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1977•Monthly Notices of the Royal Astronomical SocietyOpen access

The RCB variables - VII. The infrared variability of RY Sgr

M. W. Feast, R. M. Catchpole, T. Lloyd Evans, B. S. C. Robertson, J. F. Dean, R. A. Bywater

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Abstract

J, H, K, L (1.2–3.5µ) and B, V,Rc,Ic photometry of the pulsating RCB star RYSgr in 1975 are reported. A few radial velocities are also included. The infrared excess varies in the pulsation period of the visible star. This indicates that the infrared source derives its energy from this star, (presumably because it is a dust shell around the star). There is no need to postulate the presence of an infrared companion star. The 11 00-day periodicity in the infrared. excess of R CrB itself may be due to a natural pulsation of the circumstellar dust shell.

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J, H, K, L (1.2–3.5µ) and B, V,Rc,Ic photometry of the pulsating RCB star RYSgr in 1975 are reported. A few radial velocities are also included. The infrared excess varies in the pulsation period of the visible star. This indicates that the infrared source derives its energy from this star, (presumably because it is a dust shell around the star). There is no need to postulate the presence of an infrared companion star. The 11 00-day periodicity in the infrared. excess of R CrB itself may be due to a natural pulsation of the circumstellar dust shell.

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Available abstract

J, H, K, L (1.2–3.5µ) and B, V,Rc,Ic photometry of the pulsating RCB star RYSgr in 1975 are reported. A few radial velocities are also included. The infrared excess varies in the pulsation period of the visible star. This indicates that the infrared source derives its energy from this star, (presumably because it is a dust shell around the star). There is no need to postulate the presence of an infrared companion star. The 11 00-day periodicity in the infrared. excess of R CrB itself may be due to a natural pulsation of the circumstellar dust shell.

Key concepts: Physics, Infrared excess, Infrared, Astrophysics, Photometry (optics), Circumstellar dust, Astronomy, Star (game theory)

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