Advertisement

Einstein X-Ray Observations of Planetary Nebulae and their Implications

  • S. P. Tarafdar
  • K. M. V. Apparao
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 131)

Abstract

Central stars of nineteen planetary nebulae were observed for X-ray emission using the Einstein Observatory and four of them were detected. High resolution observations with the Einstein Observatory indicates that the X-ray source in NGC 246 is a point source. These planetary nebulae with positive observations turn out to be the nearest, have the least extinction and also have the largest size of the nebulae around them. It is possible that X-ray emission is observed from these planetary nebulae with larger ages because of the smaller extinction by the nebulae and also due to the settling of heavy elements in the central star which otherwise prevents escape of X-rays by providing opacity.

Keywords

Point Source Heavy Element Central Star Planetary Nebula Main Sequence Star 
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.

Copyright information

© International Astronomical Union 1989

Authors and Affiliations

  • S. P. Tarafdar
    • 1
  • K. M. V. Apparao
    • 1
  1. 1.Tata Institute of Fundamental ResearchBombayIndia

Personalised recommendations