The path to Z And-type outbursts: The case of V426 Sagittae (HBHA 1704-05)

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dc.contributor.authorSkopal, A.
dc.contributor.authorShugarov, S. Yu.
dc.contributor.authorMunari, U.
dc.contributor.authorMasetti, N.
dc.contributor.authorMarchesini, E.
dc.contributor.authorKomžík, R. M.
dc.contributor.authorKundra, E.
dc.contributor.authorShagatova, N.
dc.contributor.authorTarasova, T. N.
dc.contributor.authorBuil, C.
dc.contributor.authorBoussin, C.
dc.contributor.authorShenavrin, V. I.
dc.contributor.authorHambsch, F. J.
dc.contributor.authorDallaporta, S.
dc.contributor.authorFrigo, A.
dc.contributor.authorGarde, O.
dc.contributor.authorZubareva, A.
dc.contributor.authorDubovský, P. A.
dc.contributor.authorKroll, P.
dc.date.accessioned2023-12-04T14:11:11Z
dc.date.available2023-12-04T14:11:11Z
dc.date.issued2020-04-01
dc.descriptionIndexación (Scopus)es
dc.description.abstractContext. The star V426 Sge (HBHA 1704-05), originally classified as an emission-line object and a semi-regular variable, brightened at the beginning of August 2018, showing signatures of a symbiotic star outburst. Aims. We aim to confirm the nature of V426 Sge as a classical symbiotic star, determine the photometric ephemeris of the light minima, and suggest the path from its 1968 symbiotic nova outburst to the following 2018 Z And-type outburst. Methods. We re-constructed an historical light curve (LC) of V426 Sge from approximately the year 1900, and used original low- (R ∼ 500-1500; 330-880 nm) and high-resolution (R ∼ 11 000-34 000; 360-760 nm) spectroscopy complemented with Swift-XRT and UVOT, optical UBVRCIC and near-infrared JHKL photometry obtained during the 2018 outburst and the following quiescence. Results. The historical LC reveals no symbiotic-like activity from ∼1900 to 1967. In 1968, V426 Sge experienced a symbiotic nova outburst that ceased around 1990. From approximately 1972, a wave-like orbitally related variation with a period of 493.4 ± 0.7 days developed in the LC. This was interrupted by a Z And-type outburst from the beginning of August 2018 to the middle of February 2019. At the maximum of the 2018 outburst, the burning white dwarf (WD) increased its temperature to ? 2 × 105 K, generated a luminosity of ∼7 × 1037 (d/3.3 kpc)2 erg s-1 and blew a wind at the rate of ∼3 × 10-6 M yr-1. Our spectral energy distribution models from the current quiescent phase reveal that the donor is a normal M4-5 III giant characterised with Teff ∼ 3400 K, RG ∼ 106 (d/3.3 kpc) R and LG ∼ 1350 (d/3.3 kpc)2 L and the accretor is a low-mass ∼0.5 M WD. Conclusions. During the transition from the symbiotic nova outburst to the quiescent phase, a pronounced sinusoidal variation along the orbit develops in the LC of most symbiotic novae. The following eventual outburst is of Z And-type, when the accretion by the WD temporarily exceeds the upper limit of the stable burning. At this point the system becomes a classical symbiotic star.es
dc.identifier.citationAstronomy and Astrophysics Volume 636 1 April 2020 Article number A77es
dc.identifier.doi10.1051/0004-6361/201937199en
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/54365
dc.language.isoenes
dc.publisherEDP Scienceses
dc.rights.licenseCC BY 4.0 DEED Atribución 4.0 Internacionalen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.esen
dc.subjectBinaries: symbiotices
dc.subjectCataclysmic variableses
dc.subjectNovaees
dc.subjectStars: individual: V426 Sagittae (HBHA 1704-05)es
dc.titleThe path to Z And-type outbursts: The case of V426 Sagittae (HBHA 1704-05)es
dc.typeArtículoes
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