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arxiv: astro-ph/9908235 · v1 · submitted 1999-08-20 · 🌌 astro-ph

The temperature of non-spherical interstellar grains

N.V. Voshchinnikov (1) , D.A. Semenov (1) , Th. Henning (2) ((1) Sobolev Astronomical Institute , St. Petersburg University , (2) Astrophysical Institute , University Observatory , Friedrich Schiller University , Jena) This is my paper
classification 🌌 astro-ph
keywords grainsinterstellartemperaturenon-sphericalparticlesspheresabsorptivityaspect
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A model of spheroidal particles is used to calculate the steady-state temperature of dust grains immersed in the interstellar radiation field. It is found that the temperature of non-spherical grains with the aspect ratios a/b <= 2 deviates from that of spheres less than 10%. More elongated or flattened particles are usually cooler than spheres of the same mass and in some cases the temperatures may differ by even about a factor of 2. The shape effects increase with the infrared absorptivity of the grain material and seem to be more important in dark interstellar clouds.

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