TESS Observations of Seven Newly Identified High-amplitude δ Scuti Stars
We report seven newly identified high-amplitude δ Scuti (HADS) stars. Among them, two stars (TIC 30977864 and TIC 387379145) exhibit pure radial pulsation without the excitation of non-radial modes. TIC 30977864 is classified as a double-mode HADS star, while the other four stars potentially show tr...
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acf999 |
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| author | Chenglong Lv Ali Esamdin A. Hasanzadeh Shuguo Ma TaoZhi Yang Rivkat Karimov |
| author_facet | Chenglong Lv Ali Esamdin A. Hasanzadeh Shuguo Ma TaoZhi Yang Rivkat Karimov |
| author_sort | Chenglong Lv |
| collection | DOAJ |
| description | We report seven newly identified high-amplitude δ Scuti (HADS) stars. Among them, two stars (TIC 30977864 and TIC 387379145) exhibit pure radial pulsation without the excitation of non-radial modes. TIC 30977864 is classified as a double-mode HADS star, while the other four stars potentially show triple-mode HADS behavior. TIC 112682462 and TIC 255603395 closely resemble RR Lyrae stars based on their light curves, position in the period–luminosity diagram, and the period ratio diagram. However, without spectral observations, it is challenging to ascertain whether these two stars are HADS or RR Lyrae stars. TIC 281695001 exhibits a fundamental frequency amplitude smaller than that of the first overtone, suggesting the presence of intriguing phenomena that necessitate further analysis. We analyzed the relationship between metallicity and period using data provided by Netzel & Smolec. The metallicities of the 176 stars display a broad distribution ranging from −2.0 dex to 0.5 dex, with periods spanning 0.05 to 0.20 days. This random distribution of metallicities may contribute to the dispersion observed in the P1/P0 ratio. To derive more accurate conclusions, future spectroscopic observations of a larger sample of HADS stars are crucial. These observations will provide precise rotational velocities and more accurate determinations of metallicities. |
| first_indexed | 2024-03-09T10:39:45Z |
| format | Article |
| id | doaj.art-8eda69a3e2ba4865a0cd731e442c3933 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-09T10:39:45Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj.art-8eda69a3e2ba4865a0cd731e442c39332023-12-01T17:30:40ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195913310.3847/1538-4357/acf999TESS Observations of Seven Newly Identified High-amplitude δ Scuti StarsChenglong Lv0https://orcid.org/0000-0001-6354-1646Ali Esamdin1https://orcid.org/0000-0003-1845-4900A. Hasanzadeh2https://orcid.org/0000-0002-7286-1438Shuguo Ma3https://orcid.org/0000-0001-5066-5682TaoZhi Yang4https://orcid.org/0000-0002-1859-4949Rivkat Karimov5Xinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People's Republic of China ; aliyi@xao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of ChinaXinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People's Republic of China ; aliyi@xao.ac.cn; School of Astronomy and Space Science, University of Chinese Academy of Sciences , Beijing 100049, People's Republic of ChinaCentre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick , Coventry CV4 7AL, UK; Institute of Geophysics, University of Tehran , Tehran, IranKey Laboratory of Optical Astronomy, National Astronomical Observatories , Chinese Academy of Sciences, Beijing, 100012, People's Republic of ChinaMinistry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter , School of Physics, Xi’an Jiaotong University, Xi’an 710049, People's Republic of ChinaUlugh Beg Astronomical Institute, Uzbekistan Academy of Sciences , Tashkent 100052, UzbekistanWe report seven newly identified high-amplitude δ Scuti (HADS) stars. Among them, two stars (TIC 30977864 and TIC 387379145) exhibit pure radial pulsation without the excitation of non-radial modes. TIC 30977864 is classified as a double-mode HADS star, while the other four stars potentially show triple-mode HADS behavior. TIC 112682462 and TIC 255603395 closely resemble RR Lyrae stars based on their light curves, position in the period–luminosity diagram, and the period ratio diagram. However, without spectral observations, it is challenging to ascertain whether these two stars are HADS or RR Lyrae stars. TIC 281695001 exhibits a fundamental frequency amplitude smaller than that of the first overtone, suggesting the presence of intriguing phenomena that necessitate further analysis. We analyzed the relationship between metallicity and period using data provided by Netzel & Smolec. The metallicities of the 176 stars display a broad distribution ranging from −2.0 dex to 0.5 dex, with periods spanning 0.05 to 0.20 days. This random distribution of metallicities may contribute to the dispersion observed in the P1/P0 ratio. To derive more accurate conclusions, future spectroscopic observations of a larger sample of HADS stars are crucial. These observations will provide precise rotational velocities and more accurate determinations of metallicities.https://doi.org/10.3847/1538-4357/acf999Delta Scuti variable starsAsteroseismology |
| spellingShingle | Chenglong Lv Ali Esamdin A. Hasanzadeh Shuguo Ma TaoZhi Yang Rivkat Karimov TESS Observations of Seven Newly Identified High-amplitude δ Scuti Stars The Astrophysical Journal Delta Scuti variable stars Asteroseismology |
| title | TESS Observations of Seven Newly Identified High-amplitude δ Scuti Stars |
| title_full | TESS Observations of Seven Newly Identified High-amplitude δ Scuti Stars |
| title_fullStr | TESS Observations of Seven Newly Identified High-amplitude δ Scuti Stars |
| title_full_unstemmed | TESS Observations of Seven Newly Identified High-amplitude δ Scuti Stars |
| title_short | TESS Observations of Seven Newly Identified High-amplitude δ Scuti Stars |
| title_sort | tess observations of seven newly identified high amplitude δ scuti stars |
| topic | Delta Scuti variable stars Asteroseismology |
| url | https://doi.org/10.3847/1538-4357/acf999 |
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