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Astrophysics and Space Science

, Volume 87, Issue 1–2, pp 121–148 | Cite as

Surface photometry of theHii regions S254–S257

  • S. Mizuno
Article

Abstract

The surface photometry of S254–S257 has been carried out by means of a wide range image processing technique in the reduction system. The photographic plates in the Hα+[NII] andV-bands are taken with the Schmidt telescope. Especially, we have obtained the calibrated map of theHii region, superposing two or more plates with different exposure times, and removing the star images. Three kinds of calibrated maps of theHii regions are drawn: (1)E-map in the (Hα+[NII]+continuum) (2)V-map in the continuum atV-band, (3)(E-V)-map in the (Hα+[NII]) line emission. The intensity profiles across the nebular centers were also obtained. Based on calibrated maps, the morphological structure and mass distribution of S255 and S257 are discussed. The location of observed nebulae on the (mmv) diagram, wherem andmv denote the surface brightness, expressed in the magnitude per square arcmin, is shown together with that of some other nebulae. Some arguements on the age sequence of observedHii regions are presented.

Keywords

Image Processing Exposure Time Mass Distribution Line Emission Processing Technique 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Co. 1982

Authors and Affiliations

  • S. Mizuno
    • 1
  1. 1.Kanazawa Institute of TechnologyKanazawaJapan

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