Analysis and models of photoionized structures seen in Hubble Space Telescope images of NGC 7635

Brian D. Moore, J. Jeff Hester, Paul Scowen, Donald K. Walter

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We present the analysis of photoionized structures seen in Hubble Space Telescope Wide Field Planetary Camera 2 images of NGC 7635 and the surrounding H II region S162. We exploit the high spatial resolution images to make a census of the total ionizing flux from the O6.5 IIIf star BD +60°2522. We also construct detailed models of two structures with a photoionization code, reproducing the line emission seen in spatial profiles extracted directly from the images. We demonstrate that the density distribution of the models produces deviations in the spectrally derived elemental abundances at a level exceeding typical observational errors. Our results also show a large discrepancy between the star's effective temperature used for our best-fit models (34,320 K) and that expected based on its spectral type (>40,000 K) from a hot-star calibration taken from the literature. We suggest that this is due to the use of plane-parallel stellar atmospheres in constructing that calibration.

Original languageEnglish (US)
Pages (from-to)3305-3312
Number of pages8
JournalAstronomical Journal
Volume124
Issue number6 1764
DOIs
StatePublished - Dec 1 2002

Keywords

  • H II regions
  • ISM: individual (NGC 7635)
  • ISM: kinematics and dynamics
  • Stars: individual (BD +60°2522)
  • Stars: mass loss

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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