Dust properties of the cometary globule Barnard 207 (LDN 1489)

Abstract

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 ~8,400 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.

13 pages, 11 figures. Accepted for publication in Astronomy & Astrophysics

References in corpus (14)

• The evolution of amorphous hydrocarbons in the ISM: dust modelling from a new vantage point
• Spitzer IRS Spectra and Envelope Models of Class I Protostars in Taurus
• ALMA Observations of Infalling Flows toward the Keplerian Disk around the Class I Protostar L1489 IRS
• Dust variations in the diffuse interstellar medium: constraints on Milky Way dust from Planck-HFI observations
• A hidden reservoir of Fe/FeS in interstellar silicates?
• Extended Red Emission in High-Galactic Latitude Interstellar Clouds
• Dust properties inside molecular clouds from coreshine modeling and observations
• Can we trace very cold dust from its emission alone ?
• Structure and dynamics of the class I young stellar object L1489 IRS
• High-resolution mapping of interstellar clouds with near-infrared scattered light
• Coreshine in L1506C - Evidence for a primitive big-grain component or indication for a turbulent core history?
• Prestellar core modeling in the presence of a filament - The dense heart of L1689B
• A common column density threshold for scattering at 3.6 mum and water-ice in molecular clouds
• Mass estimates for very cold (< 8 K) gas in molecular cloud cores