J/ApJ/771/13ivo://CDS.VizieR/J/ApJ/771/13doi:10.26093/cds/vizier.17710013CDSLepo K.van Kerkwijk M.2015-03-01T21:44:51Z2015-02-06T06:35:15ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsvisible-astronomyWide-band photometryultraviolet-photometryinfrared-photometryThe nature of the progenitors of Type Ia supernovae (SNe Ia) is still a mystery. While plausible candidates are known for both the single-degenerate and double-degenerate models, the observed numbers fall significantly short of what is required to reproduce the SNe Ia rate. Some of the most promising single-degenerate Type Ia progenitors are recurrent novae and super-soft sources (SSS). White dwarfs (WDs) with higher mass transfer rates can also be SN Ia progenitors. For these rapidly accreting white dwarfs (RAWDs), more material than is needed for steady burning accretes on the WD, and extends the WD's photosphere. Unlike SSS, such objects will likely not be detectable at soft X-ray energies, but will be bright at longer wavelengths, such as the far-ultraviolet (UV). Possible examples include LMC N66 and the V Sagittae stars. We present a survey using multi-object spectrographs looking for RAWDs in the central core of the Small Magellanic Cloud (SMC), from objects selected to be bright in the far-UV and with blue far UV-V colors. While we find some unusual objects, and recover known planetary nebula and Wolf-Rayet (WR) stars, we detect no candidate RAWD. The upper limits from this non-detection depend on our expectations of what an RAWD should look like, as well assumptions about the internal extinction of the SMC. Assuming they resemble LMC N66 or fainter versions of WR stars we set an upper limit of 10-14 RAWDs in the SMC. However, our survey is unlikely to detect objects like V Sge, and hence we cannot set meaningful upper limits if RAWDs generally resemble V Sge.2013ApJ...771...13Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/771/13CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)VI/104 : The Ultraviolet Imaging Telescope (UIT) (1990, 1995)J/ApJ/745/173 : UV absorption sight lines of LMC and SMC (Welty+, 2012)J/ApJS/187/275 : Photometric histories of recurrent novae (Schaefer, 2010)J/PASP/121/634 : FUSE observations in Magellanic Clouds (Blair+, 2009)J/ApJ/700/844 : Rotation rates of very massive stars (Penny+, 2009)J/AJ/127/1632 : UBVR(UIT) photometry of O and OB stars in SMC (Oey+, 2004)J/AJ/123/855 : Magellanic Clouds Photometric Survey: SMC (Zaritsky+, 2002)J/AJ/116/180 : Magellanic clouds ultraviolet observations (Parker+ 1998)J/AJ/113/1011 : UV Observations of the SMC (Cornett+ 1997)J/ApJ/425/122 : IMF from UV stellar photometry (Hill+, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/771/13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/771/13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/771/13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/771/13https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/771/13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/771/13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/771/13/table1 (Combined UIT (Cornett et al. 1997, J/AJ/113/1011) and MCPS (Zaritsky et al. 2002, J/AJ/123/855) catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/771/13/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/771/13/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/771/13/table1?GETtext/xml+votable180.050000true11.45112-72.937580.0055555555555555566/33294 33295 33306 33316 33317 333288.650015785639275e-20 1.3156783373429717e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/771/13?format=asciiUVOpticalInfrareddefaultJ/ApJ/771/13/table1Combined UIT (Cornett et al. 1997, J/AJ/113/1011) and MCPS (Zaritsky et al. 2002, J/AJ/123/855) cataloge_Ksmag[0.03/10]? Error in Ksmagmagstat.error;phot.mag;em.IR.KfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameUSS catalog namemeta.id;meta.tablecharRAOdegOriginal UIT Right Ascension J2000degpos.eq.raDEOdegOriginal UIT Declination J2000degpos.eq.decRAUdegRevised UIT Right Ascension J2000 (1)degpos.eq.raDEUdegRevised UIT Declination J2000 (1)degpos.eq.decm162[9.3/16.7] UIT 162nm-band magnitudemagphot.mag;em.UV.100-200nmfloate_m162[0.02/0.6] Error in m162magstat.errorfloatFieldUIT SMC field (f1, f2, f3 or f4)meta.id;obs.fieldcharRAJ2000MCPS Right Ascension J2000 (2)degpos.eq.ra;meta.mainDEJ2000MCPS Declination J2000 (2)degpos.eq.dec;meta.mainUmag? MCPS U magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag? Error in Umagmagstat.error;phot.mag;em.opt.UfloatnullableBmag? MCPS B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.BfloatnullableVmag[10.4/21.4]? MCPS V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.01/0.6]? Error in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableImag? MCPS I magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Error in Imagmagstat.error;phot.mag;em.opt.IfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Error in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Error in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag[5.7/16.2]? 2MASS Ks magnitudemagphot.mag;em.IR.KfloatnullableSep[0.02/3] Separation between revised UIT and MCPS positionsarcsecpos.angDistancefloatUITCross-match with UIT catalog (J/AJ/113/1011) within 11"meta.ref.urlintnullableMCPSDisplay the MCPS data (Cat. J/AJ/123/855) within 0.5"meta.ref.urlchar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246) within 1"meta.ref.urlchar