2022ApJ...932...36K -
Astrophys. J., 932, 36-36 (2022/June-2)
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. and AGISHEV A.T.
Abstract (from CDS):
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 (Teff = 8500 ± 500 K, \mathrm{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.
Abstract Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
A stars - Binary stars - Spectroscopic binary stars - Be stars - Emission line stars
Simbad objects:
12
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2022ApJ...932...36K and select 'bookmark this link' or equivalent in the popup menu