Difference Image Analysis of Defocused Observations with CSTAR
The Chinese Small Telescope ARray (CSTAR) carried out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter seasons of 2008, 2009 and 2010. Aperture photometry of the 2008 and 2010 i-band images resulted in the discovery of over 2...
Main Authors: | , , , , , , , , , , , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
arXiv
2014
|
Subjects: | |
Online Access: | https://dx.doi.org/10.48550/arxiv.1410.4544 https://arxiv.org/abs/1410.4544 |
id |
ftdatacite:10.48550/arxiv.1410.4544 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.48550/arxiv.1410.4544 2023-05-15T13:57:35+02:00 Difference Image Analysis of Defocused Observations with CSTAR Oelkers, Ryan J. Macri, Lucas M. Wang, Lifan Ashley, Michael C. B. Cui, Xiangqun Feng, Long-Long Gong, Xuefei Lawrence, Jon S. Qiang, Liu Luong-Van, Daniel Pennypacker, Carl R. Yang, Huigen Yuan, Xiangyan York, Donald G. Zhou, Xu Zhu, Zhenxi 2014 https://dx.doi.org/10.48550/arxiv.1410.4544 https://arxiv.org/abs/1410.4544 unknown arXiv https://dx.doi.org/10.1088/0004-6256/149/2/50 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences article-journal Article ScholarlyArticle Text 2014 ftdatacite https://doi.org/10.48550/arxiv.1410.4544 https://doi.org/10.1088/0004-6256/149/2/50 2022-04-01T12:46:34Z The Chinese Small Telescope ARray (CSTAR) carried out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter seasons of 2008, 2009 and 2010. Aperture photometry of the 2008 and 2010 i-band images resulted in the discovery of over 200 variable stars. Yearly servicing left the array defocused for the 2009 winter season, during which the system also suffered from intermittent frosting and power failures. Despite these technical issues, nearly 800,000 useful images were obtained using g, r & clear filters. We developed a combination of difference imaging and aperture photometry to compensate for the highly crowded, blended and defocused frames. We present details of this approach, which may be useful for the analysis of time-series data from other small-aperture telescopes regardless of their image quality. Using this approach, we were able to recover 68 previously-known variables and detected variability in 37 additional objects. We also have determined the observing statistics for Dome A during the 2009 winter season; we find the extinction due to clouds to be less than 0.1 and 0.4 mag for 40% and 63% of the dark time, respectively. : 13 pages, 16 figures, accepted for publication in the Astronomical Journal Text Antarc* Antarctic DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
spellingShingle |
Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences Oelkers, Ryan J. Macri, Lucas M. Wang, Lifan Ashley, Michael C. B. Cui, Xiangqun Feng, Long-Long Gong, Xuefei Lawrence, Jon S. Qiang, Liu Luong-Van, Daniel Pennypacker, Carl R. Yang, Huigen Yuan, Xiangyan York, Donald G. Zhou, Xu Zhu, Zhenxi Difference Image Analysis of Defocused Observations with CSTAR |
topic_facet |
Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
description |
The Chinese Small Telescope ARray (CSTAR) carried out high-cadence time-series observations of 27 square degrees centered on the South Celestial Pole during the Antarctic winter seasons of 2008, 2009 and 2010. Aperture photometry of the 2008 and 2010 i-band images resulted in the discovery of over 200 variable stars. Yearly servicing left the array defocused for the 2009 winter season, during which the system also suffered from intermittent frosting and power failures. Despite these technical issues, nearly 800,000 useful images were obtained using g, r & clear filters. We developed a combination of difference imaging and aperture photometry to compensate for the highly crowded, blended and defocused frames. We present details of this approach, which may be useful for the analysis of time-series data from other small-aperture telescopes regardless of their image quality. Using this approach, we were able to recover 68 previously-known variables and detected variability in 37 additional objects. We also have determined the observing statistics for Dome A during the 2009 winter season; we find the extinction due to clouds to be less than 0.1 and 0.4 mag for 40% and 63% of the dark time, respectively. : 13 pages, 16 figures, accepted for publication in the Astronomical Journal |
format |
Text |
author |
Oelkers, Ryan J. Macri, Lucas M. Wang, Lifan Ashley, Michael C. B. Cui, Xiangqun Feng, Long-Long Gong, Xuefei Lawrence, Jon S. Qiang, Liu Luong-Van, Daniel Pennypacker, Carl R. Yang, Huigen Yuan, Xiangyan York, Donald G. Zhou, Xu Zhu, Zhenxi |
author_facet |
Oelkers, Ryan J. Macri, Lucas M. Wang, Lifan Ashley, Michael C. B. Cui, Xiangqun Feng, Long-Long Gong, Xuefei Lawrence, Jon S. Qiang, Liu Luong-Van, Daniel Pennypacker, Carl R. Yang, Huigen Yuan, Xiangyan York, Donald G. Zhou, Xu Zhu, Zhenxi |
author_sort |
Oelkers, Ryan J. |
title |
Difference Image Analysis of Defocused Observations with CSTAR |
title_short |
Difference Image Analysis of Defocused Observations with CSTAR |
title_full |
Difference Image Analysis of Defocused Observations with CSTAR |
title_fullStr |
Difference Image Analysis of Defocused Observations with CSTAR |
title_full_unstemmed |
Difference Image Analysis of Defocused Observations with CSTAR |
title_sort |
difference image analysis of defocused observations with cstar |
publisher |
arXiv |
publishDate |
2014 |
url |
https://dx.doi.org/10.48550/arxiv.1410.4544 https://arxiv.org/abs/1410.4544 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://dx.doi.org/10.1088/0004-6256/149/2/50 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1410.4544 https://doi.org/10.1088/0004-6256/149/2/50 |
_version_ |
1766265284987977728 |