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The Solar Twin Planet Search IV. The Sun as a typical rotator and evidence for a new rotational braking law for Sun-like stars

dos Santos, Leonardo A.; Meléndez, J; do Nascimento Jr., José-Dias; Bedell, Megan; Ramírez, I; Bean, Jacob; Asplund, Martin; Spina, L; Dreizler, S; Alves-Brito, A; Casagrande, Luca

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Context. It is still unclear how common the Sun is when compared to other similar stars in regards to some of its physical properties, such as rotation. Considering that gyrochronology relations are widely used today to estimate ages of stars in the main sequence, and that the Sun is used to calibrate it, it is crucial to assess whether these procedures are acceptable. Aims. We analyze the rotational velocities, limited by the unknown rotation axis inclination angle, of an unprecedented large...[Show more]

dc.contributor.authordos Santos, Leonardo A.
dc.contributor.authorMeléndez, J
dc.contributor.authordo Nascimento Jr., José-Dias
dc.contributor.authorBedell, Megan
dc.contributor.authorRamírez, I
dc.contributor.authorBean, Jacob
dc.contributor.authorAsplund, Martin
dc.contributor.authorSpina, L
dc.contributor.authorDreizler, S
dc.contributor.authorAlves-Brito, A
dc.contributor.authorCasagrande, Luca
dc.date.accessioned2018-11-29T22:51:58Z
dc.date.available2018-11-29T22:51:58Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/152041
dc.description.abstractContext. It is still unclear how common the Sun is when compared to other similar stars in regards to some of its physical properties, such as rotation. Considering that gyrochronology relations are widely used today to estimate ages of stars in the main sequence, and that the Sun is used to calibrate it, it is crucial to assess whether these procedures are acceptable. Aims. We analyze the rotational velocities, limited by the unknown rotation axis inclination angle, of an unprecedented large sample of solar twins to study the rotational evolution of Sun-like stars, and assess whether the Sun is a typical rotator. Methods. We used high-resolution (R = 115 000) spectra obtained with the HARPS spectrograph and the 3.6 m telescope at La Silla Observatory. The projected rotational velocities for 81 solar twins were estimated by line profile fitting with synthetic spectra. Macroturbulence velocities were inferred from a prescription that accurately reflects their dependence with effective temperature and luminosity of the stars. Results. Our sample of solar twins include some spectroscopic binaries with enhanced rotational velocities, and we do not find any nonspectroscopic binaries with unusually high rotation velocities. We verified that the Sun does not have a peculiar rotation, but the solar twins exhibit rotational velocities that depart from the Skumanich relation. Conclusions. The Sun is a regular rotator when compared to solar twins with a similar age. Additionally, we obtain a rotational braking law that better describes the stars in our sample (v ∝ t-0.6) in contrast to previous, often-used scalings.
dc.format.mimetypeapplication/pdf
dc.publisherSpringer
dc.sourceAstronomy and Astrophysics
dc.titleThe Solar Twin Planet Search IV. The Sun as a typical rotator and evidence for a new rotational braking law for Sun-like stars
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume592
dc.date.issued2016
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationa383154xPUB4286
local.type.statusPublished Version
local.contributor.affiliationdos Santos, Leonardo A., Universidade de São Paulo
local.contributor.affiliationMeléndez, J, Universidade de São Paulo
local.contributor.affiliationdo Nascimento Jr., José-Dias, Universidade Federal do Rio Grande do Norte
local.contributor.affiliationBedell, Megan, University of Chicago
local.contributor.affiliationRamírez, I, University of Texas
local.contributor.affiliationBean, Jacob, University of Chicago
local.contributor.affiliationAsplund, Martin, College of Science, ANU
local.contributor.affiliationSpina, L, Universidade de São Paulo
local.contributor.affiliationDreizler, S, University of Gottingen
local.contributor.affiliationAlves-Brito, A, Universidade Federal do Rio Grande
local.contributor.affiliationCasagrande, Luca, College of Science, ANU
local.bibliographicCitation.issueA156
local.identifier.doi10.1051/0004-6361/201628558
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2018-11-29T07:42:26Z
local.identifier.scopusID2-s2.0-84984618232
local.identifier.thomsonID000384722600133
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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