PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE
We performed CCD photometric observations of the W-type contact binary AB And for 10 nights from November 1995 to December 1999 using the 61-cm reflector and BVR filters at Sobaeksan Optical Astronomy Observatory. From our observations, the seasonal light curves of AB And for 1995, 1996 and 1999 wer...
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doaj-9fec3fbc986e419f9f784bdb8739f9be2020-11-25T00:54:38ZengKorean Space Science Society (KSSS)Journal of Astronomy and Space Sciences2093-55872093-14092003-06-0120212313210.5140/JASS.2003.20.2.123 PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAEJae Woo Lee0Chun-Hwey Kim1Wonyong Han2Ho Jin3Kyu-Dong Oh4Department of Astronomy & Space Science, College of Natural Sciences and Institute for Basic Science Research, Chungbuk National University, Cheongju, 361-763, KoreaDepartment of Astronomy & Space Science, College of Natural Sciences and Institute for Basic Science Research, Chungbuk National University, Cheongju, 361-763, KoreaKorea Astronomy Observatory, Daejon 305-348, KoreaKorea Astronomy Observatory, Daejon 305-348, KoreaDepartment of Earth Science Education, Chonnam National University, Gwangju 500-757, KoreaWe performed CCD photometric observations of the W-type contact binary AB And for 10 nights from November 1995 to December 1999 using the 61-cm reflector and BVR filters at Sobaeksan Optical Astronomy Observatory. From our observations, the seasonal light curves of AB And for 1995, 1996 and 1999 were completed and 8 new times of minimum light were determined. Newly obtained light curves show that strong light variations occurred in AB And during the past five years. We adopted the 1996 light curves as reference ones and obtained the photometric solutions of them with contact mode in the Wilson-Devinney binary code. Assuming such light variations were produced by the existence of a star spot (or star spots) in the analysis, we derived the system parameters and analyzed the 1995 and 1999 light curves by adjusting only the spot parameters. As the results, we interpreted that those light variations are produced by the simultaneous existence of a hot spot and a cool spot on the secondary. We could infer that the hot spot on the secondary is produced due to mass exchange between the components suggested by Lee (1999).http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2003/v20n2/OJOOBS_2003_v20n2_123.pdfCCD observationseclipsing binaryAB Andphotometric solutionsspots |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jae Woo Lee Chun-Hwey Kim Wonyong Han Ho Jin Kyu-Dong Oh |
spellingShingle |
Jae Woo Lee Chun-Hwey Kim Wonyong Han Ho Jin Kyu-Dong Oh PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE Journal of Astronomy and Space Sciences CCD observations eclipsing binary AB And photometric solutions spots |
author_facet |
Jae Woo Lee Chun-Hwey Kim Wonyong Han Ho Jin Kyu-Dong Oh |
author_sort |
Jae Woo Lee |
title |
PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE |
title_short |
PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE |
title_full |
PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE |
title_fullStr |
PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE |
title_full_unstemmed |
PHOTOMETRIC SOLUTIONS AND SPOT MODEL OF THE CONTACT BINARY AB ANDROMEDAE |
title_sort |
photometric solutions and spot model of the contact binary ab andromedae |
publisher |
Korean Space Science Society (KSSS) |
series |
Journal of Astronomy and Space Sciences |
issn |
2093-5587 2093-1409 |
publishDate |
2003-06-01 |
description |
We performed CCD photometric observations of the W-type contact binary AB And for 10 nights from November 1995 to December 1999 using the 61-cm reflector and BVR filters at Sobaeksan Optical Astronomy Observatory. From our observations, the seasonal light curves of AB And for 1995, 1996 and 1999 were completed and 8 new times of minimum light were determined. Newly obtained light curves show that strong light variations occurred in AB And during the past five years. We adopted the 1996 light curves as reference ones and obtained the photometric solutions of them with contact mode in the Wilson-Devinney binary code. Assuming such light variations were produced by the existence of a star spot (or star spots) in the analysis, we derived the system parameters and analyzed the 1995 and 1999 light curves by adjusting only the spot parameters. As the results, we interpreted that those light variations are produced by the simultaneous existence of a hot spot and a cool spot on the secondary. We could infer that the hot spot on the secondary is produced due to mass exchange between the components suggested by Lee (1999). |
topic |
CCD observations eclipsing binary AB And photometric solutions spots |
url |
http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2003/v20n2/OJOOBS_2003_v20n2_123.pdf |
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