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Cyclic phenomena in the circumstellar envelope of the A0e/B9e Herbig star AB Aur

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An analysis of spectra of the well known Herbig Ae/Be star AB Aur obtained with a high resolution Coude spectrograph (R~20000-25000) installed on the 2.6-m Shejn telescope at the Crimean Astrophysical Observatory (Ukraine) and a medium resolution echelle spectrometer (R~14000) on the 2-m Zeiss telescope at the Shemakha Astrophysical Observatory of the National Academy of Sciences of Azerbaijan yielded an unexpected result. It turns out the the variations in the equivalent widths EW of the HeI 5876 and D NaI emission lines have an inverse correlation (r=-0.67±0.14 and -0.73±0.10 according to the data from the CrAO and the ShAO, respectively), while the correlation is direct for the Hα and HeI 5876 lines (r=+0.68±0.14 and +0.59±0.14 according to the data from the CrAO and the ShAO, respectively). The Lafler-Kinman method gives a period P=123.7 days for the variation in the EW of these lines. On phase diagrams plotted for this period, the variations in the EW are sinusoidal, with the variations in EW(HeI) and EW(DNaI) in counterphase, while EW(HeI) and EW(Hα) are in phase. A possible interpretation of this phenomenon is examined. The need for new spectral observations of AB Aur in order to confirm the observed effects on a larger statistical sample is emphasized.

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Authors and Affiliations

  1. Main (Pulkovo) Astronomical Observatory, Russian Academy of Sciences, St. Petersburg, Russia

    M. A. Pogodin, N. G. Beskrovnaya, N. R. Ikhsanov & R. V. Yudin

  2. Crimean Astrophysical Observatory, Crimean, Ukraine

    O. V. Kozlova

  3. Shemakha Astrophysical Observatory, National Academy of Sciences of Azerbaijan, Shemakha, Azerbaijan

    N. Z. Ismailov & O. V. Khalilov

Authors
  1. M. A. Pogodin
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  2. O. V. Kozlova
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  3. N. G. Beskrovnaya
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  4. N. R. Ikhsanov
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  5. N. Z. Ismailov
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  6. O. V. Khalilov
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  7. R. V. Yudin
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Correspondence to M. A. Pogodin.

Additional information

Translated from Astrofizika, Vol. 55, No. 4, pp. 527-542 (November 2012).

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Pogodin, M.A., Kozlova, O.V., Beskrovnaya, N.G. et al. Cyclic phenomena in the circumstellar envelope of the A0e/B9e Herbig star AB Aur. Astrophysics 55, 480–493 (2012). https://doi.org/10.1007/s10511-012-9254-5

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  • DOI: https://doi.org/10.1007/s10511-012-9254-5

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