Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.241..625d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 241, Dec. 15, 1989, p. 625-630.
Astronomy and Astrophysics
Astronomy
74
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.
Dyson John E.
Hartquist Thomas W.
Pettini Marco
Smith Lleweilun J.
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