Astronomy Letters

, Volume 44, Issue 12, pp 798–802 | Cite as

Results of Photometric and Spectroscopic Observations of the Young Variable Star V730 Cep

  • V. P. GrininEmail author
  • K. A. Antonyuk
  • I. S. Potravnov
  • D. Mkrtichian


We present the results of our photometric (V RI) and spectroscopic observations of the young variable star V730 Cep (MisV1147) classified by Uemura et al. (2004) as a Herbig Be star. Our photometry confirms the conclusion of the above authors that this star has a complex pattern of variability including periodic or quasi-periodic brightness variations with a period of about 14 days and deep Algol-like minima typical for UX Ori stars. Our spectroscopy shows that the classification of V730 Cep as a Herbig Be star is wrong. Actually, this star has a much lower temperature and belongs to the family of T Tauri stars. This allows us to explain the nature of the unusual photometric activity of V730 Cep based on a combination of two well-known models of variable circumstellar extinction applied to young stars: AA Tau- and UX Oritype variability. It follows from our observations that the color tracks on the V −(V −I) color–magnitude diagram for these models slightly differ: the AA Tau-type variability of circumstellar extinction is caused by larger grains than the UX Ori-type variability. Such a difference can be due to an increase in the characteristic sizes of circumstellar dust as the star is approached and has a simple explanation: small dust grains evaporate faster than large ones.


T Tauri and Herbig Be stars optical photometry and spectroscopy activity mechanisms 


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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • V. P. Grinin
    • 1
    Email author
  • K. A. Antonyuk
    • 2
  • I. S. Potravnov
    • 1
  • D. Mkrtichian
    • 3
  1. 1.Pulkovo Astronomical ObservatoryRussian Academy of SciencesSt. PetersburgRussia
  2. 2.Crimean Astrophysical ObservatoryRussian Academy of SciencesNauchnyiRussia
  3. 3.National Astronomical Research Institute of Thailand (NARIT)Chiang MaiThailand

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