The Structure of the Small Dark Cloud CB 107

Citations Over TimeTop 20% of 2004 papers

Abstract

This paper presents the near-IR imaging observations of CB 107, a small dark globule projected against a rich stellar background. By means of accurate photometry, the near-IR two-color diagram J - H versus H - K was obtained for the stellar background. This information was used to estimate the color excesses of the detected stars so that, given the reddening curve, it was possible to derive the extinction map of the cloud. The structural properties of the dark globule were investigated by plotting the extinction dispersion σ, obtained in a given spatial box, as a function of the mean extinction AV. This relationship has shown quite a definite linear behavior, with the slope increasing with the box size. The results of the present analysis, compared with those obtained by other authors on larger dark clouds, suggest that for a given spatial scale the slope of the σ versus AV relation is greater in CB 107 than in larger clouds. The so-called Δ-variance method was also used to investigate the structure of the dark globule by evaluating the drift behavior of its extinction map. In this way, we have found that the power spectrum of the extinction map is characterized by a power law with exponent β ~ 2.7. This value is lower than expected, for the same range of spatial scales, on the basis of previous work on large molecular clouds.

Related Papers

• → DOPHOT, a CCD photometry program: Description and tests(1993)821 cited
• → Further Progress in CCD Photometry(1993)43 cited
• → CIE TN 004:2016 The Use of Terms and Units in Photometry ? Implementation of the CIE System for Mesopic Photometry(2016)2 cited
• → Combining Aperture and PSF-Fitting Photometry(2003)
• Progress of photometric analysis of copper in China(2003)