Grain Properties in the rho Ophiuchi Dark Cloud
Grain Properties in the rho Ophiuchi Dark Cloud
复制标题
rho Ophiuchi 暗云中的颗粒特性
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
S. Tapia
中科院分区：
文献类型：
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作者：
F. Vrba;G. Coyne;S. Tapia
我们对蛇夫座暗云中的尘埃颗粒进行了全面的研究。通过结合134颗恒星的新的偏振、光学光度和光谱分类数据，云物质被探测到A V≤5-7 MAG的吸收深度。对于用色差法测定R的恒星，在平均消光A V=3.25mag时，R的平均值为3.99±0.18。在R=5.7λmax时，R与最大偏振波长成比例关系，这与其他研究的结果一致。根据λ最大值推算出的颗粒尺寸随着光学厚度的增加而增加，其方式与湍流驱动的凝聚颗粒生长的简单模型相一致。
We present a comprehensive study of dust grains in the p Ophiuchi dark cloud. By combining new polarimetric, optical photometric, and spectral classification data for 134 stars, cloud material is probed to an absorption depth of A V ≤ 5-7 mag. For stars with R determined from the color-difference method, a mean value of R = 3.99 ± 0.18 at a mean extinction of A V = 3.25 mag is found. R scales with the wavelength of maximum polarization at the rate R = 5.7λ max , consistent with results from other studies. Grain size, as deduced from λ max , increases with optical depth in a manner that is consistent with a simple model of turbulence-driven coagulative grain growth