Access to Astronomical Catalogues

← Click to display the menu
J/A+A/392/1129      Automatic observation rendering (AMORE)          (Ng, 2002)

Automatic observation rendering (AMORE). I. On a synthetic stellar population's colour-magnitude diagram. Ng Y.K., Brogt E., Chiosi C., Bertelli G. <Astron. Astrophys. 392, 1129 (2002)> =2002A&A...392.1129N
ADC_Keywords: Models, evolutionary ; Photometry Keywords: methods: data analysis, numerical - stars: HR-diagram, statistics Abstract: A new method, AMORE (AutoMatic Observation REnderer) - based on a genetic algorithm optimizer, is presented for the automated study of colour-magnitude diagrams. The method combines several stellar population synthesis tools developed in the last decade by or in collaboration with the Padova group. Our method is able to recover, within the uncertainties, the parameters - distance, extinction, age, metallicity, index of a power-law initial mass function and the index of an exponential star formation rate - from a reference synthetic stellar population. No a priori information is inserted to recover the parameters, which is done simultaneously and not one at a time. Examples are given to demonstrate and to better understand biases in the results, if one of the input parameters is deliberately set fixed to a non-optimum value. Description: Tablea1.dat provides AMORE with the test population as specified in Sect. 4.3.1. See 2.6.2, 2.6.3, 2.6.4, 2.6.5 and 4.2 for additional details. Tablea2.dat contains the results of running AMORE with one of the astrophysical parameters fixed at its original value. These tests provide an indication about the influence of one parameter on the retrieval of the remaining parameters, see Sects. 4.3.3 and 5.3 for additional details. Tablea3.dat contains the results of running AMORE with one of the parameters fixed at one sigma from its original value. These tests provide an indication about the influence of one parameter on the retrieval of the remaining parameters - in particular, how the remaining parameters balance this mis-match by moving away from their optimal value (see Sects. 4.3.4 and 5.4 of the paper for additional details). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 38 163 AMORE results with the test population as specified in Sect. 4.3.1 of the paper tablea2.dat 85 48 Results of running AMORE with one of the astrophysical parameters fixed at its original value tablea3.dat 88 90 AMORE with one of the parameters fixed at one sigma from its original value
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Nmodel [1/162] Model number 5- 8 F4.2 --- pcross crossover probability 10- 13 F4.2 --- rcross multi-point crossover rate 15- 18 F4.2 --- rbrood amount of offspring two parents can have 20- 22 F3.1 --- pcreep creep mutation rate 24- 26 F3.1 --- pcorr correlated mutation rate 28- 34 F7.5 --- fA Fitness value 36- 38 I3 --- Gen Generation number (1)
Note (1): The generation number indicates at which generation the resulting fitness value fA obtained with AMORE first emerged.
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Param Parameter name 14- 15 I2 --- Nmodel Model number 17- 23 F7.5 --- fA Fitness value 25- 31 F7.5 pc logd Distance 33- 38 F6.3 mag AV Extinction 40- 46 F7.5 [Gyr] logtl Lower age limit 48- 55 F8.5 [Gyr] logth Upper age limit 57- 64 F8.5 [Sun] [Z]l Lower metallicity limit 66- 72 F7.5 [Sun] [Z]h Upper metallicity limit 74- 78 F5.3 --- alpha Slope for the Initial Mass Function power-law 80- 85 F6.3 --- beta Index for the Star Formation Rate exponential
Byte-by-byte Description of file: tablea3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Param Parameter name 14- 15 I2 --- Offset Offset in σ units 17- 18 I2 --- Nmodel Model number 20- 26 F7.5 --- fA ? Fitness value 28- 34 F7.5 pc logd ? Distance 36- 41 F6.3 mag AV ? Extinction 43- 49 F7.5 [Gyr] logtl ? Lower age limit 51- 58 F8.5 [Gyr] logth ? Upper age limit 60- 67 F8.5 [Sun] [Z]l ? Lower metallicity limit 69- 75 F7.5 [Sun] [Z]h ? Upper metallicity limit 77- 81 F5.3 --- alpha ? Slope for the Initial Mass Function power-law 83- 88 F6.3 --- beta ? Index for the Star Formation Rate exponential
History: From electronic version of the journal
(End) Patricia Bauer [CDS] 09-Sep-2002
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

catalogue service

© UDS/CNRS

Contact