Advertisement

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
Article
  • 14 Downloads

Abstract

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.

Keywords

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

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    S. H. P. Alencar, G. Basri, L. Hartmann, and N. Calvet, Astron. Astrophys. 440, 595 (2005).ADSCrossRefGoogle Scholar
  2. 2.
    J. Bouvier, A. Chelli, S. Allain, L. Carrasco, R. Costero, I. Cruz-Gonzalez, C. Dougados, M. Fernández, et al., Astron. Astrophys. 349, 619 (1999).ADSGoogle Scholar
  3. 3.
    J. Bouvier, K. N. Grankin, and S. H. P. Alencar, Astron. Astrophys. 409, 169 (2003).ADSCrossRefGoogle Scholar
  4. 4.
    A. G. A. Brown, A. Vallenari, T. Prusti, J. H. J. de Bruijne, C. Babusiaux, and C. A. L. Bailer-Jones (Gaia Collab.), arXiv:1804.09365 (2018).Google Scholar
  5. 5.
    M. Fang, R. van Boekel, W. Wang, A. Carmona, A. Sicilia-Aguilar, and Th. Henning, Astron. Astrophys. 504, 461 (2009).ADSCrossRefGoogle Scholar
  6. 6.
    U. Finkenzeller and R. Mundt, Astron. Astrophys. Suppl. Ser. 55, 109 (1984).ADSGoogle Scholar
  7. 7.
    J. F. Gameiro, D. F.M. Folha, and P. P. Petrov, Astron. Astrophys. 445, 323 (2006).ADSCrossRefGoogle Scholar
  8. 8.
    V. P. Grinin, N. N. Kiselev, N. Kh. Minikhulov, and G. P. Chernova, Sov. Astron. Lett. 14, 219 (1988).ADSGoogle Scholar
  9. 9.
    B. Gustafsson, B. Edwardsson, K. Eriksson, U. G. Jorgensen, A. Nordlund, and B. Plez, Astron. Astrophys. 486, 951 (2008).ADSCrossRefGoogle Scholar
  10. 10.
    W. Herbst, D. K. Herbst, E. J. Grossman, and D. Weinstein, Astron. J. 108, 1906 (1994).ADSCrossRefGoogle Scholar
  11. 11.
    J. King, Astron. J. 105, 1087 (1993).ADSCrossRefGoogle Scholar
  12. 12.
    I. S. Potravnov, V. P. Grinin, and D. E. Mkrtichian, ASP Conf. 508, 335 (2017).ADSGoogle Scholar
  13. 13.
    B. Reiphurt, A. Pedrosa, and M. T.V. T. Lago, Astron. Astrophys. Suppl. Ser. 120, 129 (1996).ADSGoogle Scholar
  14. 14.
    M. M. Romanova, G. V. Ustyugova, A. V. Koldoba, and R. V. E. Lovelace, Astrophys. J. 610, 920 (2004).ADSCrossRefGoogle Scholar
  15. 15.
    L. Siess, E. Dufor, and M. Forestini, Astron. Astrophys. 358, 593 (2000).ADSGoogle Scholar
  16. 16.
    M. Uemura, T. Kato, R. Ishoka, S. Yoshida, K.-I. Kadota, N. Ohkura, A. Henden, O. Pejcha, et al., Publ. Astron. Soc. Jpn. 56, S183 (2004).Google Scholar

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

Personalised recommendations