Exploring Contact Binaries: Observational Analysis of Four W Uma Binaries Using Photometry and Spectroscopy
We present the multiband photometric and low-resolution spectroscopic analysis of four W Ursae Majoris eclipsing binaries (EWs)—J080510.1+141528 (hereinafter as J0805a), J080516.3+143138 (hereinafter as J0805b), J143358.7+053953 (hereinafter as J1433), and J143458.4+054143 (hereinafter as J1434). Th...
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2025-01-01
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| author | A. Panchal Y. C. Joshi V. Joshi A. Chakraborty |
| author_facet | A. Panchal Y. C. Joshi V. Joshi A. Chakraborty |
| author_sort | A. Panchal |
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| description | We present the multiband photometric and low-resolution spectroscopic analysis of four W Ursae Majoris eclipsing binaries (EWs)—J080510.1+141528 (hereinafter as J0805a), J080516.3+143138 (hereinafter as J0805b), J143358.7+053953 (hereinafter as J1433), and J143458.4+054143 (hereinafter as J1434). The multiband ground based photometric data are collected using the 1.3 m Devasthal Fast Optical Telescope, while we also make use of Transiting Exoplanet Survey Satellite (TESS) photometric observations. The spectroscopic analysis is based on the low-resolution observations by the 4 m Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). The ephemerides of these systems are updated using the photometric data from TESS and other photometric surveys. The system J0805b shows a secular change in the orbital period with a period change rate of 4.2 (±0.1) × 10 ^−7 days per year, while the orbital period change rate for J1433 is calculated as −1.1 (±0.1) × 10 ^−6 days per year. The mass-transfer rate for J0805b is found to be d M _1 / d t = −1.56(±0.07) × 10 ^−6 M _⊙ yr ^−1 and dM _1 / dt = −7.95(±0.87) × 10 ^−7 M _⊙ yr ^−1 for J1433. All the systems have inclination > 79 ^∘ except J1433, which has an inclination of 72 $\mathop{.}\limits^{\unicode{x000b0}}$ 8. The mass ratios (less massive to more massive component) for these targets are <0.5. All the systems except J0805b are A-subtype contact binaries. The absolute parameters of the systems are determined using Gaia DR3 parallax and reddening information. The LAMOST spectra are analyzed using the spectral subtraction technique. A small excess emission is detected for J1433 in H _α and H _β region. The systems are plotted on a Hertzsprung–Russell diagram and compared with previously studied systems. The mass ratio versus radius ratio relation is also investigated for these systems. |
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| spelling | doaj-art-862a242de661465684a90cb976fc75662025-08-20T02:22:19ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01986214110.3847/1538-4357/add34dExploring Contact Binaries: Observational Analysis of Four W Uma Binaries Using Photometry and SpectroscopyA. Panchal0https://orcid.org/0000-0002-1115-7033Y. C. Joshi1https://orcid.org/0000-0001-8657-1573V. Joshi2https://orcid.org/0000-0002-1457-4027A. Chakraborty3https://orcid.org/0000-0002-3815-8407Physical Research Laboratory (PRL) , Ahmedabad, Gujarat, India ; alaxenderpanchal@gmail.comAryabhatta Research Institute of Observational Sciences (ARIES) , Nainital, Uttrakhand, IndiaPhysical Research Laboratory (PRL) , Ahmedabad, Gujarat, India ; alaxenderpanchal@gmail.comPhysical Research Laboratory (PRL) , Ahmedabad, Gujarat, India ; alaxenderpanchal@gmail.comWe present the multiband photometric and low-resolution spectroscopic analysis of four W Ursae Majoris eclipsing binaries (EWs)—J080510.1+141528 (hereinafter as J0805a), J080516.3+143138 (hereinafter as J0805b), J143358.7+053953 (hereinafter as J1433), and J143458.4+054143 (hereinafter as J1434). The multiband ground based photometric data are collected using the 1.3 m Devasthal Fast Optical Telescope, while we also make use of Transiting Exoplanet Survey Satellite (TESS) photometric observations. The spectroscopic analysis is based on the low-resolution observations by the 4 m Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). The ephemerides of these systems are updated using the photometric data from TESS and other photometric surveys. The system J0805b shows a secular change in the orbital period with a period change rate of 4.2 (±0.1) × 10 ^−7 days per year, while the orbital period change rate for J1433 is calculated as −1.1 (±0.1) × 10 ^−6 days per year. The mass-transfer rate for J0805b is found to be d M _1 / d t = −1.56(±0.07) × 10 ^−6 M _⊙ yr ^−1 and dM _1 / dt = −7.95(±0.87) × 10 ^−7 M _⊙ yr ^−1 for J1433. All the systems have inclination > 79 ^∘ except J1433, which has an inclination of 72 $\mathop{.}\limits^{\unicode{x000b0}}$ 8. The mass ratios (less massive to more massive component) for these targets are <0.5. All the systems except J0805b are A-subtype contact binaries. The absolute parameters of the systems are determined using Gaia DR3 parallax and reddening information. The LAMOST spectra are analyzed using the spectral subtraction technique. A small excess emission is detected for J1433 in H _α and H _β region. The systems are plotted on a Hertzsprung–Russell diagram and compared with previously studied systems. The mass ratio versus radius ratio relation is also investigated for these systems.https://doi.org/10.3847/1538-4357/add34dContact binary starsEclipsing binary starsMulti-color photometryFundamental parameters of starsObservational astronomySpectroscopy |
| spellingShingle | A. Panchal Y. C. Joshi V. Joshi A. Chakraborty Exploring Contact Binaries: Observational Analysis of Four W Uma Binaries Using Photometry and Spectroscopy The Astrophysical Journal Contact binary stars Eclipsing binary stars Multi-color photometry Fundamental parameters of stars Observational astronomy Spectroscopy |
| title | Exploring Contact Binaries: Observational Analysis of Four W Uma Binaries Using Photometry and Spectroscopy |
| title_full | Exploring Contact Binaries: Observational Analysis of Four W Uma Binaries Using Photometry and Spectroscopy |
| title_fullStr | Exploring Contact Binaries: Observational Analysis of Four W Uma Binaries Using Photometry and Spectroscopy |
| title_full_unstemmed | Exploring Contact Binaries: Observational Analysis of Four W Uma Binaries Using Photometry and Spectroscopy |
| title_short | Exploring Contact Binaries: Observational Analysis of Four W Uma Binaries Using Photometry and Spectroscopy |
| title_sort | exploring contact binaries observational analysis of four w uma binaries using photometry and spectroscopy |
| topic | Contact binary stars Eclipsing binary stars Multi-color photometry Fundamental parameters of stars Observational astronomy Spectroscopy |
| url | https://doi.org/10.3847/1538-4357/add34d |
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