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.
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