... (HD 202904)

Based on observations obtained at Haute Provence Observatory and Pic du Midi Observatory (France), Kitt Peak National Observatory (USA), and Okayama Astrophysical Observatory (Japan).

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...1,2,

Current Affiliation: Institute for astronomy, KU Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium.

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... (AAVSO

We acknowledge with thanks the variable star observations from the AAVSO International Database contributed by observers worldwide and used in this research.

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... IRAF

IRAF is distributed by the National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under cooperative agreement with the National Science Foundation.

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