Einstein X-ray observations of planetary nebulae and their implications

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/166195· OSTI ID:7129499

Tarafdar, S P; Apparao, K M.V.

Central stars of 19 planetary nebulas were observed for X-ray emission using the Einstein Observatory and in four of them X-rays were detected. High-resolution observation with the Einstein Observatory indicates that the X-ray source in NGC 246 is a point source. These planetary nebulas with positive observation turn out to be the nearest, have the least extinction, and also have the largest size of the nebulas in their vicinity. It is possible that X-ray emission is observed from these planetary nebulas with larger ages because of the smaller extinction by the nebulas and also because of the settling of heavy elements in the central star, which would otherwise prevent escape of X-rays by providing opacity. 42 references.

• Research Organization: Tata Institute of Fundamental Research, Bombay (India)
• OSTI ID: 7129499
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 327; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AGE ESTIMATION
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
DWARF STARS
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
NEBULAE
PLANETARY NEBULAE
POINT SOURCES
RADIATION SOURCES
RADIATIONS
SIZE
STARS
WHITE DWARF STARS
X RADIATION