Condensations in the planetary nebula NGC 7293 - an origin in circumstellar SiO maser spots?

Astronomy and Astrophysics – Astronomy

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Interstellar Masers, Planetary Nebulae, Red Giant Stars, Silicon Oxides, Starspots, Condensation, Stellar Mass Ejection, Stellar Winds

Scientific paper

NGC 7293 is a planetary nebula containing numerous clumps of gas having linear sizes of about 0.001 pc. It is argued that these clumps are cold (T about 10 K), dense (n about 10 to the 6th/cu cm), and molecular. The survival of clumps during the different stellar mass-loss phases associated with planetary nebula nucleus evolution is considered; it is speculated that the clumps were associated with circumstellar SiO maser spots.

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