1.2 and 2.2 micron light curves of W UMa type stars

Details 1.2 and 2.2 micron light curves of W UMa type stars 1.2 and 2.2 micron light curves of W UMa type stars

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.188..421j&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 188, Aug. 1979, p. 421-427.

Astronomy and Astrophysics

Astronomy

16

Eclipsing Binary Stars, Infrared Astronomy, Light Curve, Colorimetry, Line Spectra, Stellar Magnitude

Scientific paper

Infrared light curves observed at wavelengths of 1.2 and 2.2 microns are presented for the W UMa-type eclipsing binaries 44 i Boo, AB And, and SW Lac. Features of the IR light curves are discussed and compared with optical light curves. It is found that: (1) the IR color indices of all three stars are very red for their spectral type; (2) the primary and secondary minimum eclipse depths are much more nearly equal at 1.2 and 2.2 microns than in the optical light curves; (3) the depths of both minima are smaller in the IR than in the optical; (4) the maxima in both the IR and the optical are variable; and (5) the 2.2-micron secondary minimum in both 44 i Boo and AB And are peculiar. Some explanations of these phenomena are considered.

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