J/A+A/639/L10ivo://CDS.VizieR/J/A+A/639/L10doi:10.26093/cds/vizier.36399010CDSMunari U.Moretti S.Maitan A.2020-09-01T11:11:34Z2020-07-23T07:18:37ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frnovaecataclysmic-variable-starsinfrared-photometryvisible-astronomyphotometryNova Per 2018 (= V392 Per) halted the decline from maximum when it was 2mag brighter than quiescence and since 2019 has been stable at such a plateau. The ejecta have already fully diluted into the interstellar space. We obtained BVRIgrizY photometry and optical spectroscopy of V392 Per during the plateau phase and compared it with equivalent data gathered prior to the nova outburst. We find the companion star (CS) to be a G9 IV/III and the orbital period to be 3.4118 days, making V392 Per the longest known period for a classical nova. The location of V392 Per on the theoretical isochrones is intermediate between that of classical novae and novae erupting within symbiotic binaries, in a sense bridging the gap. The reddening is derived to be E(B-V)=0.72 and the fitting to isochrones returns a 3.6Gyr age for the system and 1.35M_{sun}_, 5.3R_{sun}_, and 15L_{sun}_ for the companion. The huge Ne overabundance in the ejecta and the very fast decline from nova maximum both point to a massive white dwarf (M(WD)>=1.1/1.2M_{sun}_). The system is viewed close to pole-on conditions and the current plateau phase is caused by irradiation of the CS by the WD still burning at the surface.2020A&A...639L..10Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/639/L10CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/639/L10https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/639/L10http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/639/L10https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/639/L10https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/639/L10http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/639/L10GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/A+A/639/L10/table1VRI epoch photometry of V392 PerrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian datedtime.epochdoubleVmagV magnitudemagphot.mag;em.opt.Vfloate_VmagError on V magmagstat.error;phot.magfloatRmagR magnitudemagphot.mag;em.opt.Rfloate_RmagError on R magmagstat.error;phot.magfloatImag? I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Error on I magmagstat.error;phot.magfloatnullable