Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185
We present an in-depth photometric and spectroscopic study of the contact binary KIC 7766185. Spectroscopic observations were conducted on the Mayall 4 m telescope at Kitt Peak National Observatory and used to extract radial velocities. Using the radial velocity measurements, Kepler photometry, and...
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IOP Publishing
2025-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/adf202 |
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| author | Conor M. Larsen Andrej Prša |
| author_facet | Conor M. Larsen Andrej Prša |
| author_sort | Conor M. Larsen |
| collection | DOAJ |
| description | We present an in-depth photometric and spectroscopic study of the contact binary KIC 7766185. Spectroscopic observations were conducted on the Mayall 4 m telescope at Kitt Peak National Observatory and used to extract radial velocities. Using the radial velocity measurements, Kepler photometry, and Gaia multicolor photometry, binary analysis was performed in PHOEBE to determine orbital and stellar parameters. The results classify KIC 7766185 as an A-type W UMa system and reveal one of the largest and most massive secondary stars in the sample of well studied W UMa systems. The two stars are in a shallow contact state, with a small fillout factor of 0.029 ± 0.002. Along with the binary analysis, we conduct a period study that reveals evidence for a cyclic variation in the eclipse timings. |
| format | Article |
| id | doaj-art-a7aad199fd2e43fda5548934ddc9b8dc |
| institution | DOAJ |
| issn | 1538-3881 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj-art-a7aad199fd2e43fda5548934ddc9b8dc2025-08-20T03:07:05ZengIOP PublishingThe Astronomical Journal1538-38812025-01-01170316710.3847/1538-3881/adf202Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185Conor M. Larsen0https://orcid.org/0000-0002-4524-9497Andrej Prša1https://orcid.org/0000-0002-1913-0281Department of Physics and Astronomy, University of Delaware , 217 Sharp Lab, Newark, DE 19716, USA ; cmlarsen@udel.eduDepartment of Astrophysics and Planetary Science, Villanova University , 800 E Lancaster Ave, Villanova, PA 19085, USAWe present an in-depth photometric and spectroscopic study of the contact binary KIC 7766185. Spectroscopic observations were conducted on the Mayall 4 m telescope at Kitt Peak National Observatory and used to extract radial velocities. Using the radial velocity measurements, Kepler photometry, and Gaia multicolor photometry, binary analysis was performed in PHOEBE to determine orbital and stellar parameters. The results classify KIC 7766185 as an A-type W UMa system and reveal one of the largest and most massive secondary stars in the sample of well studied W UMa systems. The two stars are in a shallow contact state, with a small fillout factor of 0.029 ± 0.002. Along with the binary analysis, we conduct a period study that reveals evidence for a cyclic variation in the eclipse timings.https://doi.org/10.3847/1538-3881/adf202Contact binary starsEclipsing binary starsStellar propertiesW Ursae Majoris variable stars |
| spellingShingle | Conor M. Larsen Andrej Prša Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185 The Astronomical Journal Contact binary stars Eclipsing binary stars Stellar properties W Ursae Majoris variable stars |
| title | Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185 |
| title_full | Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185 |
| title_fullStr | Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185 |
| title_full_unstemmed | Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185 |
| title_short | Binary Analysis and Period Study of the Long-period, High-mass-ratio Contact Binary KIC 7766185 |
| title_sort | binary analysis and period study of the long period high mass ratio contact binary kic 7766185 |
| topic | Contact binary stars Eclipsing binary stars Stellar properties W Ursae Majoris variable stars |
| url | https://doi.org/10.3847/1538-3881/adf202 |
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