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A Survey of Near-Infrared Emission in Visual Reflection Nebulae

1996; Institute of Physics; Volume: 102; Linguagem: Inglês

10.1086/192262

1538-4365

K. Sellgren, M. W. Werner, L. J. Allamandola,

Astrophysics and Star Formation Studies

view Abstract Citations (37) References (65) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Survey of Near-Infrared Emission in Visual Reflection Nebulae Sellgren, K. ; Werner, M. W. ; Allamandola, L. J. Abstract We present a survey for extended 2.2 μm emission in 20 new visual reflection nebulae, illuminated by stars with temperatures of 3600-33,000 K. We detect extended 2.2 μm emission in 13 new nebulae, illuminated by stars with temperatures of 6800-33,000 K. For most of these 13 nebulae we have measured J - K, H - K, and K - L' and obtained surface brightness measurements at the wavelength of the 3.3 m emission feature. All the reflection nebulae with extended near-infrared emission in excess over scattered starlight have very similar near-infrared colors and show the 3.3 μm feature in emission with similar feature-to-continuum ratios. The 3.3 μm feature-to-continuum ratio ranges from ∼3 to ∼9, both within individual nebulae and from nebula to nebula, which suggests that the 3.3 μm feature and its underlying continuum arise from different materials, or from different ranges of sizes within a size distribution of particles. No dependence on the temperature of the illuminating star is seen in the near-infrared colors or 3.3 m feature-to-continuum ratio, over a factor of 2 in stellar temperature. This is similar to our previous IRAS results, in which we found no dependence of the ratio of 12 μm to 100 μm surface brightnesses in reflection nebulae illuminated by stars with temperatures of 5000-33,000 K. Publication: The Astrophysical Journal Supplement Series Pub Date: February 1996 DOI: 10.1086/192262 arXiv: arXiv:astro-ph/9508054 Bibcode: 1996ApJS..102..369S Keywords: ISM: REFLECTION NEBULAE; INFRARED: ISM: CONTINUUM; INFRARED: ISM: LINES AND BANDS; Astrophysics E-Print: 38 pages (87 kB), AASTex format. Also 7 Postscript figures (80 kB), tarred, compressed and uuencoded, added with 'figure' command. Postscript file or hardcopy available upon request to sellgren@payne.mps.ohio-state.edu. ** Sep. 13, 1995: revised Fig. 1. Compressed postscript text+figs now available at ftp://bessel.mps.ohio-state.edu/pub/sellgren/survey.ps.Z ** Accepted, ApJS (Feb. 1996) full text sources arXiv | ADS | data products SIMBAD (50)