J/A+A/389/439ivo://CDS.VizieR/J/A+A/389/439doi:10.26093/cds/vizier.33890439CDSNedialkov P.Orio M.Birkle KConselice C.Della Valle M.Greiner J.,Magnier E.Tikhonov N.A.2002-08-06T21:51:24Z2002-08-06T21:50:49ZCDS support team

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

cds-question@unistra.frx-ray-sourcesastronomical-object-identificationinfrared-photometryvisible-astronomybroad-band-photometryWe propose the first association of an optical counterpart with a luminous supersoft X-ray source in M31, RX J0044.0+4118, observed with ROSAT in July 1991. The PSPC position is at 1.644 angular distance from a candidate nova in outburst in September of 1990. This is interesting because the incidence of classical novae among supersoft X-ray sources is an open question. The proposed optical counterpart was measured at R~=17.7 in September of 1990, and it had faded to R>19.2 when it was observed again after 70 days. The light curve was too sparsely monitored for definite conclusions on the speed class of the nova. No other variable objects with V<23.5 were found in the ROSAT spatial error box. We evaluate that the probability that a classical or recurrent nova was in outburst in the ROSAT error box in the few years preceding the observation is very small, so the proposed identification is meaningful. We also show evidence that the associated supersoft X-ray source turned off in the third year after the outburst.2002A&A...389..439Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/389/439CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/208 : BVRI CCD photometry in the field of M 31 (Magnier+ 1992)J/A+AS/92/625 : Ionized nebulae in M31 (Walterbos+ 1992)J/A+A/317/328 : ROSAT PSPC survey of M 31 (Supper+ 1997)J/A+A/373/63 : M31 second ROSAT PSPC survey (Supper+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/389/439https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/389/439http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/389/439https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/389/439https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/389/439http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/389/439GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/389/439/table3 (Photometry obtained for all the stars in the ROSAT-PSPC error circle of 15 arcsec)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/389/439/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/389/439/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/389/439/table3?GETtext/xml+votable180.050000true11.01937541.305750.0055555555555555566/2623https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/389/439?format=asciiX-rayOpticalInfrareddefaultJ/A+A/389/439/table3Photometry obtained for all the stars in the ROSAT-PSPC error circle of 15 arcsecrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/86] Sequential numbermeta.idintDistAngular distance from the position of the supersoft X-ray source, RX J004404.8+411820arcsecpos.angDistancefloatRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmag? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.errorfloatnullableB-V? B-V colour index or Bmag if n_B-V=Bmagphot.color;em.opt.B;em.opt.Vfloatnullablen_B-V[B] If B, then B magnitude in B-V columnmeta.notechare_B-V? rms uncertainty on B-V or Bmagmagstat.errorfloatnullableV-R? V-R colour index or Rmag if n_V-R=Rmagphot.color;em.opt.V;em.opt.Rfloatnullablen_V-R[R] If R, then R magnitude in V-R columnmeta.notechare_V-R? rms uncertainty on V-R or Rmagmagstat.errorfloatnullableR-I? R-I colour index or Imag if n_R-I=Imagphot.color;em.opt.R;em.opt.Ifloatnullablen_R-I[I] If I, then I magnitude on R-I columnmeta.notechare_R-I? rms uncertainty on R-I or Imagmagstat.errorfloatnullableIdIdentifications (1)meta.idchar