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Magnetic and Rotational Evolution of rho CrB from Asteroseismology with TESS

Metcalfe, Travis S. (författare)
White Dwarf Res Corp, 9020 Brumm Trail, Golden, CO 80403 USA.;Space Sci Inst, 4765 Walnut St,Suite B, Boulder, CO 80301 USA.
van Saders, Jennifer L. (författare)
Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA.
Basu, Sarbani (författare)
Yale Univ, Dept Astron, POB 208101, New Haven, CT 06520 USA.
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Buzasi, Derek (författare)
Florida Gulf Coast Univ, Dept Chem & Phys, 10501 FGCU Blvd S, Ft Myers, FL 33965 USA.
Drake, Jeremy J. (författare)
Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
Egeland, Ricky (författare)
Natl Ctr Atmospher Res, High Altitude Observ, POB 3000, Boulder, CO 80307 USA.
Huber, Daniel (författare)
Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA.
Saar, Steven H. (författare)
Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
Stassun, Keivan G. (författare)
Vanderbilt Univ, Dept Phys & Astron, 6301 Stevenson Ctr Lane, Nashville, TN 37235 USA.
Ball, Warrick H. (författare)
Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
Campante, Tiago L. (författare)
Univ Porto, Inst Astrofis & Ciencias Espaco, Rua Estrelas, P-4150762 Porto, Portugal.;Univ Porto, Dept Fis & Astron, Rua Campo Alegre S-N, P-4169007 Porto, Portugal.
Finley, Adam J. (författare)
Univ Paris Saclay, Dept Astrophys AIM, F-91191 Gif Sur Yvette, France.;Univ Paris, CNRS, CEA, F-91191 Gif Sur Yvette, France.
Kochukhov, Oleg (författare)
Uppsala universitet,Observationell astrofysik
Mathur, Savita (författare)
Inst Astrofis Canarias, E-38205 Tenerife, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.
Reinhold, Timo (författare)
Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
See, Victor (författare)
Univ Exeter, Dept Phys & Astron, Stocker Rd, Exeter EX4 4QL, Devon, England.
Baliunas, Sallie (författare)
Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
Soon, Willie (författare)
Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
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White Dwarf Res Corp, 9020 Brumm Trail, Golden, CO 80403 USA;Space Sci Inst, 4765 Walnut St,Suite B, Boulder, CO 80301 USA. Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA. (creator_code:org_t)
2021-11-08
2021
Engelska.
Ingår i: Astrophysical Journal. - : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 921:2
Relaterad länk:
https://doi.org/10.3...
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http://arxiv.org/pdf...
https://urn.kb.se/re...
https://doi.org/10.3...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • During the first half of main-sequence lifetimes, the evolution of rotation and magnetic activity in solar-type stars appears to be strongly coupled. Recent observations suggest that rotation rates evolve much more slowly beyond middle age, while stellar activity continues to decline. We aim to characterize this midlife transition by combining archival stellar activity data from the Mount Wilson Observatory with asteroseismology from the Transiting Exoplanet Survey Satellite (TESS). For two stars on opposite sides of the transition (88 Leo and rho CrB), we independently assess the mean activity levels and rotation periods previously reported in the literature. For the less active star (rho CrB), we detect solar-like oscillations from TESS photometry, and we obtain precise stellar properties from asteroseismic modeling. We derive updated X-ray luminosities for both stars to estimate their mass-loss rates, and we use previously published constraints on magnetic morphology to model the evolutionary change in magnetic braking torque. We then attempt to match the observations with rotational evolution models, assuming either standard spin-down or weakened magnetic braking. We conclude that the asteroseismic age of rho CrB is consistent with the expected evolution of its mean activity level and that weakened braking models can more readily explain its relatively fast rotation rate. Future spectropolarimetric observations across a range of spectral types promise to further characterize the shift in magnetic morphology that apparently drives this midlife transition in solar-type stars.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

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