Publications of The Korean Astronomical Society (천문학논총)

The Korean Astronomical Society (한국천문학회)
권호 표지
DOI QR코드

DOI QR Code

PHYSICAL AND CHEMICAL PROPERTIES OF PLANETARY NEBULAE WITH WR-TYPE NUCLEI

  • DANEHKAR, ASHKBIZ (Department of Physics and Astronomy, Macquarie University) ;
  • WESSON, ROGER (European Southern Observatory) ;
  • KARAKAS, AMANDA I. (Research School of Astronomy & Astrophysics, Australian National University) ;
  • PARKER, QUENTIN A. (Department of Physics and Astronomy, Macquarie University)
  • Received : 2014.11.30
  • Accepted : 2015.06.30
  • Published : 2015.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

We have carried out optical spectroscopic measurements of emission lines for a sample of Galactic planetary nebulae with Wolf-Rayet (WR) stars and weak emission-line stars (wels). The plasma diagnostics and elemental abundance analysis have been done using both collisionally excited lines (CELs) and optical recombination lines (ORLs). It was found that the abundance discrepancy factors ($ADF{\equiv}ORL/CEL$) are closely correlated with the difference between temperatures derived from forbidden lines and those from $He\;{\small{I}}$ recombination lines, implying the existence of H-deficient materials embedded in the nebula. The $H{\beta}$ surface brightness correlations suggest that they might be also related to the nebular evolution.

Keywords

References

  1. Danehkar, A., 2014, PhD thesis, Macquarie University
  2. Danehkar, A., Parker, Q. A., & Ercolano, B., 2013, Observations and Three-dimensional Ionization Structure of the Planetary Nebula SuWt 2, MNRAS, 434, 1513 https://doi.org/10.1093/mnras/stt1116
  3. Danehkar, A., Todt, H., Ercolano, B. & Kniazev, A. Y., 2014, Observations and Three-dimensional Photoionization Modelling of the Wolf-Rayet Planetary Nebula Abell 48, MNRAS, 439, 3605 https://doi.org/10.1093/mnras/stu203
  4. Dopita, M. A. & Meatheringham, S. J. 1990, The Evolutionary Sequence of Planetary Nebulae, ApJ, 357, 140 https://doi.org/10.1086/168900
  5. Dopita, M. et al., 2010, The Wide Field Spectrograph (WiFeS): performance and data reduction, ap&ss, 327, 245 https://doi.org/10.1007/s10509-010-0335-9
  6. Karakas, A. I., van Raai, M. A., Lugaro, M., Sterling N. C., & Dinerstein. H. L. 2009, ApJ, 690, 1130 https://doi.org/10.1088/0004-637X/690/2/1130
  7. Kingsburgh, R. L. & Barlow, M. J., 1994, Nucleosynthesis Predictions for Intermediate-Mass Asymptotic Giant Branch Stars: Comparison to Observations of Type I Planetary Nebulae, MNRAS, 271, 257 https://doi.org/10.1093/mnras/271.2.257
  8. Liu, Y., Liu, X. -W., Barlow, M. J., & Luo, S. -G., 2004, Chemical Abundances of Planetary Nebulae from Optical Recombination Lines - II. Abundances Derived from Collisionally Excited Lines and Optical Recombination Lines, MNRAS, 353, 1251 https://doi.org/10.1111/j.1365-2966.2004.08156.x
  9. O'Dell, C. R., 1962, A Distance Scale for Planetary Nebulae Based on Emission-Line Fluxes, ApJ, 135, 371 https://doi.org/10.1086/147277
  10. Peimbert, M., 1967, Temperature Determinations of H II Regions, ApJ, 150, 825 https://doi.org/10.1086/149385
  11. Tsamis, Y. G., Barlow, M. J., Liu, X. -W., Storey, P. J., & Danziger, I. J., 2004, A deep survey of heavy element lines in planetary nebulae - II. Recombination-line abundances and evidence for cold plasma, MNRAS, 353, 953 https://doi.org/10.1111/j.1365-2966.2004.08140.x
  12. Wesson, R. & Liu, X. -W., 2004, Physical conditions in the planetary nebula NGC 6543, MNRAS, 351, 1026 https://doi.org/10.1111/j.1365-2966.2004.07856.x
  13. Wesson, R., Liu, X. -W., & Barlow, M. J., 2005, The abundance discrepancy - recombination line versus forbidden line abundances for a northern sample of galactic planetary nebulae, MNRAS, 362, 424 https://doi.org/10.1111/j.1365-2966.2005.09325.x