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

T. Tsuji, K. Ohnaka, W. Aoki, I. Yamamura

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

114 Citas (Scopus)

Resumen

Our observations with the ISO SWS revealed that H2O band at 2.7 μm appears as absorption already in an M2 giant β Peg and strengthens towards later M giants. Further, CO2 4.2 μm 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 - 1,250 K in M giants as well as in a Mira variable. Absorption features of CO and SiO at 4 μm 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.

Idioma originalInglés
Páginas (desde-hasta)L1-L4
PublicaciónAstronomy and Astrophysics
Volumen320
N.º2
EstadoPublicada - 10 abr. 1997
Publicado de forma externa

Áreas temáticas de ASJC Scopus

  • Astronomía y astrofísica
  • Ciencias planetarias y espacial

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