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Pulsations and long-term photometric variability of three candidates for protoplanetary nebulae

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Abstract

We present new photometric data and analyze long-term UBV observations of three candidates for protoplanetary nebulae—F supergiants with infrared excesses at high Galactic latitudes—IRAS 18095+2704, IRAS 19386+0155, and IRAS 19500-1709. All these stars exhibit quasi-periodic low-amplitude variations caused by pulsations against the background of long-term brightness trends. For IRAS 18095+2704=V887 Her, we have found a pulsation period of 109 days and revealed a linear brightness trend—the star brightens at constant (within the limits of the measurement errors) yearly mean color indices. The light curve of IRAS 19386+0155=V1648 Aql in 2000–2008 is represented by a wave with a fundamental period of 102 days whose modulation with a close period of 98 days leads to variations with a variable amplitude. V1648 Aql also shows a systematic rise in V brightness along with a reddening. IRAS 19500–1709=V5112 Sgr exhibits irregular pulsations with periods of 39 and 47 days. The long-term variability component of V5112 Sgr may indicate that the star is binary.

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Authors and Affiliations

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

    V. P. Arkhipova, N. P. Ikonnikova & G. V. Komissarova

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  1. V. P. Arkhipova
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  2. N. P. Ikonnikova
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  3. G. V. Komissarova
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Correspondence to N. P. Ikonnikova.

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Original Russian Text © V.P. Arkhipova, N.P. Ikonnikova, G.V. Komissarova, 2010, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2010, Vol. 36, No. 4, pp. 281–291.

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Arkhipova, V.P., Ikonnikova, N.P. & Komissarova, G.V. Pulsations and long-term photometric variability of three candidates for protoplanetary nebulae. Astron. Lett. 36, 269–279 (2010). https://doi.org/10.1134/S1063773710040055

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