EVIDENCES OF SURFACE DIFFERENTIAL ROTATION ON THE RED DWARF PZ MON

Автор(и)

  • N. I. Bondar' Crimean Astrophysical Observatory, Ukraine, Україна
  • V. V. Prokof'eva Crimean Astrophysical Observatory, Ukraine, Україна

DOI:

https://doi.org/10.18524/1810-4215.2007.20.93637

Ключові слова:

Stars, red dwarfs, starspots, individual, PZ Mon.

Анотація

Photometric behavior of the active red dwarf PZ Mori (K2e) is studied using UBVRI obser­vations obtained with 1.25 m telescope of the SRI "Crimean Astrophysical Observatory" in 1992-2004 and V-data from the ASAS catalogue obtained in 2000­2006. Frequency analysis of the full V-data and colors has shown the existence of close periods – 2429d and 2500 d, respectively. Supposing that the star's surface is covered by spots a long-term variability can be ex­plained as changes of stellar activity during 6.5 years. After subtraction of slow periodicity some periods in the range of 15 d  - 56 d with amplitudes more than 4a were found. Period P = 34d found as at the whole in­terval of observations as at the short selected intervals is likely close to the rotation period of the star. Steady-phase of this period indicates the existence of an active longitude where spots are generated.

 

Посилання

Alekseev I.Yu., Bondar’ N.I.: 2006, Astron. Astrophys. Transac., 25 (2-3), 247.

Бондарь Н.И., Прокофьева В.В.: 2005, Труды ГАИШ, 78, 64.

Бондарь Н.И., Прокофьева В.В.: 2006, Астрономический журнал, 83, 1.

Donahue R.A., Saar S.H., Ваliunas S.L.: 1996, Astrophys. J., 466, 384.

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2017-03-14

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