The past and present infrared spectrum of BD + 30 ◦ 3639 . Albert A .
نویسنده
چکیده
We present a radiative-transfer calculation which reproduces the infrared spectrum of the planetary nebula BD+303639, fitting both the spectral energy distribution and the spatial extent at infrared wavelengths. We obtain an acceptable fit to most of the spectrum, including the infrared bands. The fit requires a distance of ≥ 2 kpc, which implies that BD+303639 has evolved from a massive progenitor of several solar masses. Two surprising results are (1) a very low dust-to-gas ratio, (2) an absence of the smallest PAH molecules. Extrapolating back in time, we calculate the previous infrared evolution of BD+303639.
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تاریخ انتشار 2008