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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2404.17707 |
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| _version_ | 1866910426279706624 |
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| author | Cotton, Daniel V. Bailey, Jeremy Perkins, Jean Buzasi, Derek L. Boiko, Ievgeniia |
| author_facet | Cotton, Daniel V. Bailey, Jeremy Perkins, Jean Buzasi, Derek L. Boiko, Ievgeniia |
| contents | We write to report the discovery that Deneb is a large amplitude polarization variable. Over a ~400 d time span from August 2022 Deneb's polarization was typically around 3900 parts-per-million (ppm) in the SDSS g'-band. Yet, it varied by several hundred ppm in an irregular way on a timescale of weeks. The largest polarization change, amounting to 2500 ppm, occurred shortly after the last pulsation ``resumption'' event identified by Abt et al. (2023) in TESS photometry. The relationship between the observed polarization -- particularly corresponding to the resumption event -- and its brightness and H-alpha spectra suggests a mechanism involving density changes in its wind and/or extended atmosphere. Smaller effects due to pulsations are not ruled out and further study is recommended. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_17707 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Deneb is a Large Amplitude Polarimetric Variable Cotton, Daniel V. Bailey, Jeremy Perkins, Jean Buzasi, Derek L. Boiko, Ievgeniia Solar and Stellar Astrophysics We write to report the discovery that Deneb is a large amplitude polarization variable. Over a ~400 d time span from August 2022 Deneb's polarization was typically around 3900 parts-per-million (ppm) in the SDSS g'-band. Yet, it varied by several hundred ppm in an irregular way on a timescale of weeks. The largest polarization change, amounting to 2500 ppm, occurred shortly after the last pulsation ``resumption'' event identified by Abt et al. (2023) in TESS photometry. The relationship between the observed polarization -- particularly corresponding to the resumption event -- and its brightness and H-alpha spectra suggests a mechanism involving density changes in its wind and/or extended atmosphere. Smaller effects due to pulsations are not ruled out and further study is recommended. |
| title | Deneb is a Large Amplitude Polarimetric Variable |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2404.17707 |