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Nonstationarity of hot post-AGB objects: Variations of the brightness and spectrum of IRAS 01005+7910, IRAS 22023+5249, and IRAS 22495+5134

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Abstract

UBV photometry for two hot protoplanetary nebula candidates, early B supergiants with emission lines in the spectrum, IRAS 01005+7910 and IRAS 22023+5249, as well as for IRAS 22495+5134, the central star of the young compact planetary nebula M 2–54, is presented for the first time. Fast irregular brightness variations of the stars with maximum amplitudes up to

and color-brightness correlations have been found: the B - V colors tend to become redder with increasing brightness, while U - B more likely decrease with brightening. The color excesses E(B - V) have been determined. The equivalent widths and absolute intensities of emission lines have been derived from low-resolution spectroscopy. Spectral variability has been revealed in all objects. The parameters of the gaseous nebula have been calculated for M 2–54: N e ∼ 104 cm−3and T e = 7700 ± 200 K. A joint analysis of the photometric and spectroscopic data suggests that stellar wind variations can be one of the causes of the stellar variability. The luminosities and distances of all three objects have been estimated.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia

    V. P. Arkhipova, M. A. Burlak, V. F. Esipov, N. P. Ikonnikova & G. V. Komissarova

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  1. V. P. Arkhipova
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  2. M. A. Burlak
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  3. V. F. Esipov
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  4. N. P. Ikonnikova
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  5. G. V. Komissarova
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Correspondence to N. P. Ikonnikova.

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Original Russian Text © V.P. Arkhipova, M.A. Burlak, V.F. Esipov, N.P. Ikonnikova, G.V. Komissarova, 2013, published in Pis’ma v Astronomicheskiı Zhurnal, 2013, Vol. 39, No. 9, pp. 695–709.

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Arkhipova, V.P., Burlak, M.A., Esipov, V.F. et al. Nonstationarity of hot post-AGB objects: Variations of the brightness and spectrum of IRAS 01005+7910, IRAS 22023+5249, and IRAS 22495+5134. Astron. Lett. 39, 619–633 (2013). https://doi.org/10.1134/S1063773713090016

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  • DOI: https://doi.org/10.1134/S1063773713090016

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