Photometry of some emission stars of late types in the range 1.47-2.39 microns

Details Photometry of some emission stars of late types in the range 1.47-2.39 microns Photometry of some emission stars of late types in the range 1.47-2.39 microns

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979afz....15..707a&link_type=abstract

(Astrofizika, vol. 15, Oct.-Dec. 1979, p. 707-712.) Astrophysics, vol. 15, no. 4, Apr. 1980, p. 463-466. Translation.

Astronomy and Astrophysics

Astronomy

Infrared Astronomy, Late Stars, Stellar Radiation, Stellar Spectrophotometry, Variable Stars, Infrared Photometry, Spectral Energy Distribution, Stellar Atmospheres, Stellar Temperature, Water Vapor

Scientific paper

Results of infrared photometry of seven late-type emission variable stars are presented. Colors with respect to Epsilon Cygni were measured between 1.47 and 2.39 microns for the stars T Cep, W Cyg, R Ari, R Cyg, R Del, T And and R Leo, and calculated under the assumption that the stars radiate by a Planck law with color temperatures corresponding to their spectral types. All the investigated stars are found to exhibit the water vapor absorption bands at 1.4 and/or 1.9 micron characteristic of M giants, and, except for R Ari, to exhibit the influence of the CO absorption band on 2.39-micron intensity. Excess radiation relative to calculations is observed in R Del and T Cep at 2.17 and 2.23 microns, possibly due to emission in the stellar shells. Finally, measurements of the intensity of the water vapor absorption at 1.98 micron in R Leo are shown to be in agreement with those obtained by Woolf et al. (1964), although the phases and thus effective temperatures of the star were different at the two times, indicating the saturation of the bands.

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