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J/ApJ/551/973       Variables near SN 1991T in NGC 4527      (Saha+, 2001)

Cepheid calibration of the peak brightness of type Ia supernovae. X. SN 1991T in NGC 4527. Saha A., Sandage A., Thim F., Labhardt L., Tammann G.A., Christensen J., Panagia N., Macchetto F.D. <Astrophys. J. 551, 973 (2001)> =2001ApJ...551..973S
ADC_Keywords: Stars, variable ; Photometry ; Stars, distances Keywords: Cepheids - distance scale - galaxies: individual (NGC 4527) - supernovae: individual (SN 1991T) Abstract: Repeated imaging observations have been made of NGC 4527 with the Hubble Space Telescope between 1999 April and June, over an interval of 69 days. Images were obtained on 12 epochs in the F555W band and on five epochs in the F814W band. The galaxy hosted the Type Ia supernova SN 1991T, which showed relatively unusual behaviour by having both an abnormal spectrum near light maximum, and a slower declining light curve than the prototypical Branch-normal SNe Ia. A total of 86 variables that are putative Cepheids have been found, with periods ranging from 7.4 days to over 70 days. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 12 34 10.3 +02 39 56 SN 1991T ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 24 66 Position of the Variable Stars on U42G0101R and U42G0102R images identified in the HST data archive table3.dat 38 1122 Photometry of variable stars: magnitudes and error estimates table4.dat 69 66 Characteristics of the Cepheids table5.dat 42 66 DoPHOT and ROMAFOT mean magnitudes in V and I of 66 Cepheid candidates
See also: B/hst : HST Archived Exposures Catalog (STScI, 2001) J/ApJ/522/802 : Cepheid calibration of SN 1989B in NGC 3627 (Saha+, 1999) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 A6 --- [SST2001] Object identification in a Chip number-Variable number format (CN-VNN) 9- 14 F6.2 pix Xpos X position 17- 22 F6.2 pix Ypos Y position
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- [SST2001] Object identification in a Chip number-Variable number format (CN-VNN) 8- 12 A5 --- Filt Filter name, F555W (∼V band) or F814W (∼I band) 14- 25 F12.4 d HJD Heliocentric Julian date 27- 31 F5.2 mag mag ? WFPC Filt band magnitude 33- 36 F4.2 mag e_mag ? Uncertainty in mag
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 6 A6 --- [SST2001] Object identification in a Chip number-Variable number format (CN-VNN) 8- 13 F6.3 d Per Period 14 A1 --- u_Per Uncertainty flag on Per 16- 21 F6.3 mag Vmag ? Mean V band magnitude 23- 27 F5.3 mag e_Vmag ? Magnitude scatter in Vmag 29- 34 F6.3 mag Imag ? Mean Ic band magnitude 36- 40 F5.3 mag e_Imag ? Magnitude scatter in Imag 42- 47 F6.3 mag ModV ? Apparent distance modulus from Vmag (1) 49- 54 F6.3 mag ModI ? Apparent distance modulus from Imag (2) 56- 61 F6.3 mag ModT ? True distance modulus, corrected for normal extinction (3) 63- 66 F4.2 mag e_ModT ? The RMS uncertainty in ModT 68 I1 --- q_[SST2001] Light-curve quality index on [SST2001] (4)
Note (1): ModV = 2.76*log(Per) + 1.40 + Vmag Note (2): ModI = 3.06*log(Per) + 1.81 + Imag Note (3): ModT = ModV - R' * (ModV - ModI) where R' is the ratio of total to selective absorption. See equation 5. Note (4): Prescription given in Paper V (Saha et al., 1996ApJ...466...55S) and ranges from 0 to 6.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 6 A6 --- [SST2001] Object identification in a Chip number-Variable number format (CN-VNN) 9- 14 F6.3 mag <Vmag>d DoPHOT mean V magnitude 16- 21 F6.3 mag <Imag>d ? DoPHOT mean I magnitude 23 I1 --- q_<Vmag>d ? DoPHOT quality index 25- 29 F5.2 mag <Vmag>r ? ROMAFOT mean V magnitude 31- 35 F5.2 mag <Imag>r ? ROMAFOT mean I magnitude 37 I1 --- q_<Vmag>r ? ROMAFOT quality index
History: From electronic version of the journal References: Saha et al., Paper V 1996ApJ...466...55S Saha et al., Paper VI 1996ApJS..107..693S Sandage et al., Paper VII 1996ApJ...460L..15S Saha et al., Paper VIII 1997ApJ...486....1S Saha et al., Paper IX 1999ApJ...522..802S, Cat. J/ApJ/522/802
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 30-Aug-2001
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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