globule Barnard 207 (LDN 1489)⋆
1 Ritter Astrophysical Research centre, The University of Toledo, 2825 West Bancroft Street, Toledo, OH 43606, USA
2 Department of Physics and Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
3 Institute of Engineering, Murray State University, Murray, KY 42071, USA
4 Department of Physics, Montana State University, PO Box 173840, Bozeman, MT 59717, USA
Received: 28 July 2016
Accepted: 4 July 2017
Barnard 207 (B207, LDN 1489, LBN 777), also known as the Vulture Head nebula, is a cometary globule in the Taurus-Auriga-Perseus molecular cloud region. B207 is known to host a Class I protostar, IRAS 04016+2610, located at a projected distance of ~8400 au from the dense core centre. Using imaging and photometry over a wide wavelength range, from UV to sub-mm, we study the physical properties of B207 and the dust grains contained within. The core density, temperature, and mass are typical of other globules found in the Milky Way interstellar medium (ISM). The increase in the dust albedo with increasing optical wavelengths, along with the detection of coreshine in the near infrared, indicates the presence of larger dust grains in B207. The measured optical, near-, mid- and far-infrared intensities are in agreement with the CMM+AMM and CMM+AMMI dust grain type of The Heterogeneous dust Evolution Model for Interstellar Solids (THEMIS), suggesting mantle formation on the dust grains throughout the globule. We investigate the possibility of turbulence being responsible for diffusing dust grains from the central core to external outer layers of B207. However, in situ formation of large dust grains cannot be excluded.
Key words: dust, extinction / ISM: molecules / ISM: general / ISM: individual objects: B207
The reduced images (FITS file) in UV and optical bands are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/605/A99
© ESO, 2017
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