Magnetic Fields of M Dwarfs from the Pleiades Open Cluster
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Wanderley, Fabio Cunha, Katia Kochukhov, Oleg Smith, Verne V. Souto, Diogo Cao, Lyra Covey, Kevin Majewski, Steven R. Martinez, Cintia Muirhead, Philip S. Pinsonneault, Marc Prieto, C. Allende Stassun, Keivan G. |
| author_facet | Wanderley, Fabio Cunha, Katia Kochukhov, Oleg Smith, Verne V. Souto, Diogo Cao, Lyra Covey, Kevin Majewski, Steven R. Martinez, Cintia Muirhead, Philip S. Pinsonneault, Marc Prieto, C. Allende Stassun, Keivan G. |
| contents | Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe I lines in the H-band. An MCMC methodology was employed to model magnetic filling factors using SDSS-IV APOGEE high-resolution spectra, along with the radiative transfer code SYNMAST, MARCS stellar atmosphere models, and the APOGEE DR17 spectral line list. There is a positive correlation between mean magnetic fields and stellar rotation, with slow-rotator stars (Rossby number, Ro$>$0.13) exhibiting a steeper slope than rapid-rotators (Ro$<$0.13). However, the latter sample still shows a positive trend between Ro and magnetic fields, which is given by $<$B$>$ = 1604 $\times$ Ro$^{-0.20}$. The derived stellar radii, when compared with physical isochrones, show that on average, our sample shows radius inflation, with median enhanced radii ranging from +3.0$\%$ to +7.0$\%$, depending on the model. There is a positive correlation between magnetic field strength and radius inflation, as well as with stellar spot coverage, correlations that together indicate that stellar spot-filling factors generated by strong magnetic fields might be the mechanism that drives radius inflation in these stars. We also compare our derived magnetic fields with chromospheric emission lines (H$α$, H$β$ and Ca II K), as well as with X-ray and H$α$ to bolometric luminosity ratios, and find that stars with higher chromospheric and coronal activity tend to be more magnetic. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_13757 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic Fields of M Dwarfs from the Pleiades Open Cluster Wanderley, Fabio Cunha, Katia Kochukhov, Oleg Smith, Verne V. Souto, Diogo Cao, Lyra Covey, Kevin Majewski, Steven R. Martinez, Cintia Muirhead, Philip S. Pinsonneault, Marc Prieto, C. Allende Stassun, Keivan G. Solar and Stellar Astrophysics Astrophysics of Galaxies Average magnetic field measurements are presented for 62 M-dwarf members of the Pleiades open cluster, derived from Zeeman-enhanced Fe I lines in the H-band. An MCMC methodology was employed to model magnetic filling factors using SDSS-IV APOGEE high-resolution spectra, along with the radiative transfer code SYNMAST, MARCS stellar atmosphere models, and the APOGEE DR17 spectral line list. There is a positive correlation between mean magnetic fields and stellar rotation, with slow-rotator stars (Rossby number, Ro$>$0.13) exhibiting a steeper slope than rapid-rotators (Ro$<$0.13). However, the latter sample still shows a positive trend between Ro and magnetic fields, which is given by $<$B$>$ = 1604 $\times$ Ro$^{-0.20}$. The derived stellar radii, when compared with physical isochrones, show that on average, our sample shows radius inflation, with median enhanced radii ranging from +3.0$\%$ to +7.0$\%$, depending on the model. There is a positive correlation between magnetic field strength and radius inflation, as well as with stellar spot coverage, correlations that together indicate that stellar spot-filling factors generated by strong magnetic fields might be the mechanism that drives radius inflation in these stars. We also compare our derived magnetic fields with chromospheric emission lines (H$α$, H$β$ and Ca II K), as well as with X-ray and H$α$ to bolometric luminosity ratios, and find that stars with higher chromospheric and coronal activity tend to be more magnetic. |
| title | Magnetic Fields of M Dwarfs from the Pleiades Open Cluster |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.13757 |