DEEP ADVANCED CAMERA FOR SURVEYS IMAGING IN THE GLOBULAR CLUSTER NGC 6397: REDUCTION METHODS
| العنوان: | DEEP ADVANCED CAMERA FOR SURVEYS IMAGING IN THE GLOBULAR CLUSTER NGC 6397: REDUCTION METHODS |
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| المؤلفون: | Jarrod R. Hurley, Gregory G. Fahlman, Ivan R. King, Jasonjot S. Kalirai, Jay Anderson, R. Michael Rich, Harvey B. Richer, Brad M. S. Hansen, Peter B. Stetson |
| المصدر: | The Astronomical Journal. 135:2114-2128 |
| بيانات النشر: | American Astronomical Society, 2008. |
| سنة النشر: | 2008 |
| مصطلحات موضوعية: | Physics, globular clusters: individual (NGC 6397), 010308 nuclear & particles physics, White dwarf, techniques: image processing, Astronomy and Astrophysics, Astrophysics, 01 natural sciences, Measure (mathematics), Reduction methods, Galaxy, Data set, techniques: photometric, Stars, stars: low-mass, Space and Planetary Science, Globular cluster, Completeness (order theory), 0103 physical sciences, astrometry, 010303 astronomy & astrophysics, brown dwarfs, white dwarfs |
| الوصف: | We describe here the reduction methods that we developed to study the faintest red dwarfs and white dwarfs in an outer field of NGC6397, which was observed by \hst for 126 orbits in 2005. The particular challenge of this data set is that the faintest stars are not readily visible in individual exposures, so special care must be taken to combine the information in all the exposures in order to identify and measure them. Unfortunately, it is hard to find the faintest stars without also finding a large number of faint galaxies, so we developed specialized tools to distinguish between the point-like stars and the barely resolved galaxies. We found that artificial-star tests, while obviously necessary for completeness determination, can also play an important role in helping us optimize our finding and measuring algorithms. Although this paper focuses on this data set specifically, many of the techniques are new and might find application in other work, particularly when a large number of images is available for a single field. |
| تدمد: | 1538-3881 0004-6256 |
| DOI: | 10.1088/0004-6256/135/6/2114 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ca44575a2485640a1d3b251804c5c93 https://doi.org/10.1088/0004-6256/135/6/2114 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....3ca44575a2485640a1d3b251804c5c93 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15383881 00046256 |
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| DOI: | 10.1088/0004-6256/135/6/2114 |