SIMBAD references

1998A&A...333L..19A - Astronomy and Astrophysics, volume 333, L19-22 (1998/5-2)

Detection of fine-structure line emission from carbon-rich and oxygen-rich AGB stars by the ISO SWS.

AOKI W., TSUJI T. and OHNAKA K.

Abstract (from CDS):

We detected five forbidden lines of iron, silicon and sulfur in red giants by the ISO SWS. [FeI] 24µm emission was detected in two carbon stars, TX Psc and WZ Cas, and [SI] 25.2µm emission was also detected in TX Psc, while none of these emission lines were detected in an oxygen-rich giant, 30g Her. On the other hand, the [FeII] 26µm, [SiII] 34.8µm and [Fe II] 35.3µm emission lines were detected in the spectrum of 30g Her, while only [Fe II] 26µm was detected in TX Psc. Namely the emission lines of neutral metals were detected in carbon stars while the lines of ions were detected in an oxygen-rich giant. This result suggests that the ionization states of metals in the outer atmosphere as well as the ultraviolet radiation field of carbon stars are different from those of M giants. We estimate that the mass of the line forming region is several x10–6M and the temperature is several hundred Kelvin or higher. This implies that there is a rather dense and warm region close to the star in addition to the well known expanding envelope.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: chromospheres - stars: circumstellar matter - stars: late-type - stars: mass-loss - infrared: stars

Simbad objects: 7

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