Pulsating B stars in the Scorpius-Centaurus Association with TESS
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2022
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| author | Sharma, Awshesh N. Bedding, Timothy R. Saio, Hideyuki White, Timothy R. |
| author_facet | Sharma, Awshesh N. Bedding, Timothy R. Saio, Hideyuki White, Timothy R. |
| contents | We study 119 B stars located in the Scorpius-Centaurus Association using data from NASA's TESS Mission. We see pulsations in 81 stars (68%) across the full range of effective temperatures. In particular, we confirm previous reports of low-frequency pulsations in stars whose temperatures fall between the instability strips of SPB stars (slowly pulsating B stars) and $δ$ Scuti stars. By taking the stellar densities into account, we conclude that these cannot be p modes and confirm previous suggestions that these are probably rapidly-rotating SPB stars. We also confirm that they follow two period-luminosity relations that are consistent with prograde sectoral g modes that are dipole ($l=m=1$) and quadrupole ($l=m=2$), respectively. One of the stars ($ξ^2$ Cen) is a hybrid pulsator that shows regular spacings in both g and p modes. We confirm that $α$ Cru has low-amplitude p-mode pulsations, making it one of the brightest $β$ Cephei stars in the sky. We also find several interesting binaries, including a very short-period heartbeat star (HD 132094), a previously unknown eclipsing binary ($π$ Lup), and an eclipsing binary with high-amplitude tidally driven pulsations (HR 5846). The results clearly demonstrate the power of TESS for studying variability in stellar associations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2203_02582 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Pulsating B stars in the Scorpius-Centaurus Association with TESS Sharma, Awshesh N. Bedding, Timothy R. Saio, Hideyuki White, Timothy R. Solar and Stellar Astrophysics We study 119 B stars located in the Scorpius-Centaurus Association using data from NASA's TESS Mission. We see pulsations in 81 stars (68%) across the full range of effective temperatures. In particular, we confirm previous reports of low-frequency pulsations in stars whose temperatures fall between the instability strips of SPB stars (slowly pulsating B stars) and $δ$ Scuti stars. By taking the stellar densities into account, we conclude that these cannot be p modes and confirm previous suggestions that these are probably rapidly-rotating SPB stars. We also confirm that they follow two period-luminosity relations that are consistent with prograde sectoral g modes that are dipole ($l=m=1$) and quadrupole ($l=m=2$), respectively. One of the stars ($ξ^2$ Cen) is a hybrid pulsator that shows regular spacings in both g and p modes. We confirm that $α$ Cru has low-amplitude p-mode pulsations, making it one of the brightest $β$ Cephei stars in the sky. We also find several interesting binaries, including a very short-period heartbeat star (HD 132094), a previously unknown eclipsing binary ($π$ Lup), and an eclipsing binary with high-amplitude tidally driven pulsations (HR 5846). The results clearly demonstrate the power of TESS for studying variability in stellar associations. |
| title | Pulsating B stars in the Scorpius-Centaurus Association with TESS |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2203.02582 |