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Evans, A, Woodward, C, Pavlenko, Y, Wagner, RM, Ilyin, I, Strassmeier, KG, Starrfield, S and Munari, U (2020) Lithium in T Coronae Borealis. Astronomical Journal, 159 (5). ISSN 0004-6256
Woodward_2020_AJ_inpress.pdf - Accepted Version
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Abstract
T Coronae Borealis is a recurrent, symbiotic nova system currently in quiescence between its periodic ≈80 yr cycle of eruptions. Observations during inter-outburst epochs provide an opportunity to study properties of the accretion disk and the M red giant. Here we present new irradiated (blackbody veiling) models, incorporating modern molecular opacities and line lists, of spectra derived from high-resolution (22,000 lesssim R lesssim 120,000) optical echelle observations obtained at two epochs, one prior to and one post the 2015 rebrightening event at similar spectroscopic system phase. We find a lithium abundance in the secondary at both epochs to be comparable. The non-irradiated (classical) model atmospheres yield a lithium abundance, A(Li) = 1.3 ± 0.1. The irradiated model (veiled) atmospheres, which are likely a better representation of the system in which the white dwarf and accretion disk illuminate the red giant, give A(Li) = 2.4 ± 0.1.
Item Type: | Article |
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Additional Information: | The final version of this accepted manuscript is available from the publisher at http://iopscience.iop.org/1538-3881 |
Uncontrolled Keywords: | Novae; Recurrent novae; Astrochemistry; Chemical abundances; High resolution spectroscopy |
Subjects: | Q Science > QB Astronomy Q Science > QB Astronomy > QB460 Astrophysics |
Divisions: | Faculty of Natural Sciences > School of Physical and Geographical Sciences |
Depositing User: | Symplectic |
Date Deposited: | 03 Apr 2020 12:04 |
Last Modified: | 09 Jun 2020 14:42 |
URI: | https://eprints.keele.ac.uk/id/eprint/7860 |