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astro-ph2001★ 30 cited
Density Variations over Subparsec Scales in Diffuse Molecular Gas
K. Pan, S. R. Federman, D. E. Welty
We present high-resolution observations of interstellar CN, CH, CH^{+}, \ion{Ca}{1}, and \ion{Ca}{2} absorption lines toward the multiple star systems HD206267 and HD217035. Substa…
astro-ph2001★ 24 cited
Physical Conditions in the Foreground Gas of Reflection Nebulae: NGC 2023, vdB 102, and NGC 7023
David C. Knauth, S. R. Federman, K. Pan +2
High resolution optical spectra of HD 37903 and HD 147009, which illuminate the reflection nebulae, NGC 2023 and vdB 102, were obtained for comparison with our results for HD 20077…