The ROSAT X-ray spectrum of the Helix Nebula.

Details The ROSAT X-ray spectrum of the Helix Nebula. The ROSAT X-ray spectrum of the Helix Nebula.

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993rmxaa..27..219z&link_type=abstract

Revista Mexicana de Astronomia y Astrofisica, Vol. 27, p. 219 - 222

Astronomy and Astrophysics

Astronomy

3

Planetary Nebulae: X-Ray Spectra, Planetary Nebulae: Temperatures

Scientific paper

The authors have for the first time discovered the existence of two temperature components in the X-ray emission from planetary nebulae. The observed ROSAT PSPC spectrum of the Helix Nebula exhibits a strong peak at about 0.12 keV and a secondary peak at about 0.8 keV. The best model fit results in a temperature of T1 = 1.4×105K for the low-energy component, and a temperature T2 = 8.7×106K for the high-energy component, at hydrogen column density NH = 1.41×1020cm-2. The low-energy component can be attributed to the photosphere of the central star. The high-energy component may be caused by a stellar corona. An alternative explanation is that this hot component is due to plasma in a hot bubble predicted by the interacting wind model. A lower limit of the electron density in the hot plasma is about 10 cm-3.

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