Mistry, D and Steele, IA (2021) Spectroscopy of the 2015 Outburst of AG Pegasi. Research Notes of the AAS, 5 (3).

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Abstract

Between 2015 September and 2016 January, we obtained 18 spectra of the 2015 classical outburst of AG Pegasi—a symbiotic star consisting of a white dwarf (WD), red giant, and surrounding nebula. Modelling the flux contributions of these components reveals that nebular emission, from the reprocessing of high energy WD photons, dominates the 3200–6300 Å range. Nebular emission rises and falls in line with changes seen in the WD, whose properties have been derived using H<jats:italic>β</jats:italic> and He <jats:sc>ii</jats:sc> (4686 A) line flux, and emission measure calculations. WD parameters follow changes seen in visual band light curves. During the second peak of the outburst, WD temperatures reach 166,000 ± 6000 K, with a luminosity and radius of 14,000 ± 2000 <jats:italic>L</jats:italic>
<jats:sub>⊙</jats:sub> and 0.149 ± 0.014 <jats:italic>R</jats:italic>
<jats:sub>⊙</jats:sub> respectively. These features are consistent with an expansion of the WD pseudo-photosphere due to an accretion rate exceeding that required for stable hydrogen burning.</jats:p>

Item Type:	Article
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	American Astronomical Society
SWORD Depositor:	A Symplectic
Date Deposited:	08 Nov 2022 13:18
Last Modified:	08 Nov 2022 13:18
DOI or ID number:	10.3847/2515-5172/abeefd
URI:	https://researchonline.ljmu.ac.uk/id/eprint/18067

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