Spotted surface structure of the active giant PZ Mon
Autor: | Pakhomov, Yu. V., Antonyuk, K. A., Bondar', N. I., Pit', N. V., Reva, I. V., Kusakin, A. V. |
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Rok vydání: | 2017 |
Předmět: | |
Druh dokumentu: | Working Paper |
DOI: | 10.1134/S1063773717120040 |
Popis: | Based on our photometric observations in 2015-2016 and archival photometric data for the active red giant PZ Mon, we have found the main characteristics of the stellar surface: the unspotted surface temperature Teff=4730K, the spot temperature Tspot=3500K, and the relative spot area from 30 to 40%. The best agreement with the observations has been achieved in our three-spot model including a cool polar spot with a temperature of about 3500K as well as large and small warm spots with a temperature of about 4500K. The stable polar spot is responsible for the long-period brightness variations. Its presence is confirmed by an analysis of the TiO 7054$~\AA$ molecular band. The small-amplitude 34-day variability is attributable to the warm spots located on the side of the secondary component, which determine the relatively stable active longitude. Comment: 8 pages, 7 figures, accept in Astromonical Letters, 2018 |
Databáze: | arXiv |
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