Modulation of the Blazhko Cycle in LS Her
We present analysis of the RR Lyrae star, LS Her, and confirm the previously reported modulation to its Blazhko cycles. We performed Fourier analysis on two sectors (Sector 24 and 25) of data from the Transiting Exoplanet Survey Satellite (TESS) spanning 53 days. We find LS Her to have a primary pul...
| 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/acc4ba |
| _version_ | 1797695780282171392 |
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| author | Ronald Wilhelm Kenneth Carrell Hannah H. Means Adam Popowicz Krzysztof Bernacki Mariusz Frąckiewicz Marek Szczepański Adam Dustor Jaylon Lockett Jill Taylor Stasha Youngquist |
| author_facet | Ronald Wilhelm Kenneth Carrell Hannah H. Means Adam Popowicz Krzysztof Bernacki Mariusz Frąckiewicz Marek Szczepański Adam Dustor Jaylon Lockett Jill Taylor Stasha Youngquist |
| author_sort | Ronald Wilhelm |
| collection | DOAJ |
| description | We present analysis of the RR Lyrae star, LS Her, and confirm the previously reported modulation to its Blazhko cycles. We performed Fourier analysis on two sectors (Sector 24 and 25) of data from the Transiting Exoplanet Survey Satellite (TESS) spanning 53 days. We find LS Her to have a primary pulsation period of 0.2308 day and a Blazhko period of 12.7 days in keeping with previously reported results. We also identified sideband frequencies around the Blazhko multiplets suggesting the Blazhko cycle is modulated on a timescale of 112 days. Analysis of the Blazhko effect using the TESS data clearly shows a changing amplitude and phase throughout the four Blazhko cycles. We compared our modeled results, which were based on our TESS frequency analysis, to TESS data (Sector 51) taken ∼700 days later and found our modulation model was not a good representation of the data. We then coupled our TESS analysis with the modulation frequency results from Wils et al. and found excellent agreement with the Sector 51 data. To further test this result we obtained ground-based, V -magnitude observations of LS Her in the summer of 2022. This data also showed excellent agreement with our coupled modulation model. We have verified that LS Her is a Blazhko star with a modulated Blazhko period of 109 days, stability over the 862 days of observations, and possible stability lasting over 15 yr. We discuss the ramifications of the modulation for other Blazhko stars that show Blazhko effect changes over time. |
| first_indexed | 2024-03-12T03:17:09Z |
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| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T03:17:09Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-8f7b3d6264fc4449bb746a46cfd8383b2023-09-03T14:08:30ZengIOP PublishingThe Astronomical Journal1538-38812023-01-01165519410.3847/1538-3881/acc4baModulation of the Blazhko Cycle in LS HerRonald Wilhelm0https://orcid.org/0000-0002-4792-7722Kenneth Carrell1https://orcid.org/0000-0002-6307-992XHannah H. Means2Adam Popowicz3https://orcid.org/0000-0003-3184-5228Krzysztof Bernacki4https://orcid.org/0000-0003-4647-7114Mariusz Frąckiewicz5https://orcid.org/0000-0002-3147-2348Marek Szczepański6https://orcid.org/0000-0003-1501-2154Adam Dustor7https://orcid.org/0000-0001-5516-9733Jaylon Lockett8Jill Taylor9Stasha Youngquist10Department of Physics & Astronomy, University of Kentucky , 177 Chem.-Phys. Building, 505 Rose Street, Lexington, KY 40506, USA ; ron.wilhelm@uky.eduPhysics & Geosciences, Angelo State University , 2601 W. Avenue N, San Angelo, TX 76909, USAPhysics & Astronomy, Bowling Green State University , Bowling Green, OH 43403, USADepartment of Electronics, Electrical Engineering, & Microelectronics, Silesian University of Technology , Akademicka 16, 44-100 Gliwice, PolandDepartment of Electronics, Electrical Engineering, & Microelectronics, Silesian University of Technology , Akademicka 16, 44-100 Gliwice, PolandDepartment of Data Science & Engineering, Silesian University of Technology , Akademicka 16, 44-100 Gliwice, PolandDepartment of Data Science & Engineering, Silesian University of Technology , Akademicka 16, 44-100 Gliwice, PolandDepartment of Telecommunications & Teleinformatics, Silesian University of Technology , Akademicka 16, 44-100 Gliwice, PolandPhysics & Geosciences, Angelo State University , 2601 W. Avenue N, San Angelo, TX 76909, USAPhysics & Geosciences, Angelo State University , 2601 W. Avenue N, San Angelo, TX 76909, USAPhysics & Geosciences, Angelo State University , 2601 W. Avenue N, San Angelo, TX 76909, USAWe present analysis of the RR Lyrae star, LS Her, and confirm the previously reported modulation to its Blazhko cycles. We performed Fourier analysis on two sectors (Sector 24 and 25) of data from the Transiting Exoplanet Survey Satellite (TESS) spanning 53 days. We find LS Her to have a primary pulsation period of 0.2308 day and a Blazhko period of 12.7 days in keeping with previously reported results. We also identified sideband frequencies around the Blazhko multiplets suggesting the Blazhko cycle is modulated on a timescale of 112 days. Analysis of the Blazhko effect using the TESS data clearly shows a changing amplitude and phase throughout the four Blazhko cycles. We compared our modeled results, which were based on our TESS frequency analysis, to TESS data (Sector 51) taken ∼700 days later and found our modulation model was not a good representation of the data. We then coupled our TESS analysis with the modulation frequency results from Wils et al. and found excellent agreement with the Sector 51 data. To further test this result we obtained ground-based, V -magnitude observations of LS Her in the summer of 2022. This data also showed excellent agreement with our coupled modulation model. We have verified that LS Her is a Blazhko star with a modulated Blazhko period of 109 days, stability over the 862 days of observations, and possible stability lasting over 15 yr. We discuss the ramifications of the modulation for other Blazhko stars that show Blazhko effect changes over time.https://doi.org/10.3847/1538-3881/acc4baRR Lyrae variable starsRRc variable starsBlazhko effect |
| spellingShingle | Ronald Wilhelm Kenneth Carrell Hannah H. Means Adam Popowicz Krzysztof Bernacki Mariusz Frąckiewicz Marek Szczepański Adam Dustor Jaylon Lockett Jill Taylor Stasha Youngquist Modulation of the Blazhko Cycle in LS Her The Astronomical Journal RR Lyrae variable stars RRc variable stars Blazhko effect |
| title | Modulation of the Blazhko Cycle in LS Her |
| title_full | Modulation of the Blazhko Cycle in LS Her |
| title_fullStr | Modulation of the Blazhko Cycle in LS Her |
| title_full_unstemmed | Modulation of the Blazhko Cycle in LS Her |
| title_short | Modulation of the Blazhko Cycle in LS Her |
| title_sort | modulation of the blazhko cycle in ls her |
| topic | RR Lyrae variable stars RRc variable stars Blazhko effect |
| url | https://doi.org/10.3847/1538-3881/acc4ba |
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