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Chandra High Energy Transmission Gratings Spectra of V3890 Sgr

Orio, M, Drake, JJ, Ness, J-U, Behar, E, Luna, GJM, Darnley, MJ, Gallagher, J, Gehrz, RD, Kuin, NPM, Mikolajewska, J, Ospina, N, Page, KL, Poggiani, R, Starrfield, S, Williams, R and Woodward, CE (2020) Chandra High Energy Transmission Gratings Spectra of V3890 Sgr. Astrophysical Journal. ISSN 0004-637X

2004.11263v2.pdf - Accepted Version

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The recurrent nova (RN) V3890 Sgr was observed during the 7th day after the onset of its most recent outburst, with the Chandra ACIS-S camera and High Energy Transmission Gratings (HETG). A rich emission line spectrum was detected, due to transitions of Fe-L and K-shell ions ranging from neon to iron. The measured absorbed flux is $\approx 10^{-10}$ erg cm$^{-2}$ s$^{-1}$ in the 1.4-15 Angstrom range (0.77-8.86 keV). The line profiles are asymmetric, blue-shifted and skewed towards the blue side, as if the ejecta moving towards us are less absorbed than the receding ones. The full width at half maximum of most emission lines is 1000-1200 km s$^{-1}$, with some extended blue wings. The spectrum is thermal and consistent with a plasma in collisional ionization equilibrium with column density 1.3 $\times 10^{22}$ cm$^{-2}$ and at least two components at temperatures of about 1 keV and 4 keV, possibly a forward and a reverse shock, or regions with differently mixed ejecta and red giant wind. The spectrum is remarkably similar to the symbiotic RNe V745 Sco and RS Oph, but we cannot distinguish whether the shocks occurred at a distance of few AU from the red giant, or near the giant's photosphere, in a high density medium containing only a small mass. The ratios of the flux in lines of aluminum, magnesium and neon relative to the flux in lines of silicon and iron probably indicate a carbon-oxygen white dwarf (CO WD).

Item Type: Article
Uncontrolled Keywords: astro-ph.HE; astro-ph.HE; astro-ph.SR
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society; IOP Publishing
Related URLs:
Date Deposited: 30 Apr 2020 10:36
Last Modified: 18 Aug 2022 10:30
DOI or ID number: 10.3847/1538-4357/ab8c4d
URI: https://researchonline.ljmu.ac.uk/id/eprint/12859
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