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...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
The Korean Space Science Society
2006-09-01
|
| Series: | Journal of Astronomy and Space Sciences |
| Subjects: | |
| Online Access: | http://ocean.kisti.re.kr/downfile/volume/kosss/OJOOBS/2006/v23n3/OJOOBS_2006_v23n3_189.pdf |
| _version_ | 1797370432416907264 |
|---|---|
| author | Woo-Baik Lee Ho-il Kim Young Woon Kang Kyu-Dong Oh |
| author_facet | Woo-Baik Lee Ho-il Kim Young Woon Kang Kyu-Dong Oh |
| author_sort | Woo-Baik Lee |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-08T18:02:29Z |
| format | Article |
| id | doaj.art-7589b5b2cffa48738128a11ae3a9b93f |
| institution | Directory Open Access Journal |
| issn | 2093-5587 2093-1409 |
| language | English |
| last_indexed | 2024-03-08T18:02:29Z |
| publishDate | 2006-09-01 |
| publisher | The Korean Space Science Society |
| record_format | Article |
| series | Journal of Astronomy and Space Sciences |
| spelling | doaj.art-7589b5b2cffa48738128a11ae3a9b93f2024-01-02T00:34:37ZengThe Korean Space Science SocietyJournal 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 |
| 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 |
| title | 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_short | 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 |
| 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 |
| work_keys_str_mv | AT woobaiklee lowmassratiocontactbinarysystemshnumaandiiumaiii AT hoilkim lowmassratiocontactbinarysystemshnumaandiiumaiii AT youngwoonkang lowmassratiocontactbinarysystemshnumaandiiumaiii AT kyudongoh lowmassratiocontactbinarysystemshnumaandiiumaiii |