The IR variability of FG Sagittae in 1985-1986

Details The IR variability of FG Sagittae in 1985-1986 The IR variability of FG Sagittae in 1985-1986

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pazh...13..891t&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 13, Oct. 1987, p. 891-893. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

7

Annual Variations, Infrared Spectra, Light Curve, Red Giant Stars, Spectral Energy Distribution, Stellar Temperature, Stellar Atmospheres, Stellar Luminosity

Scientific paper

From an analysis of 115-day variations of the IR brightness of FG Sge, it follows that these variations are mainly due to stellar photospheric temperature variations. From the energy distribution in the spectrum of FG Sge in the range 1.25 - 3.5 μm, the star is classified as G2 I and F5 I near the minimum and maximum of the 115-day variations respectively. The luminosity of FG Sge at the maximum of the 115-day cycle is almost by a factor of 2 larger than at the minimum. The radius variations do not exceed 10%. By the character of the IR brightness variations FG Sge is at present similar to the variables of the δ Cep of SRd types.

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