OBSERVATIONS OF LOW-AMPLITUDE BRIGHTNESS OSCILLATIONS IN THE UNUSUAL ECLIPSING SYSTEM V718 PER (HMW 15, H 187)

Автор(и)

  • O. Barsunova Central Astronomical Observatory (Pulkovo), Russian Federation
  • V. Grinin Central Astronomical Observatory (Pulkovo), Russian Federation
  • A. Arkharov Central Astronomical Observatory (Pulkovo), Russian Federation
  • S. Sergeev Crimean Astrophysical Observatory, Nauchny, Crimea, Ukraine
  • S. Shugarov Sternberg Astronomical Institute, Moscow State University, Moscow, Russian Federation

DOI:

https://doi.org/10.18524/1810-4215.2010.23.84050

Ключові слова:

young eclipsing systems, photometry, protoplanetary disks, stars, individual, V718 Per

Анотація

The unusual young star V718 Per is known its prolonged eclipses with a period of 4.7 years. In additional we have discovered that for the last observational seasons (2008-2010) the low-amplitude oscillations are presented at the star's light curve and their period is approximately a factor of 8 shorter that the main one. In contrast to the large-scale eclipses accompanied by the star's reddening, the low-amplitude oscillations are neutral in character. So bimodal behavior can be the result of the division a circumstellar disk into two parts: an inner, dense region, and an outer, less dense disk, with a large cavity between them. Such structures emerge in the presence of a fairly massive perturbing body (or bodies) in the disk. In this case, density waves rotating with different angular velocities can be formed in each of
these parts. Therefore, when such a system is observed
nearly edge-on, two oscillation modes with different  periods can be present in the extinction variations. We suggest that such a situation takes place in the case of V718 Per. In that case the perturbing body (or bodies) can be either a giant planets or a brown dwarfs, because of this star exhibits no signatures of spectroscopic binarity.

 

Посилання

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Опубліковано

2010-11-22

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