X-ray observations of planetary nebulae with the Exosat satellite

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167847· OSTI ID:5251105

Apparao, K M.V.; Tarafdar, S P ^[1]

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1. Tata Institute of Fundamental Research, Bombay (India)

Twelve planetary nebulae have been observed with X-ray detectors in the Exosat satellite. Eight planetary nebulae are found to emit detectable X-rays, out of which four are reported here for the first time. Six of these are extended nebulae, while two are nebulae of smaller size. The detection of the six older nebulae agrees with the earlier suggestion that the X-rays from the central star are visible when the nebula disperses or when the heavy elements in the central star atmosphere settle down. In the two nebulae NGC 4361 and NGC 1535, the X-ray luminosity is high enough to ionize carbon in the nebula and to allow the X-radiation emerge without absorption. 12 refs.

• OSTI ID: 5251105
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 344; ISSN ASJOA; ISSN 0004-637X
• 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
ATMOSPHERES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
IONIZATION
IONIZING RADIATIONS
LUMINOSITY
MORPHOLOGY
NEBULAE
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PLANETARY NEBULAE
RADIATIONS
SATELLITES
SIZE
STELLAR ATMOSPHERES
X RADIATION