Steam in RR Telescopii and Henize 2-38

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atmospheric Windows, Carbon Monoxide, Infrared Absorption, Steam, Stellar Spectra, Variable Stars, Absorption Spectra, Helium, Infrared Windows, M Stars, Mira Variables, Stellar Temperature

Scientific paper

Low-resolution scans in the 1.9-2.6 microns atmospheric window reveal steam (H2O) and CO absorption bands in the spectra of the symbiotic stars RR Tel and He 2-38. The steam absorption in RR Tel is particularly intense while the CO is weak, implying the presence in the system of a Mira variable seen near minimum light. In He 2-38 the steam band is weaker while the CO is stronger, as expected for a Mira seen near maximum.

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