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The rotation-lithiu...
The rotation-lithium depletion correlation in the beta Pictoris association and the LDB age determination
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- Messina, S. (författare)
- INAF Catania Astrophys Observ, Via S Sofia 78, I-95123 Catania, Italy.
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- Lanzafame, A. C. (författare)
- INAF Catania Astrophys Observ, Via S Sofia 78, I-95123 Catania, Italy.;Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy.
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- Feiden, G. A. (författare)
- Uppsala universitet,Teoretisk astrofysik
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- Millward, M. (författare)
- York Creek Observ, Georgetown, Tas, Australia.
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- Desidera, S. (författare)
- INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
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- Buccino, A. (författare)
- Inst Astron & Fis Espacio IAFE CONICET, Buenos Aires, DF, Argentina.
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- Curtis, I. (författare)
- IAU Minor Planet Ctr Code D79, 2 Yandra St, Vale Pk, SA 5081, Australia.
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- Jofre, E. (författare)
- Observ Astron, Laprida 854,X5000BGR, Cordoba, Argentina.;Consejo Nacl Invest Cient & Tecn CONICET, RA-1418 Cordoba, Argentina.
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- Kehusmaa, P. (författare)
- Harlingten Atacama Observ, San Pedro De Atacama, Chile.
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- Medhi, B. J. (författare)
- Aryabhatta Res Inst Observat Sci, Manora Peak 263129, Nainital, India.
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- Monard, B. (författare)
- Klein Karoo Observ, Western Cape, South Africa.
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- Petrucci, R. (författare)
- Observ Astron, Laprida 854,X5000BGR, Cordoba, Argentina.;Consejo Nacl Invest Cient & Tecn CONICET, RA-1418 Cordoba, Argentina.
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INAF Catania Astrophys Observ, Via S Sofia 78, I-95123 Catania, Italy INAF Catania Astrophys Observ, Via S Sofia 78, I-95123 Catania, Italy.;Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy. (creator_code:org_t)
- 2016-11-25
- 2016
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 596
- Relaterad länk:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- Context. Evidence exists in the 125-Myr Pleiades cluster, and more recently in the 5-Myr NGC2264 cluster, to show that rotation plays a key role in lithium (Li) depletion processes among low-mass stars. Fast rotators appear to be less Li-depleted than equal-mass slow rotators. Aims. We intend to explore the existence of a Li depletion-rotation connection among the beta Pictoris members at an age of about 24 Myr, and to use this correlation either to confirm or to improve age estimates based on the lithium depletion boundary (LDB) modeling. Methods. We photometrically monitored all the known members of the beta Pictoris association with at least one lithium equivalent width (Li EW) measurement from the literature. Results. We measured the rotation periods of 30 members for the first time and retrieved the rotation periods for another 36 members from the literature, building a catalogue of 66 members with a measured rotation period and Li EW. Conclusions. We find that in the 0.3 < M < 0.8 M circle plus range, there is a strong correlation between rotation and Li EW. For higher mass stars, no significant correlation is found. For very low-mass stars in the Li depletion onset, at about 0.1 M circle plus, there are too few data to infer a significant correlation. The observed Li EWs are compared with those predicted by the Dartmouth stellar evolutionary models that incorporate the effects of magnetic fields. After decorrelating the Li EW from the rotation period, we find that the hot side of the LDB is well fitted by Li EW values that correspond to an age of 25 +/- 3 Myr, which is in good agreement with independent estimates from the literature.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: late-type
- stars: rotation
- starspots
- stars: individual: beta Pictoris association
- stars: activity
- stars: abundances
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- art (ämneskategori)
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- Av författaren/redakt...
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Messina, S.
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Lanzafame, A. C.
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Feiden, G. A.
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Millward, M.
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Desidera, S.
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Buccino, A.
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visa fler...
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Curtis, I.
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Jofre, E.
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Kehusmaa, P.
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Medhi, B. J.
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Monard, B.
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Petrucci, R.
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Uppsala universitet