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Infrared Spectroscopy Of The Merger Candidate Kic 9832227

Title: Infrared Spectroscopy Of The Merger Candidate Kic 9832227.
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Name(s): Pavlenko, Ya, author
Evans, A., author
Banerjee, D. P. K., author
Southworth, J., author
Shahbandeh, M., author
Davis, S., author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2018-07-24
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Context. It has been predicted that the object KIC 9832227 - a contact binary star - will undergo a merger in 2022.2 +/- 0.7. We describe the near-infrared (NIR) spectrum of this object as an impetus to obtain pre-merger data. Aims. We aim to characterise (i) the nature of the individual components of the binary and (ii) the likely circumbinary environment, so that the merger - if and when it occurs - can be interpreted in an informed manner. Methods. We use infrared (IR) spectroscopy in the wavelength range 0.7-2.5 mu m, to which we fit model atmospheres to represent the individual stars. We use the binary ephemeris to determine the orbital phase at the time of observation. Results. We find that the IR spectrum is best fitted by a single component with effective temperature 5920 K, log [g] = 4.1, and solar metallicity, consistent with the fact that the system was observed at conjunction. Conclusions. The strength of the IR H lines is consistent with a high value of log g, and the strength of the Can triplet indicates the presence of a chromosphere, as might be expected from rapid stellar rotation. The He I absorption we observe likely arises in He excited by coronal activity in a circumstellar envelope, suggesting that the weakness of the Can triplet is also likely chromospheric in origin.
Identifier: FSU_libsubv1_wos_000439936700009 (IID), 10.1051/0004-6361/201832717 (DOI)
Keywords: spectra, absorption, circumstellar matter, binaries: close, binaries: eclipsing, infrared: stars, line, m-dwarfs, red giants, stars: individual: KIC 9832227, v1309 sco
Publication Note: The publisher’s version of record is available at https://doi.org/10.1051/0004-6361/201832717
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000439936700009
Owner Institution: FSU
Is Part Of: Astronomy & Astrophysics.
1432-0746
Issue: vol. 615

Choose the citation style.
Pavlenko, Y., Evans, A., Banerjee, D. P. K., Southworth, J., Shahbandeh, M., & Davis, S. (2018). Infrared Spectroscopy Of The Merger Candidate Kic 9832227. Astronomy & Astrophysics. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000439936700009