SIMBAD references

1997A&A...320L...1T - Astronomy and Astrophysics, volume 320, L1-4 (1997/4-2)

Warm molecular envelope of M giants and Miras: a new molecule forming region unmasked by the ISO SWS.


Abstract (from CDS):

Our observations with the ISO SWS revealed that H2O band at 2.7µm appears as absorption already in an M2 giant β Peg and strengthens towards later M giants. Further, CO2 4.2µm band appears as absorption in an M7 giant SW Vir and especially strong in a Mira variable S Vir. The excitation temperatures of these molecular bands estimated from their band shapes turn out to be 750-1,250K in M giants as well as in a Mira variable. Absorption features of CO and SiO at 4µm region appear to be weaker in cooler M giants and almost disappear in S Vir (Mira), suggesting filling in by the emission of CO and SiO themselves. The absorption and/or emission may be produced in a rather warm molecule forming region above the photosphere. This molecular envelope should be related to the quasi-static molecular zone previously suggested from the high resolution FTS spectra of CO in the near IR.

Abstract Copyright:

Journal keyword(s): Infrared: stars - molecular processes - stars: atmospheres - stars: circumstellar matter - stars: late-type

Simbad objects: 6

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