Toward Understanding the B[e] Phenomenon. VIII. Nature and Variability of IRAS 07080+0605
Khokhlov S.A. Miroshnichenko A.S. Zharikov S.V. Grankin K.N. Zakhozhay O.V. Manset N. Arkharov A.A. Efimova N. Klimanov S. Larionov V.M. Khokhlov A.A. Kusakin A.V. Omarov C.T. Kokumbaeva R.I. Reva I.V. Agishev A.T.
1 June 2022Institute of Physics
Astrophysical Journal
2022#932Issue 1
We report the results of spectroscopic and photometric observations of the emission-line object IRAS 07080+0605 carried out in 2004-2021. We found that the object is significantly underluminous for its spectroscopic properties (T eff = 8500 ± 500 K, log g = 2.0 ± 0.5), if a strong visual attenuation by a factor of ∼43 found through the spectral energy distribution modeling is not taken into account. Visual brightness variations with a stable period of 190 days but a variable amplitude of ∼0.2 mag were found in the ASAS SN data and attributed to variable circumstellar extinction in the dusty disk. We also found that the observed behavior of IRAS 07080+0605 is similar to that of the protoplanetary nebula Red Rectangle. The dusty disk of IRAS 07080+0605 shows the presence of carbonaceous particles (∼10%-20% of the total dust content) and polycyclic aromatic hydrocarbon emission bands. However, IRAS 07080+0605 shows no obvious signs of the refractory element depletion, which is common in post-asymptotic giant branch (AGB) dusty binaries, or of a visual nebula. Absorption-line positions vary with an amplitude of ∼25 km s-1, suggesting the presence of a secondary component. Spectroscopic monitoring on a timescale from days to months is needed to search for regular variations. We conclude that IRAS 07080+0605 is most likely a binary system with an A-type component on its way toward the post-AGB evolutionary stage, as binarity is capable of explaining most of the observed features.
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Al-Farabi Kazakh National University, Al-Farabi Ave., 71, Almaty, 050040, Kazakhstan
Department of Physics and Astronomy, University of North Carolina at Greensboro, P.O. Box 26170, Greensboro, 27402-6170, NC, United States
Fesenkov Astrophysical Institute, Observatory 23, Almaty, 050020, Kazakhstan
Main (Pulkovo) Astronomical Observatory, The Russian Academy of Sciences, Pulkovskoye chosse 65-1, Saint-Petersburg, 196140, Russian Federation
Universidad Nacional Autónoma de México, Instituto de Astronomía, AP 106, BC, 22800, Ensenada, Mexico
Crimean Astrophysical Observatory, Scientific Research Institute, Nauchny, 298409, Russian Federation
Max-Planck-Institut für Astronomie, Königstuhl 17, Heidelberg, D-69117, Germany
CFHT Corporation, Kamuela, 96743, HI, United States
V.V. Sobolev Astronomical Institute, The St.-Petersburg State University, St.-Petersburg, 198504, Russian Federation
Al-Farabi Kazakh National University
Department of Physics and Astronomy
Fesenkov Astrophysical Institute
Main (Pulkovo) Astronomical Observatory
Universidad Nacional Autónoma de México
Crimean Astrophysical Observatory
Max-Planck-Institut für Astronomie
CFHT Corporation
V.V. Sobolev Astronomical Institute
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