Hidden population of AM CVns in the SDSS J/MNRAS/429/2143 ivo://CDS.VizieR/J/MNRAS/429/2143 doi:10.26093/cds/vizier.74292143 CDS Carter P.J. Marsh T.R. Steeghs D. Groot P.J. Nelemans G. Levitan D.,Rau A. Copperwheat C.M. Kupfer T. Roelofs G.H.A. 2024-07-20T20:13:54Z 2013-03-22T12:28:49Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr spectroscopy cataclysmic-variable-stars white-dwarf-stars surveys quasars We present the latest results from a spectroscopic survey designed to uncover the hidden population of AM Canum Venaticorum (AM CVn) binaries in the photometric database of the Sloan Digital Sky Survey (SDSS). We selected ~2000 candidates based on their photometric colours, a relatively small sample which is expected to contain the majority of all AM CVn binaries in the SDSS (expected to be ~50). We present two new candidate AM CVn binaries discovered using this strategy: SDSS J104325.08+563258.1 and SDSS J173047.59+554518.5. We also present spectra of 29 new cataclysmic variables, 23 DQ white dwarfs and 21 DZ white dwarfs discovered in this survey. The survey is now approximately 70 per cent complete, and the discovery of seven new AM CVn binaries indicates a lower space density than previously predicted. From the essentially complete g~19 sample, we derive an observed space density of (5+/-3)*10^-7^pc^-3^; this is lower than previous estimates by a factor of 3. The sample has been cross-matched with the GALEX All-Sky Imaging Survey database, and with Data Release 9 of the UKIRT (United Kingdom Infrared Telescope) Infrared Deep Sky Survey (UKIDSS). The addition of UV photometry allows new colour cuts to be applied, reducing the size of our sample to ~1100 objects. Optimising our followup should allow us to uncover the remaining AM CVn binaries present in the SDSS, providing the larger homogeneous sample required to more reliably estimate their space density. 2013MNRAS.429.2143C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/429/2143 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) http://www.sdss.org : SDSS Home Page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/429/2143 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/429/2143 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/429/2143 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/429/2143 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/429/2143 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/429/2143 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/429/2143/tablea1 (Target catalogue with coordinates and magnitudes) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/429/2143/tablea1? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/429/2143/tablea1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/429/2143/tablea1? 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ascension (J2000) pos.eq.ra;meta.main recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int DEJ2000 Declination (J2000) pos.eq.dec;meta.main FUVmag ? GALEX FUV magnitude mag phot.mag;em.UV float nullable e_FUVmag ? GALEX FUVmag error mag stat.error;phot.mag;em.UV.FUV float nullable NUVmag ? GALEX NUV magnitude mag phot.mag;em.UV float nullable e_NUVmag ? GALEX NUVmag error mag stat.error;phot.mag float nullable umag SDSS u magnitude mag phot.mag;em.opt.U float e_umag SDSS umag error mag stat.error;phot.mag;em.opt.U float gmag SDSS g magnitude mag phot.mag;em.opt.B float e_gmag SDSS gmag error mag stat.error;phot.mag;em.opt.B float rmag SDSS r magnitude mag phot.mag;em.opt.R float e_rmag SDSS rmag error mag stat.error;phot.mag;em.opt.R float imag SDSS i magnitude mag phot.mag;em.opt.I float e_imag SDSS imag error mag stat.error;phot.mag;em.opt.I float zmag SDSS z magnitude mag phot.mag;em.opt.I float e_zmag SDSS zmag error mag stat.error;phot.mag;em.opt.I float Ag g band extinction (1) mag phys.absorption float Type Spectral classification spect.index char sp spectrum plot meta.ref.url char spFile Spectrum filename (2) meta.id;meta.file char Obs Observation date s time.epoch;obs nullable ExpTime ? Exposure time s time.duration;obs.exposure int nullable Sloan Display the SDSS data for this star meta.ref.url char DR7 Photometric details from SDSS-DR7 and DR9 meta.ref.url char