J/ApJ/701/535ivo://CDS.VizieR/J/ApJ/701/535doi:10.26093/cds/vizier.17010535CDSKimball A.E.Knapp G.R.Ivezic Z.West A.A.Bochanski J.J.,Plotkin R.M.Gordon M.S.2017-06-26T11:49:37Z2011-10-03T10:03:39ZCDS support team

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

cds-question@unistra.frradio-astronomysurveysvisible-astronomysloan-photometryWe conduct a search for radio stars by combining radio and optical data from the FIRST survey (Cat. VIII/71) and the Sloan Digital Sky Survey (SDSS-DR6, Cat. II/282, obsoleted by II/294). The faint limit of SDSS makes possible a homogeneous search for radio emission from stars of low optical luminosity. We select a sample of 112 candidate radio stars in the magnitude range 15<i<~19.1 and with radio flux S_20_>=1.25mJy, from about 7000deg^2^ of sky. The selection criteria are positional coincidence within 1", radio and optical point source morphology, and an SDSS spectrum classified as stellar. The sample contamination is estimated by random matching to be 108+/-13, suggesting that at most a small fraction of the selected candidates are genuine radio stars. Therefore, we rule out a very rare population of extremely radio-loud stars: no more than 1.2 of every million stars in the magnitude range 15<i<19.1 stars has radio flux S_20_>=1.25mJy. We investigate the optical and radio colors of the sample to find candidates that show the largest likelihood of being real radio stars. The significant outliers from the stellar locus, as well as the magnetically active stars, are the best candidates for follow-up radio observations.2009ApJ...701..535Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/701/535CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)II/199 : Radio continuum emission from stars (Wendker, 1995)V/67 : An astrometric catalogue of radio stars (Hering+ 1990)J/A+A/281/161 : Radio emission from stars at 250GHz (Altenhoff+, 1994)http://www.sdss.org/ : SDSS home pagehttp://www.atnf.csiro.au/people/rnorris/emu/ : Evolutionary Map of thehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/701/535https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/701/535http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/701/535https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/701/535https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/701/535http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/701/535GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/701/535/sample (All radio star candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/701/535/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/701/535/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/701/535/sample?GETtext/xml+votable180.050000true9.746964720.311686940.0055555555555555566/2 4107 4128 4199 4243 4287 4322 4334 4338 4345 4352 4384 4394 4490 4565 4595 4615 4647 4668 4678 4704 4741 4802 4860 4875 4966 5006 5049 5259 5261 5281 5428 5471 5730 5886 5957 6004 6051 6165 6229 6234 6238 6257 6262 6267 6271 6352 6387 6433 6459 6480 6507 6540 6545 6612 6653 6933 7289 8222 8264 8287 8297 8356 8407 8480 8514 8580 8642 8659 8661 8736 8944 8978 9022 9025 9074 9121 9147 9155 9175 9252 9276 9290 9331 9341 9348 9369 9395 9396 9432 9435 9440 9458 9475 9611 9633 9734 9902 9904 9927 10154 10415 10422 10521 10545 10692 10894 10904 10958 10963 10981 11063 11095 11099 11119 11160 11202 11232 11396 11456 17235 17500 17501 17806 18021 18071 18624 18771 18859 18860 19047 19097 19099 22012 22359 25925 25959 25967 26187 26396 26398 26407 26414 26446 26526 26608 27243 27290 27306 27312 27411 27538 27542 27544 27573 27591 27625 27636 27659 27679 27698 27723 27780 28027 28193 28282 28421 28428 28512 28576 28658 31359 31404 31618 31622 31649 31652 31656 31695 31696 31713 31719 31731 32436 32482 32508 49010 490189.932213363424795e-25 9.932213363424795e-25https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/701/535?format=asciiOpticalRadiodefaultJ/ApJ/701/535/sampleAll radio star candidatesrmagSDSS r band model magnitudemagphot.mag;em.opt.RfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRSimbad column added by the CDSmeta.notechar[KI2008]Internal identification number (4)meta.id;meta.mainintRAJ2000SDSS Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000SDSS Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainRAFdegFIRST Right Ascension in decimal degrees (J2000)degpos.eq.raDEFdegFIRST Declination in decimal degrees (J2000)degpos.eq.decdoubleSepSeparation between SDSS and FIRST positionsarcsecpos.angDistancefloatDistHeliocentric distance (1)pcpos.distance;pos.heliocentricfloatSpVisually-confirmed MK spectral typesrc.spTypecharHa?[ynm] Spectrum with reliable H{alpha} emission? (y=yes, n=no, m=maybe)meta.codecharSpeakFIRST peak 20cm flux density in mJy/beammJyphot.flux.density;em.radio.750-1500MHzfloatSintFIRST integrated 20cm flux densitymJyphot.flux.density;em.radio.750-1500MHzfloatumagSDSS u band model magnitudemagphot.mag;em.opt.UfloatgmagSDSS g band model magnitudemagphot.mag;em.opt.BfloatimagSDSS i band model magnitudemagphot.mag;em.opt.IfloatzmagSDSS z band model magnitudemagphot.mag;em.opt.Ifloat4DCDFour-dimensional color distance (3)stat.fit.paramfloatR+ODisplay the Radio and Optical data from FIRST (Becker+, 2003, Cat VIII/71) and SDSS-DR7 data (Adelman-McCarthy+, 2009, Cat II/294)meta.ref.urlcharSloanDisplay the SDSS data for this quasarmeta.ref.urlchar