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Abstract:

Symbiotic stars often contain white dwarfs with quasi-steady shell burning on their surfaces. However, in most symbiotics, the origin of this burning is unclear. In symbiotic slow novae, however, it is linked to a past thermonuclear runaway. In 2015 June, the symbiotic slow nova AG Peg was seen in only its second optical outburst since 1850. This recent outburst was of much shorter duration and lower amplitude than the earlier eruption, and it contained multiple peaks - like outbursts in classical symbiotic stars such as Z And. We report Swift X-ray and UV observations of AG Peg made between 2015 June and 2016 January. The X-ray flux was markedly variable on a time-scale of days, particularly during four days near optical maximum, when the X-rays became bright and soft. This strong X-ray variability continued for another month, after which the X-rays hardened as the optical flux declined. The UV flux was high throughout the outburst, consistent with quasi-steady shell burning on the white dwarf. Given that accretion discs around white dwarfs with shell burning do not generally produce detectable X-rays (due to Compton-cooling of the boundary layer), the X-rays probably originated via shocks in the ejecta. As the X-ray photoelectric absorption did not vary significantly, the X-ray variability may directly link to the properties of the shocked material. AG Peg's transition from a slow symbiotic nova (which drove the 1850 outburst) to a classical symbiotic star suggests that shell burning in at least some symbiotic stars is residual burning from prior novae. © 2016 The Authors.

Registro:

Documento: Artículo
Título:Swift observations of the 2015 outburst of AG Peg - from slow nova to classical symbiotic outburst
Autor:Ramsay, G.; Sokoloski, J.L.; Luna, G.J.M.; Nuñez, N.E.
Filiación:Armagh Observatory, College Hill, Armagh, BT61 9DG, United Kingdom
Columbia Astrophysics Lab, MC 5247 Columbia University, 550 W120th St., 1027 Pupin HallNY 10027, United States
Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA), Av. Inte. Güiraldes 2620, Buenos Aires, C1428ZAA, Argentina
Instituto de Ciencias Astronóomicas de la Tierra y el Espacio (ICATE-UNSJ), Av. Espanã (sur) 1512, San Juan, 5400, Argentina
Palabras clave:Accretion, accretion discs; Binaries: symbiotic; Instabilities; Stars: individual: AG Peg
Año:2016
Volumen:461
Número:4
Página de inicio:3599
Página de fin:3606
DOI: http://dx.doi.org/10.1093/mnras/stw1546
Título revista:Monthly Notices of the Royal Astronomical Society
Título revista abreviado:Mon. Not. R. Astron. Soc.
ISSN:00358711
CODEN:MNRAA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v461_n4_p3599_Ramsay

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Citas:

---------- APA ----------
Ramsay, G., Sokoloski, J.L., Luna, G.J.M. & Nuñez, N.E. (2016) . Swift observations of the 2015 outburst of AG Peg - from slow nova to classical symbiotic outburst. Monthly Notices of the Royal Astronomical Society, 461(4), 3599-3606.
http://dx.doi.org/10.1093/mnras/stw1546
---------- CHICAGO ----------
Ramsay, G., Sokoloski, J.L., Luna, G.J.M., Nuñez, N.E. "Swift observations of the 2015 outburst of AG Peg - from slow nova to classical symbiotic outburst" . Monthly Notices of the Royal Astronomical Society 461, no. 4 (2016) : 3599-3606.
http://dx.doi.org/10.1093/mnras/stw1546
---------- MLA ----------
Ramsay, G., Sokoloski, J.L., Luna, G.J.M., Nuñez, N.E. "Swift observations of the 2015 outburst of AG Peg - from slow nova to classical symbiotic outburst" . Monthly Notices of the Royal Astronomical Society, vol. 461, no. 4, 2016, pp. 3599-3606.
http://dx.doi.org/10.1093/mnras/stw1546
---------- VANCOUVER ----------
Ramsay, G., Sokoloski, J.L., Luna, G.J.M., Nuñez, N.E. Swift observations of the 2015 outburst of AG Peg - from slow nova to classical symbiotic outburst. Mon. Not. R. Astron. Soc. 2016;461(4):3599-3606.
http://dx.doi.org/10.1093/mnras/stw1546