Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III

Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III

We present newly observed BVRI CCD light curves for low mass ratio contact binaries, HN UMa and II UMa. The absolute dimensions of these objects were obtained by applying the Wilson-Devinney program to previously published spectroscopic analysis and to our observed photometric data. The evolutionary...

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Bibliographic Details
Main Authors: Woo-Baik Lee, Ho-il Kim, Young Woon Kang, Kyu-Dong Oh
Format: Article
Language:English
Published: Korean Space Science Society (KSSS) 2006-09-01
Series:Journal of Astronomy and Space Sciences
Subjects:
low mass ratio contact binary
binary solution
evolution of binary stars
Online Access:http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2006/v23n3/OJOOBS_2006_v23n3_189.pdf
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spelling doaj-7589b5b2cffa48738128a11ae3a9b93f2020-11-25T00:24:42ZengKorean Space Science Society (KSSS)Journal of Astronomy and Space Sciences2093-55872093-14092006-09-0123318919810.5140/JASS.2006.23.3.189Low Mass Ratio Contact Binary Systems HN UMa and II UMa - IIIWoo-Baik Lee0Ho-il Kim1Young Woon Kang2Kyu-Dong Oh3Korea Astronomy & Space Science Institute, Daejon 305-348, KoreaKorea Astronomy & Space Science Institute, Daejon 305-348, KoreaDepartment of Astronomy, Sejong University, Seoul 143-747, KoreaDepartment of Earth Science Education, Chonnam National University, Gwangju 500-757, KoreaWe present newly observed BVRI CCD light curves for low mass ratio contact binaries, HN UMa and II UMa. The absolute dimensions of these objects were obtained by applying the Wilson-Devinney program to previously published spectroscopic analysis and to our observed photometric data. The evolutionary status of all 21 low mass ratio contact binary system including HN UMa and II UMa was then considered. The secondaries of all low mass ratio contact binaries are located below the zero age main sequence in HR diagram. This phenomenon could be explained by mass loss from the secondary component in the low mass contact binary system because even small mass loss affects luminosity decrease in the low mass stars.http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2006/v23n3/OJOOBS_2006_v23n3_189.pdflow mass ratio contact binarybinary solutionevolution of binary stars
collection DOAJ
language English
format Article
sources DOAJ
author Woo-Baik Lee
Ho-il Kim
Young Woon Kang
Kyu-Dong Oh
spellingShingle Woo-Baik Lee
Ho-il Kim
Young Woon Kang
Kyu-Dong Oh
Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III
Journal of Astronomy and Space Sciences
low mass ratio contact binary
binary solution
evolution of binary stars
author_facet Woo-Baik Lee
Ho-il Kim
Young Woon Kang
Kyu-Dong Oh
author_sort Woo-Baik Lee
title Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III
title_short Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III
title_full Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III
title_fullStr Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III
title_full_unstemmed Low Mass Ratio Contact Binary Systems HN UMa and II UMa - III
title_sort low mass ratio contact binary systems hn uma and ii uma - iii
publisher Korean Space Science Society (KSSS)
series Journal of Astronomy and Space Sciences
issn 2093-5587
2093-1409
publishDate 2006-09-01
description We present newly observed BVRI CCD light curves for low mass ratio contact binaries, HN UMa and II UMa. The absolute dimensions of these objects were obtained by applying the Wilson-Devinney program to previously published spectroscopic analysis and to our observed photometric data. The evolutionary status of all 21 low mass ratio contact binary system including HN UMa and II UMa was then considered. The secondaries of all low mass ratio contact binaries are located below the zero age main sequence in HR diagram. This phenomenon could be explained by mass loss from the secondary component in the low mass contact binary system because even small mass loss affects luminosity decrease in the low mass stars.
topic low mass ratio contact binary
binary solution
evolution of binary stars
url http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2006/v23n3/OJOOBS_2006_v23n3_189.pdf
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AT youngwoonkang lowmassratiocontactbinarysystemshnumaandiiumaiii
AT kyudongoh lowmassratiocontactbinarysystemshnumaandiiumaiii
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