Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni
Harmonics are quite common in pulsating stars. They are always considered to mimic the behaviors of their independent parent pulsation modes, and are not taken for key information in asteroseismology. Here, we report an SX Phoenicis star XX Cygni, whose periodogram is dominated by the fundamental fr...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/acda2b |
| _version_ | 1797699440549560320 |
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| author | Jia-Shu Niu Yue Liu Hui-Fang Xue |
| author_facet | Jia-Shu Niu Yue Liu Hui-Fang Xue |
| author_sort | Jia-Shu Niu |
| collection | DOAJ |
| description | Harmonics are quite common in pulsating stars. They are always considered to mimic the behaviors of their independent parent pulsation modes, and are not taken for key information in asteroseismology. Here, we report an SX Phoenicis star XX Cygni, whose periodogram is dominated by the fundamental frequency f _0 = 7.41481 ± 0.00004 c day ^−1 and its 19 harmonics. According to the analysis of the archival data from the Transiting Exoplanet Survey Satellite (TESS), we find that both the amplitudes and frequencies of the fundamental mode and the harmonics vary within TESS Sectors 14–17 and 54–57, which might be caused by the contamination of neighboring stars. What is more interesting is that the harmonics show significantly uncorrelated amplitude and frequency variations over time. Some possible origins and interesting issues are proposed to scheme further research of this hidden corner in current asteroseismology. |
| first_indexed | 2024-03-12T04:08:10Z |
| format | Article |
| id | doaj.art-b51e3503e25e4dca8fdf38c31e312e3e |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T04:08:10Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-b51e3503e25e4dca8fdf38c31e312e3e2023-09-03T11:12:13ZengIOP PublishingThe Astronomical Journal1538-38812023-01-0116624310.3847/1538-3881/acda2bUncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX CygniJia-Shu Niu0https://orcid.org/0000-0001-5232-9500Yue Liu1Hui-Fang Xue2https://orcid.org/0000-0001-6027-4562Institute of Theoretical Physics, Shanxi University , Taiyuan 030006, People's Republic of China ; jsniu@sxu.edu.cn, hfxue@tynu.edu.cn; State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University , Taiyuan 030006, People's Republic of ChinaInstitute of Theoretical Physics, Shanxi University , Taiyuan 030006, People's Republic of China ; jsniu@sxu.edu.cn, hfxue@tynu.edu.cnDepartment of Physics, Taiyuan Normal University , Jinzhong 030619, People’s Republic of China; Institute of Computational and Applied Physics, Taiyuan Normal University , Jinzhong 030619, People's Republic of ChinaHarmonics are quite common in pulsating stars. They are always considered to mimic the behaviors of their independent parent pulsation modes, and are not taken for key information in asteroseismology. Here, we report an SX Phoenicis star XX Cygni, whose periodogram is dominated by the fundamental frequency f _0 = 7.41481 ± 0.00004 c day ^−1 and its 19 harmonics. According to the analysis of the archival data from the Transiting Exoplanet Survey Satellite (TESS), we find that both the amplitudes and frequencies of the fundamental mode and the harmonics vary within TESS Sectors 14–17 and 54–57, which might be caused by the contamination of neighboring stars. What is more interesting is that the harmonics show significantly uncorrelated amplitude and frequency variations over time. Some possible origins and interesting issues are proposed to scheme further research of this hidden corner in current asteroseismology.https://doi.org/10.3847/1538-3881/acda2bPulsating variable starsStellar pulsationsSX Phoenicis variable stars |
| spellingShingle | Jia-Shu Niu Yue Liu Hui-Fang Xue Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni The Astronomical Journal Pulsating variable stars Stellar pulsations SX Phoenicis variable stars |
| title | Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni |
| title_full | Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni |
| title_fullStr | Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni |
| title_full_unstemmed | Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni |
| title_short | Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni |
| title_sort | uncorrelated amplitude and frequency variations of the harmonics in sx phoenicis star xx cygni |
| topic | Pulsating variable stars Stellar pulsations SX Phoenicis variable stars |
| url | https://doi.org/10.3847/1538-3881/acda2b |
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