Results of infrared photometry and a model for the dust envelope of the protoplanetary nebula candidate V1027 Cyg

Astronomy and Astrophysics – Astronomy

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97.10.Fy, 97.20.Rp, 95.85.Hp, 95.85.Jq

Scientific paper

Results of JHKLM photometry for the protoplanetary nebula candidate V1027 Cyg obtained in 1991-2008 are reported. In all bands, the brightness variations did not exceed 0.2 m . Estimated linear trends demonstrate no significant changes in the mean brightness and color indices of the object, with the possible exception of the L-M color index, which showed a small decrease. A search for possible periodicities in the brightness variations yielded the most probable period of 237d. A model for a spherically-symmetric dust shell has been calculated based on the photometric results supplemented with data on the mid- and far-infrared fluxes. The estimated mass-loss rate of the star is 1.3 × 10-5 M &sun;/year.

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