High-resolution X-ray Spectroscopy of BD +30 3639

Details High-resolution X-ray Spectroscopy of BD +30 3639 High-resolution X-ray Spectroscopy of BD +30 3639

2006-07-07

arxiv.org/abs/astro-ph/0607154v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; to appear in proceedings of IAU Symposium 234, "Planetary Nebulae in Our Galaxy and Beyond," eds. R. Mende

Scientific paper

10.1017/S1743921306002936

We present preliminary results from the first X-ray gratings spectrometer observations of a planetary nebula (PN). We have used the Chandra X-ray Observatory Low Energy Transmission Gratings Spectrometer (LETGS) to observe the bright, diffuse X-ray source within the well-studied BD +30 3639. The LETGS spectrum of BD +30 3639 displays prominent and well-resolved emission lines of H-like C, O, and Ne and He-like O and Ne. Initial modeling indicates a plasma temperature T_x ~ 2.5x10^6 K and abundance ratios of C/O ~ 20, N/O <~ 1, Ne/O ~ 4, and Fe/O <~ 0.1. These results suggest that the X-ray-emitting plasma is dominated by the shocked fast wind from the emerging PN core, where this wind gas likely originated from the intershell region of the progenitor asymptotic giant branch star.

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