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J/ApJ/512/48      VI photometry of new Cepheids in NGC 4725  (Gibson+, 1999)

The Hubble Space Telescope key project on the extragalactic distance scale. XVII. The Cepheid distance to NGC 4725 Gibson B.K., Hughes S.M.G., Stetson P.B., Freedman W.L., Kennicutt R.C.Jr, Mould J.R., Bresolin F., Ferrarese L., Ford H.C., Graham J.A., Han M., Harding P., Hoessel J.G., Huchra J.P., Illingworth G.D., Kelson D.D., Macri L.M., Madore B. F., Phelps R.L., Prosser C.F., Saha A., Sakai S., Sebo K.M., Silbermann N.A., Turner A.M. <Astrophys. J. 512, 48 (1999)> =1999ApJ...512...48G
ADC_Keywords: Stars, variable ; Photometry Mission_Name: HST Keywords: Cepheids - distance scale - galaxies: distances and redshifts - galaxies: individual (NGC 4725) Abstract: The distance to NGC 4725 has been derived from Cepheid variables as part of the Hubble Space Telescope Key Project on the Extragalactic Distance Scale. Thirteen F555W (V) and four F814W (I) epochs of cosmic-ray-split Wide Field and Planetary Camera 2 observations were obtained. Twenty Cepheids were discovered, with periods ranging from 12 to 49 days. Adopting a Large Magellanic Cloud distance modulus and extinction of 18.50±0.10 mag and E(V-I)=0.13 mag, respectively, a true reddening-corrected distance modulus (based on an analysis employing the ALLFRAME software package) of 30.50±0.16 (random) ±0.17 (systematic) mag was determined for NGC 4725. The corresponding of distance of 12.6±1.0 (random) ±1.0 (systematic) Mpc is in excellent agreement with that found with an independent analysis based upon the DoPHOT photometry package. With a foreground reddening of only E(V-I)=0.02, the inferred intrinsic reddening of this field in NGC 4725, E(V-I)=0.19, makes it one of the most highly reddened fields encountered by the HST Key Project to date. Objects: ------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------ 12 50 27 +25 30 6 NGC 4725 = UGC 7989 ------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 43 20 Cepheid candidates detected in NGC 4725 table5.dat 111 20 Detected Cepheid candidates's properties table6a.dat 32 540 V band magnitudes and errors table6b.dat 35 181 I band magnitudes and errors
See also: J/ApJ/463/26 : Extragalactic Distance Scale Key Project. III (Kelson+ 1996) J/ApJ/507/655 : VI photometry of new Cepheids in NGC 2541 (Ferrarese+, 1998) J/ApJ/508/491 : M101 Cepheids (Stetson+, 1998) J/ApJ/521/155 : Extragalactic distance scale key project. XVIII. (Macri+, 1999) J/ApJ/514/614 : VI photometry of new Cepheids in NGC 3198 (Kelson+, 1999) J/ApJ/529/723 : VI photometry of Cepheids (Gibson+, 2000) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Ceph Cepheid identification number 8 I1 --- Chip WFPC chip cepheid is located on (1 is the PC chip) 10- 14 F5.1 --- XPix The x pixel coordinate 16- 20 F5.1 --- YPix The y pixel coordinate 22- 23 I2 h RAh Right Ascension (J2000) 25- 26 I2 min RAm Right Ascension (J2000) 28- 32 F5.2 s RAs Right Ascension (J2000) 34- 35 I2 deg DEd Declination (J2000) 37- 38 I2 arcmin DEm Declination (J2000) 40- 43 F4.1 arcsec DEs Declination (J2000)
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Ceph Cepheid identification number 6- 10 F5.2 d Per Cepheid period from ALLFRAME 13- 16 F4.2 d e_Per Uncertainty in Per 18- 22 F5.2 mag Vmag V band magnitude from ALLFRAME 25- 28 F4.2 mag e_Vmag Uncertainty in Vmag 30- 34 F5.2 mag Imag I band magnitude from ALLFRAME 37- 40 F4.2 mag e_Imag Uncertainty in Imag 42- 45 F4.1 d DPer Cepheid period from DoPHOT 47- 51 F5.2 mag DVmag V band magnitude from DoPHOT 54- 57 F4.2 mag e_DVmag Uncertainty in DVmag 59- 63 F5.2 mag DImag I band magnitude from DoPHOT 66- 69 F4.2 mag e_DImag Uncertainty in Imag 72-111 A40 --- Com Comments on Cepheids canidates
Byte-by-byte Description of file: table6a.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Ceph Cepheid identification number 6- 14 F9.3 d JD Julian date of observation (JD-2440000.000) 18 A1 --- Filt Filter used in observation 21- 25 F5.2 mag Vmag Observed magnitude in the Filt band 28- 31 F4.2 mag e_Vmag Uncertainty in Vmag
Byte-by-byte Description of file: table6b.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Ceph Cepheid identification number 6- 14 F9.3 d JD Julian date of observation (JD-2440000.000) 18 A1 --- Filt Filter used in observation 21- 25 F5.2 mag Imag ? Observed magnitude in the Filt band 28- 31 F4.2 mag e_Imag ? Uncertainty in Imag
History: From ApJ electronic edition. References: (Paper I) Freedman+ 1994ApJ...427..628F (Paper II) Hughes+ 1994ApJ...428..143H (Paper III) Kelson+ 1996ApJ...463...26K, Cat. J/ApJ/463/26 (Paper IV) Ferrarese+ 1996ApJ...464..568F (Paper VI) Silbermann+ 1996ApJ...470....1S (Paper VII) Graham+ 1997ApJ...477..535G (Paper VIII) Rawson+ 1997ApJ...490..517R (Paper IX) Phelps+ 1998ApJ...500..763P (Paper X) Hughes+ 1998ApJ...501...32H (Paper XI) Turner+ 1998ApJ...505..207T (Paper XII) Ferrarese+ 1998ApJ...507..655F, Cat. J/ApJ/507/655 (Paper XIII) Kennicutt+ 1998ApJ...498..181K (Paper XIV) Silbermann+ 1999ApJ...515....1S (Paper XV) Madore+ 1999ApJ...515...29M (Paper XVI) Stetson+ 1998ApJ...508..491S (Paper XVIII) Macri+ 1999ApJ...521..155M, Cat. J/ApJ/521/155 (Paper XIX) Kelson+ 1999ApJ...514..614K (Paper XX) Graham+ 1999ApJ...516..626G (Paper XXI) Mould+ 2000ApJ...528..655M (Paper XXII) Prosser+ 1999ApJ...525...80P (Paper XXIII) Sakai+ 1999ApJ...523..540S (Paper XXIV) Sakai+ 2000ApJ...529..698S (Paper XXV) Gibson+ 2000ApJ...529..723G, Cat. J/ApJ/529/723 (Paper XXVI) Ferrarese+ 2000ApJ...529..745F (Paper XXVII) Kelson+ 2000ApJ...529..768K (Paper XXVIII) Mould+ 2000ApJ...529..786M
(End) Greg Schwarz [AAS] 29-Feb-2000
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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