J/AJ/115/1894ivo://CDS.VizieR/J/AJ/115/1894doi:10.26093/cds/vizier.51151894CDSStanek K.Z.Kaluzny J.Krockenberger M.Sasselov D.D.,Tonry J.L.Mateo M.2023-04-06T16:50:28Z1999-01-15T10:11:02ZCDS support team

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

cds-question@unistra.frvariable-starseclipsing-binary-starsinfrared-photometryvisible-astronomybroad-band-photometrystellar-radiiWe have undertaken a long-term project, DIRECT, to obtain the direct distances to two important galaxies in the cosmological distance ladder, M31 and M33, using detached eclipsing binaries (DEBs) and Cepheids. While rare and difficult to detect, DEBs provide us with the potential to determine these distances with an accuracy better than 5%. The extensive photometry obtained in order to detect DEBs provides us with good light curves for the Cepheid variables. These are essential to the parallel project to derive direct Baade-Wesselink distances to Cepheids in M31 and M33. For both Cepheids and eclipsing binaries, the distance estimates will be free of any intermediate steps. As a first step in the DIRECT project, between 1996 September and 1997 January we obtained 36 full nights on the Michigan-Dartmouth-MIT Observatory 1.3m telescope and 45 full/partial nights on the F. L. Whipple Observatory 1.2m telescope to search for DEBs and new Cepheids in the M31 and M33 galaxies. In this paper, second in a series, we present the catalog of variable stars, most of them newly detected, found in the field M31A [({alpha},{delta})=(11.34{deg}, 41.73{deg}), J2000.0]. We have found 75 variable stars: 15 eclipsing binaries, 43 Cepheids, and 17 other periodic, possible long-period or nonperiodic variables. The catalog of variables, as well as their photometry and finding charts, is available via anonymous ftp and the World Wide Web. The CCD frames are available upon request.1998AJ....115.1894Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/115/1894CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/115/1016 : M31B eclipsing binaries and Cepheids (Kaluzny+ 1998)J/AJ/117/2810 : M31C eclipsing binaries and Cepheids (Stanek+, 1999)J/AJ/118/346 : M31D eclipsing binaries and Cepheids (Kaluzny+ 1999)J/AJ/118/2211 : M31F eclipsing binaries and Cepheids (Mochejska+ 1999)J/AJ/122/1383 : DIRECT BVI photometry in M31 (Mochejska+, 2001)http://cfa-www.harvard.edu/~kstanek/DIRECT : DIRECT Projecthttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/115/1894https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/115/1894http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/115/1894https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/115/1894https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/115/1894http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/115/1894GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/115/1894/table1 (DIRECT eclipsing binaries in M31A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/115/1894/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/115/1894/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/115/1894/table1?GETtext/xml+votable180.050000true11.271741.64620.005555555555555556Cone search capability for table J/AJ/115/1894/table2 (DIRECT Cepheids in M31A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/115/1894/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/115/1894/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/115/1894/table2?GETtext/xml+votable180.050000true11.317641.78680.005555555555555556Cone search capability for table J/AJ/115/1894/table3 (DIRECT other periodic variables in M31A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/115/1894/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/115/1894/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/115/1894/table3?GETtext/xml+votable180.050000true11.265941.77550.005555555555555556Cone search capability for table J/AJ/115/1894/table4 (DIRECT miscellaneous variables in M31A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/115/1894/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/115/1894/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/115/1894/table4?GETtext/xml+votable180.050000true11.308141.64940.0055555555555555566/2623 2666https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/115/1894?format=asciiOpticalInfrareddefaultJ/AJ/115/1894/table1DIRECT eclipsing binaries in M31AComComment (2)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM31AName (DIRECT VNNNN M31A in Simbad)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J20000)degpos.eq.dec;meta.mainJsVariability index (Paper I, eq. (8))meta.code;src.varfloatPerPerioddtime.periodfloatVmaxV magnitude at maximum brightnessmagphot.mag;em.opt.VfloatImax? Maximum I magnitudemagphot.mag;em.opt.I;stat.maxfloatnullableRad1Radius of the primary component (1)phys.size.radius;arith.ratiofloatRad2Radius of the secondary component (1)phys.size.radius;arith.ratiofloatiInclination angledegsrc.orbital.inclinationinteEccentricitysrc.orbital.eccentricityfloatJ/AJ/115/1894/table2DIRECT Cepheids in M31ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM31AName (DIRECT VNNNN M31A in Simbad)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainJsVariability indexmeta.code;src.varfloatPerPerioddtime.periodfloat<V>Flux-weighted mean V magnitudemagphot.mag;em.opt.Vfloat<I>? Flux-weighted mean I magnitudemagphot.mag;em.opt.IfloatnullableAmpAmplitude of the variationmagsrc.var.amplitudefloatComComments (1)meta.notecharJ/AJ/115/1894/table3DIRECT other periodic variables in M31ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM31AName (DIRECT VNNNN M31A in Simbad)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainJsVariability indexmeta.code;src.varfloatPer? Period (only in table3.dat)dtime.periodfloatnullableVbarError-weighted mean V magnitudemagphot.mag;stat.meanfloatIbar? Error-weighted mean I magnitudemagphot.mag;stat.meanfloatnullablee_VmagStandard deviation in the V bandmagstat.errorfloate_Imag? Standard deviation in the I bandmagstat.errorfloatnullableComComments (1)meta.notecharJ/AJ/115/1894/table4DIRECT miscellaneous variables in M31Ae_VmagStandard deviation in the V bandmagstat.errorfloate_Imag? Standard deviation in the I bandmagstat.errorfloatnullableComComments (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM31AName (DIRECT VNNNN M31A in Simbad)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainJsVariability indexmeta.code;src.varfloatPer? Period (only in table3.dat)dtime.periodfloatnullableVbarError-weighted mean V magnitudemagphot.mag;stat.meanfloatIbar? Error-weighted mean I magnitudemagphot.mag;stat.meanfloatnullableJ/AJ/115/1894/table5Light curves of eclipsing binaries in M31ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM31AName (VNNNN)meta.id;meta.maincharprimaryBand[IV] Bandinstr.bandpasscharHJDHeliocentric Julian datedtime.epochdoubleMagMagnitude in the band (I or V)magphot.mag;em.opt.Vfloate_Magrms uncertainty on Magmagstat.errorfloatJ/AJ/115/1894/table6Light curves of Cepheids in M31ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM31AName (VNNNN)meta.id;meta.maincharprimaryBand[IV] Bandinstr.bandpasscharHJDHeliocentric Julian datedtime.epochdoubleMagMagnitude in the band (I or V)magphot.mag;em.opt.Vfloate_Magrms uncertainty on Magmagstat.errorfloatJ/AJ/115/1894/table7Light curves of other periodic variables in M31ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM31AName (VNNNN)meta.id;meta.maincharprimaryBand[IV] Bandinstr.bandpasscharHJDHeliocentric Julian datedtime.epochdoubleMagMagnitude in the band (I or V)magphot.mag;em.opt.Vfloate_Magrms uncertainty on Magmagstat.errorfloatJ/AJ/115/1894/table8Light curves of miscellaneous variables in M31ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM31AName (VNNNN)meta.id;meta.maincharprimaryBand[IV] Bandinstr.bandpasscharHJDHeliocentric Julian datedtime.epochdoubleMagMagnitude in the band (I or V)magphot.mag;em.opt.Vfloate_Magrms uncertainty on Magmagstat.errorfloat