J/PASP/106/1120ivo://CDS.VizieR/J/PASP/106/1120doi:10.26093/cds/vizier.61061120CDSMilone E.F.Wilson W.J.F.Fry D.J.I.Schiller S.J.2025-09-09T14:11:45Z1997-12-09T21:44:40ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomybroad-band-photometryThis is the second paper in a series on large-amplitude delta Scuti stars intended to determine Baade-Wesselink radii and luminosities with precision. The first paper (Wilson et al., 1993PASP..105..809W) discussed our method of analysis and its application to EH Librae; in this we discuss the observations and analysis of DY Herculis. Optical and infrared photometry and cross-correlated radial-velocity data have been obtained and analyzed. Fourier representations for the UBVRIJHK light curves and for the radial-velocity curves were used to derive a value for the minimum radius for each of 60 combinations of flux and color index. From these we adopt a mean value for the minimum radius of R_min_=2.77+/-0.20R_{sun}_. When combined with effective temperatures from Breger et al. (1978PASP...90..754B), we find a mean bolometric luminosity of <L_B_>=21.70L_{sun}_ and a mean absolute magnitude of <M_B_>=1.41. The radial excursion is 0.149R_{sun}_. We use the same procedure to improve our results for EH Librae, deriving R_min_ for each of 42 combinations of flux and color index, and obtain mean values of R_min_=2.62+/-0.19R_{sun}_, <L_B_>=24.56L_{sun}_ and <M_B_>=1.27. Addresses: Milone E.F. milone@acs.ucalgary.ca Wilson W.J.F. wjfwilso@acs.ucalgary.ca Fry D.J.I. fry@acs.ucalgary.ca Rothney Astrophysical Observatory, Department of Physics and Astronomy, University of Calgary, 2500 University Drive, NW, Calgary AB T2N 1N4, Canada Schiller S.J. SchilleS@mg.sdstate.edu Physics Department, South Dakota State University, Box 2219, Brookings, South Dakota 57007-03951994PASP..106.1120Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/106/1120CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/106/1120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/106/1120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/106/1120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/106/1120https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/106/1120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/106/1120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/PASP/106/1120/table1Optical photometry of DY Her (RAO Data)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublePhase[0/1[ Phasetime.phasefloatDVmag[]? Differential V magnitudemagphot.mag;arith.difffloatn_DVmag[*] "*" denotes rejected data point (1)meta.notecharDBmag[]? Differential B magnitudemagphot.mag;arith.difffloatn_DBmag[*] "*" denotes rejected data point (1)meta.notecharDImag[]? Differential I magnitudemagphot.mag;arith.difffloatJ/PASP/106/1120/table2Optical photometry of DY Her (McDonald Data)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublePhase[0/1[ Phasetime.phasefloatDUmagDifferential U magnitudemagphot.mag;arith.difffloatn_DUmag[*] "*" denotes rejected data point (1)meta.notecharDBmagDifferential B magnitudemagphot.mag;arith.difffloatn_DBmag[*] "*" denotes rejected data point (1)meta.notecharDVmagDifferential V magnitudemagphot.mag;arith.difffloatn_DVmag[*] "*" denotes rejected data point (1)meta.notecharDRmagDifferential R magnitudemagphot.mag;arith.difffloatn_DRmag[*] "*" denotes rejected data point (1)meta.notecharDImagDifferential I magnitudemagphot.mag;arith.difffloatn_DImag[*] "*" denotes rejected data point (1)meta.notecharJ/PASP/106/1120/table3Infrared observations of DY HerrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoublePhase[0/1[ Phasetime.phasedoubleDJmag[]? Differential J magnitudemagphot.mag;arith.diffdoublen_DJmag[*] "*" denotes rejected data point (1)meta.notecharDHmag[]? Differential H magnitudemagphot.mag;arith.diffdoublen_DHmag[*] "*" denotes rejected data point (1)meta.notecharDKmag[]? Differential K magnitudemagphot.mag;arith.diffdoublen_DKmag[*] "*" denotes rejected data point (1)meta.notechar