CDROM/PASP/V106/P1120 delta Scuti Variables II: DY Her (Milone+ 1994) ================================================================================ Studies of Large Amplitude delta Scuti Variables II: DY Herculis E. F. Milone, W. J. F. Wilson, D. J. I. Fry, & S. J. Schiller <1994, PASP, 106, 1120> =1994PASP..106.1120M ================================================================================ Abstract: This 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 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 +/- 0.20 Rsun. When combined with effective temperatures from Breger et al. (1978), we find a mean bolometric luminosity of = 21.70 Lsun and a mean absolute magnitude of = 1.41. The radial excursion is 0.149 Rsun. 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 +/- 0.19 Rsun, = 24.56 Lsun and = 1.27. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table1.dat 41 394 Optical Photometry of DY Her (RAO Data) table2.dat 58 140 Optical Photometry of DY Her (McDonald Data) table3.dat 47 51 Infrared Observations of DY Her -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 F9.4 day HJD Heliocentric Julian Date - 2440000 10-17 F8.4 --- Phase Phase 18 1X --- --- Blank 19-25 F7.4 mag DV []? Differential V magnitude 26 A1 --- f_DV *[*] Denotes rejected data point 27-33 F7.4 mag DB []? Differential B magnitude 34 A1 --- f_DB *[*] Denotes rejected data point 35-41 F7.4 mag DI []? Differential I magnitude -------------------------------------------------------------------------------- Notes for file: table1.dat -------------------------------------------------------------------------------- f_DV, f_DB: An asterisk, '*', denotes a rejected data point, one not used in the computation of the light curve or the derivation of the Wesselink radius. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 F9.4 day HJD Heliocentric Julian Date - 2440000 10-17 F8.4 --- Phase Phase 18 1X --- --- Blank 19-25 F7.4 mag DU Differential U magnitude 26 A1 --- f_DU *[*] Denotes rejected data point 27-33 F7.4 mag DB Differential B magnitude 34 A1 --- f_DB *[*] Denotes rejected data point 35-41 F7.4 mag DV Differential V magnitude 42 A1 --- f_DV *[*] Denotes rejected data point 43-49 F7.4 mag DR Differential R magnitude 50 A1 --- f_DR *[*] Denotes rejected data point 51-57 F7.4 mag DI Differential I magnitude 58 A1 --- f_DI *[*] Denotes rejected data point -------------------------------------------------------------------------------- Notes for file: table2.dat -------------------------------------------------------------------------------- f_DU, f_DB, f_DV, f_DR, f_DI: An asterisk, '*', denotes a rejected data point, one not used in the computation of the light curve or the derivation of the Wesselink radius. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-10 F10.5 day HJD Heliocentric Julian Date - 2440000 11-19 F9.5 --- Phase Phase 20 1X --- --- Blank 21-28 F8.5 mag DJ []? Differential J magnitude 29 A1 --- f_DJ *[*] Denotes rejected data point 30-37 F8.5 mag DH []? Differential H magnitude 38 A1 --- f_DH *[*] Denotes rejected data point 39-46 F8.5 mag DK []? Differential K magnitude 47 A1 --- f_DK *[*] Denotes rejected data point -------------------------------------------------------------------------------- Notes for file: table3.dat -------------------------------------------------------------------------------- f_DJ, f_DH, f_DK: An asterisk, '*', denotes a rejected data point, one not used in the computation of the light curve or the derivation of the Wesselink radius. -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 16-Nov-1994