ROSAT X-Ray Observations of Four Planetary Nebulae

Abstract

view Abstract Citations (17) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS ROSAT X-Ray Observations of Four Planetary Nebulae Leahy, D. A. ; Zhang, C. Y. ; Volk, K. ; Kwok, Sun Abstract We report ROSAT Position Sensitive Proportional Counter (PSPC) observations of four planetary nebulae. The observations show that all four nebulae have two-component spectra. A two-component model consisting of a blackbody and a Raymond-Smith thermal plasma is fitted to the observed ROSAT PSPC spectra of NGC t535, Abell 36, and NGC 7293. For all three cases, the temperatures of the blackbody component are apparently higher than those of the stellar photo spheres, indicating nonblackbody atmospheres. In all cases, the temperatures of the high-energy component can be attributed to a hot plasma associated with the possible stellar coronae or the "hot bubbles" predicted by the interacting winds model. The spectral energy distribution of NGC t535 is constructed and modeled by incorporating our X-ray spectrum into existing data in UV, optical, near-infrared, and far-infrared wavelengths. Publication: The Astrophysical Journal Pub Date: July 1996 DOI: 10.1086/177514 Bibcode: 1996ApJ...466..352L Keywords: ISM: PLANETARY NEBULAE: INDIVIDUAL NGC NUMBER: NGC 1535; ISM: PLANETARY NEBULAE: INDIVIDUAL NGC NUMBER: NGC 7293; ISM: PLANETARY NEBULAE: INDIVIDUAL NAME: ABELL 36; ISM: PLANETARY NEBULAE: INDIVIDUAL NGC NUMBER: NGC 3587; X-RAYS: ISM full text sources ADS | data products SIMBAD (6) HEASARC (1)