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The recurrent nova V3890 Sgr: a near-infrared and optical study of the red giant component and its environment

Kaminsky, B; Evans, A; Pavlenko, Ya V; Woodward, C E; Banerjee, D P K; Gehrz, R D; Walter, F; Starrfield, S; Ilyin, I; Strassmeier, K G; Wagner, R M

The recurrent nova V3890 Sgr: a near-infrared and optical study of the red giant component and its environment Thumbnail


Authors

B Kaminsky

A Evans

Ya V Pavlenko

C E Woodward

D P K Banerjee

R D Gehrz

F Walter

S Starrfield

I Ilyin

K G Strassmeier

R M Wagner



Abstract

We present an analysis of the red giant component of the recurrent nova V3890 Sgr, using data obtained before and after its 2019 eruption. Its effective temperature is Teff = 3050±200 K for log g = 0.7, although there are modest changes in Teff. There is an overabundance of both carbon (0.20 ± 0.05 dex) and sodium (1.0 ± 0.3 dex) relative to their solar values, possibly the result of ejecta from the 1990 nova eruption being entrained into the red giant photosphere. We find 12C/13C = 25 ± 2, a value similar to that found in red giants in other recurrent novae. The interpretation of the quiescent spectrum in the 5–38 µm region requires the presence of photospheric SiO absorption and cool (~ 400 K) dust in the red giant environment. The spectrum in the region of the Na i D lines is complex, and includes at least six interstellar components, together with likely evidence for interaction between ejecta from the 2019 eruption and material accumulated in the plane of the binary. Three recurrent novae with giant secondaries have been shown to have environments with different dust content, but photospheres with similar 12C/13C ratios. The SiO fundamental bands most likely have a photospheric origin in the all three stars.

Journal Article Type Article
Acceptance Date Jul 28, 2022
Online Publication Date Sep 3, 2022
Publication Date Nov 12, 2022
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 517
Issue 4
Pages 6064-6076
DOI https://doi.org/10.1093/mnras/stac2199
Keywords Space and Planetary Science, Astronomy and Astrophysics
Publisher URL https://doi.org/10.1093/mnras/stac2199

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