Infrared spectra and circumstellar emission of late-type stars. IV - Near-infrared spectra of S-type stars

Details Infrared spectra and circumstellar emission of late-type stars. IV - Near-infrared spectra of S-type stars Infrared spectra and circumstellar emission of late-type stars. IV - Near-infrared spectra of S-type stars

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45...85n&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 1, p. 85-96.

Astronomy and Astrophysics

Astronomy

6

Emission Spectra, Infrared Spectra, S Stars, Stellar Envelopes, Stellar Spectra, Absorption Spectra, Near Infrared Radiation, Stellar Spectrophotometry

Scientific paper

Low-resolution near-infrared (NIR) spectra were obtained for 26 S-type stars in the wavelength region between 2 and 4 microns with a resolution of about 100. We examined the spectral characteristics of S-type stars in the infrared on the basis of both these newly obtained spectral data and previously reported photometric data. All of the stars show CO absorption at about 2.4 microns, and many of them have broad depression in the continua due to H2O absorption centered at about 2.7 microns. The strength of the H2O absorption is probably correlated with the atmospheric C/O ratio and the NIR colors. A few stars show strong excess emission at the L-band in their photometric spectra, which can probably be attributed to thermal emission from circumstellar dust grains. The excess is likely to be seen preferentially in S-type stars. This paper contains the NIR spectra of two stars (S Lyr and IW Cas) showing excess emission. S Lyr is found to have a peculiar NIR spectrum, which shows a rapid flux increase toward longer wavelength, between 3 and 4 microns.

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