Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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DUST AROUND HERBIG AE/BE STARS

  • Suh, Kyung-Won (Department of Astronomy and Space Science, Chungbuk National University)
  • Received : 2010.10.20
  • Accepted : 2010.12.08
  • Published : 2011.02.28
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Abstract

We model dust around Herbig Ae/Be stars using a radiative transfer model for multiple isothermal circumstellar dust shells to reproduce the multiple broad peaks in their spectral energy distributions (SEDs). Using the opacity functions for various types of dust grains at different temperatures, we calculate the radiative transfer model SEDs for multiple dust shells. For eight sample stars, we compare the model results with the observed SEDs including the Infrared Space Observatory (ISO) and AKARI data. We present model parameters for the best fit model SEDs that would be helpful to understand the overall structure of dust envelopes around Herbig Ae/Be stars. We find that at least four separate dust components are required to reproduce the observed SEDs. For all the sample stars, two innermost dust components (a hot component of 1000-1500 K and a warm component of 300-600 K) with amorphous silicate and carbon grains are needed. Crystalline dust grains (corundum, forsterite, olivine, and water ice) are needed for some objects. Some crystalline dust grains exist in cold regions as well as in hot inner shells.

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References

  1. Bertie, J. E. 1969, Absorptivity of Ice in the Range 4000-30 $cm^{-1}$, The Journal of Chemical Physics, 50, 451
  2. Bohren, C. F., & Huffman, D. R. 1983, Absorption and Scattering of Light by Small Particles (New York: Wiley)
  3. Brittain, S. D., Najita, J. R., & Carr, J. S. 2009, Tracing the Inner Edge of the Disk Around HD 100546 with Rovibrational CO Emission Lines, ApJ, 702, 85 https://doi.org/10.1088/0004-637X/702/1/85
  4. Carrez, P., Demyk, K., Leroux, H., Cordier, P., Jones, P., & d'Hendecourt, L. 2002, Low-temperature Crystallization of $MgSiO_3$ Glasses under Electron Irradiation: Possible Implications for Silicate Dust Evolution in Circumstellar Environments, Meteoritics Planet. Sci., 37, 1615 https://doi.org/10.1111/j.1945-5100.2002.tb00815.x
  5. Fabian, D., Jager, C., Henning, Th., Dorschner, J., & Mutschke, H. 2000, Steps toward Interstellar Silicate Mineralogy. V. Thermal Evolution of Amorphous Magnesium Silicates and Silica, A&A, 364, 282
  6. Fabian, D., Henning, T., Jager, C., Mutschke, H., Dorschner, J., & Wehrhan, O. 2001, Steps toward Interstellar Silicate Mineralogy VI. Dependence of Crystalline Olivine IR Spectra on Iron Content and Particle Shape, A&A, 378, 228 https://doi.org/10.1051/0004-6361:20011196
  7. Henning, Th., Begemann, B., Mutschke, H., & Dorschner, J. 1995, Optical Properties of Oxide Dust Grains, A&AS, 112, 143
  8. Hillenbrand, L. A., Strom, S. E., Vrba, F. J., & Keene, J. 1992, Herbig Ae/Be Stars - Intermediate-Mass Stars Surrounded by Massive Circumstellar Accretion Disks, ApJ, 397, 613 https://doi.org/10.1086/171819
  9. Ivezic, A., & Elitzur, M. 1997, Self-Similarity and Scaling Behaviour of Infrared Emission from Radiatively Heated Dust - I. Theory, MNRAS, 287, 799 https://doi.org/10.1093/mnras/287.4.799
  10. Jager, C., Molster, F. J., Dorschner, J., Henning, Th., Mutschke, H., & Waters, L. B. F. M. 1998, Steps toward Interstellar Silicate Mineralogy IV. The Crystalline Revolution, A&A, 339, 904
  11. Juhasz, A., Bouwman, J., Henning, Th., Acke, B., van den Ancker, M. E., Meeus, G., Dominik, C., Min, M., Tielens, A. G. G. M., & Waters, L. B. F. M. 2010, Dust Evolution in Protoplanetary Disks Around Herbig Ae/Be Stars- the Spitzer View, ApJ, 721, 431 https://doi.org/10.1088/0004-637X/721/1/431
  12. Kimura, Y., Miyazaki, Y. Kumamoto, A., Saito, M., & Kaito, C. 2008, Characteristic Low-Temperature Crystallization of Amorphous Mg-bearing Silicate Grains under Electron Irradiation, ApJ, 680L, 89
  13. Malfait, K., Bogaert, E., & Waelkens, C. 1998, An Ultraviolet, Optical and Infrared Study of Herbig Ae/Be Stars, A&A, 331, 211
  14. Mannings, V. 1994, Submillimetre Observations of Herbig Ae/Be Systems, MNRAS, 271, 587 https://doi.org/10.1093/mnras/271.3.587
  15. Meeus, G., Waters, L. B. F. M., Bouwman, J., van den Ancker, M. E., Waelkens, C., & Malfait, K. 2001, ISO Spectroscopy of Circumstellar Dust in 14 Herbig Ae/Be Systems: Towards an Understanding of Dust Processing, A&A, 365, 476 https://doi.org/10.1051/0004-6361:20000144
  16. Miroshnichenko, A., Ivezic, Z., Vinkovic, D., & Elitzur, M. 1999, Dust Emission from Herbig Ae/Be Stars: Evidence for Disks and Envelopes, ApJ, 520, 115L https://doi.org/10.1086/312159
  17. Suh, K.-W. 1999, Optical Properties of the Silicate Dust Grains in the Envelopes around AGB Stars, MNRAS, 304, 389 https://doi.org/10.1046/j.1365-8711.1999.02317.x
  18. Suh, K.-W. 2000, Optical Properties of the Carbon Dust Grains in the Envelopes around AGB Stars, MNRAS, 315, 740 https://doi.org/10.1046/j.1365-8711.2000.03482.x
  19. Suh, K.-W., Kim, M.-R., & Baek, J.-H. 2002, A Study of ISO Spectra for Herbig Ae/Be Stars, JASS, 19, 255
  20. Tamanai, A., Mutschke, H., Blum, J., Posch, Th., Koike, C., & Ferguson, J. W. 2009, Morphological Effects on IR Band Profiles. Experimental Spectroscopic Analysis with Application to Observed Spectra of Oxygen-Rich AGB Stars, A&A, 501, 251 https://doi.org/10.1051/0004-6361/200911614
  21. Towers, I. N., & Robinson, G. 2009, A Model for Multiple Isothermal Circumstellar Dust Shells, Physica Scripta, 80, 015901 https://doi.org/10.1088/0031-8949/80/01/015901
  22. van den Ancker, M. E., The, P. S., Tjin A Djie, H. R. E., Catala, C., de Winter, D., Blondel, P. F. C., & Waters, L. B. F. M. 1997, Hipparcos Data on Herbig Ae/Be Stars: an Evolutionary Scenario, A&A, 324L, 33
  23. Waters, L. B. F. M., & Waelkens, C. 1998, Herbig Ae/Be Stars, ARA&A, 36, 233 https://doi.org/10.1146/annurev.astro.36.1.233
  24. Whitney, B. A., Wood, K., Bjorkman, J. E., & Wolff, M. J. 2003, Two-Dimensional Radiative Transfer in Protostellar Envelopes. I. Effects of Geometry on Class I Sources, ApJ, 591, 1049 https://doi.org/10.1086/375415

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