Evans, A ORCID: https://orcid.org/0000-0002-3142-8953, 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).

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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
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

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