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PV CEP and V350 CEP: Stars on the Way between FUors and EXors

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Based on new observations during 2015-2020 and published data, the unusual eruptive variables PV Cep and V350 Cep are examined. It is shown that PV Cep underwent a regular outburst followed by a drop in brightness that lasted overall from 2011 to 2019 and is still in a deep minimum. The outburst was accompanied by substantial changes in the intensity and profiles of a number of lines, including Hα, [SII], and [OI]. The forbidden lines generally have negative radial velocities and can be divided into four components, with variable velocities and relative intensities. V350 Cep essentially is at a maximum brightness level over the entire time and its spectrum is practically unaltered. The available data suggest that the pronounced P Cyg profile of the Hα line in the spectrum of V350 Cep appeared several years after the luminosity rise, in 1986. The luminosities of the stars in the current state are estimated to be 20 L⨀ and 3.3 L⨀, respectively. It is concluded that both stars may srepresent a so-called intermediate objects between the FUor and EXor classes.

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Authors and Affiliations

  1. V. A. Ambartsumian Byurakan Astrophysical Observatory, National Academy of Sciences of Armenia, Yerevan, Armenia

    H. R. Andreasyan, T. Yu. Magakian & T. A. Movsessian

  2. Special Astrophysical Observatory (SAO), Russian Academy of Sciences, Nizhniy Arkhyz, Russia

    A. V. Moiseev

Authors
  1. H. R. Andreasyan
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  2. T. Yu. Magakian
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  3. T. A. Movsessian
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  4. A. V. Moiseev
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Correspondence to H. R. Andreasyan.

Additional information

Translated from Astrofizika, Vol. 64, No. 2, pp. 213-231, May 2021.

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Andreasyan, H.R., Magakian, T.Y., Movsessian, T.A. et al. PV CEP and V350 CEP: Stars on the Way between FUors and EXors. Astrophysics 64, 187–202 (2021). https://doi.org/10.1007/s10511-021-09680-5

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  • DOI: https://doi.org/10.1007/s10511-021-09680-5

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