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The Origin of Weake...
The Origin of Weakened Magnetic Braking in Old Solar Analogs
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- Metcalfe, Travis S. (författare)
- White Dwarf Res Corp, 9020 Brumm Trail, Golden, CO 80403 USA.
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- Finley, Adam J. (författare)
- Univ Paris Saclay, Dept Astrophys AIM, F-91191 Gif Sur Yvette, France.;Univ Paris Saclay, CEA, CNRS, F-91191 Gif Sur Yvette, France.
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- Kochukhov, Oleg (författare)
- Uppsala universitet,Institutionen för fysik och astronomi
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- See, Victor (författare)
- European Space Agcy ESA, European Space Res & Technol Ctr ESTEC, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands.
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- Ayres, Thomas R. (författare)
- Univ Colorado, Ctr Astrophys & Space Astron, 389 UCB, Boulder, CO 80309 USA.
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- Stassun, Keivan G. (författare)
- Vanderbilt Univ, Dept Phys & Astron, 6301 Stevenson Ctr Lane, Nashville, TN 37235 USA.
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- van Saders, Jennifer L. (författare)
- Univ Hawai, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA.
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- Clark, Catherine A. (författare)
- No Arizona Univ, 527 South Beaver St, Flagstaff, AZ 86011 USA.;Lowell Observ, 1400 West Mars Hill Rd, Flagstaff, AZ 86001 USA.
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- Godoy-Rivera, Diego (författare)
- Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA.;Inst Astrofis Canarias, E-38205 San Cristobal la Laguna, Spain.;Univ Laguna, Dept Astrofis, E-38206 San Cristobal la Laguna, Spain.
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- Ilyin, Ilya V. (författare)
- Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany.
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- Pinsonneault, Marc H. (författare)
- Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA.
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- Strassmeier, Klaus G. (författare)
- Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany.
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- Petit, Pascal (författare)
- Univ Toulouse, CNRS, CNES, 14 Ave Edouard Belin, F-31400 Toulouse, France.
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White Dwarf Res Corp, 9020 Brumm Trail, Golden, CO 80403 USA Univ Paris Saclay, Dept Astrophys AIM, F-91191 Gif Sur Yvette, France.;Univ Paris Saclay, CEA, CNRS, F-91191 Gif Sur Yvette, France. (creator_code:org_t)
- 2022-06-30
- 2022
- Engelska.
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Ingår i: Astrophysical Journal Letters. - : Institute of Physics Publishing (IOPP). - 2041-8205 .- 2041-8213. ; 933:1
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Abstract
Ämnesord
Stäng
- The rotation rates of main-sequence stars slow over time as they gradually lose angular momentum to their magnetized stellar winds. The rate of angular momentum loss depends on the strength and morphology of the magnetic field, the mass-loss rate, and the stellar rotation period, mass, and radius. Previous observations suggested a shift in magnetic morphology between two F-type stars with similar rotation rates but very different ages (88 Leo and rho CrB). In this Letter, we identify a comparable transition in an evolutionary sequence of solar analogs with ages between 2-7 Gyr. We present new spectropolarimetry of 18 Sco and 16 Cyg A and B from the Large Binocular Telescope, and we reanalyze previously published Zeeman Doppler images of HD 76151 and 18 Sco, providing additional constraints on the nature and timing of this transition. We combine archival X-ray observations with updated distances from Gaia to estimate mass-loss rates, and we adopt precise stellar properties from asteroseismology and other sources. We then calculate the wind braking torque for each star in the evolutionary sequence, demonstrating that the rate of angular momentum loss drops by more than an order of magnitude between the ages of HD 76151 and 18 Sco (2.6-3.7 Gyr) and continues to decrease modestly to the age of 16 Cyg A and B (7 Gyr). We suggest that this magnetic transition may represent a disruption of the global dynamo arising from weaker differential rotation, and we outline plans to probe this phenomenon in additional stars spanning a wide range of spectral types.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (ämneskategori)
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Metcalfe, Travis ...
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Finley, Adam J.
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Kochukhov, Oleg
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See, Victor
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Ayres, Thomas R.
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Stassun, Keivan ...
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visa fler...
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van Saders, Jenn ...
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Clark, Catherine ...
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Godoy-Rivera, Di ...
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Ilyin, Ilya V.
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Pinsonneault, Ma ...
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Strassmeier, Kla ...
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Petit, Pascal
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