The beta Pictoris association low-mass members: membership assessment, rotation period distribution, and dependence on multiplicity

Abstract

Low-mass members of young stellar associations exhibit a wide spread of rotation periods. Such a spread originates from distributions of masses and initial rotation periods. However, multiplicity can also play a significant role. We investigate the role played by physical companions in shortening the primordial disc lifetime. We have compiled the most extensive list of low-mass members of the young 25-Myr beta Pictoris association. We have measured the rotation periods of about all members and used updated UVWXYZ components to assess their membership. We built the rotation period distribution distinguishing between bona fide members and candidate members and according to their multiplicity status. We found that single stars and components of multiple systems in wide orbits (>80 AU) have rotation periods that exhibit a well defined sequence arising from mass distribution. All components of multiple systems in close orbits (<80 AU) have rotation periods significantly shorter than their equal-mass single counterparts. A comparison with the younger 13 Myr h Per cluster and with the older 40-Myr open clusters/stellar associations NGC2547, IC2391, Argus, and IC2602 and the 130-Myr Pleiades shows that whereas the evolution of F-G stars is well reproduced by angular momentum evolution models, this is not the case for the slow K and early-M stars. Finally, we found that the amplitude of their light curves is correlated neither with rotation nor with mass. Once single stars and wide components of multiple systems are separated from close components of multiple systems, the rotation period distributions exhibit a well defined dependence on mass that allows to make a meaningful comparison with similar distributions of either younger or older associations/clusters. Such cleaned distributions allow to use the stellar rotation period as age indicator, meaningfully for F and G type stars.

20 pages, 9 figures, 4 tables; accepted by Astronomy and Astrophysics

References in corpus (14)

• The first WASP public data release
• Improved angular momentum evolution model for solar-like stars II. Exploring the mass dependence
• BANYAN. IV. Fundamental parameters of low-mass star candidates in nearby young stellar kinematic groups - Isochronal Age determination using Magnetic evolutionary models
• Fitting the young main-sequence; distances, ages and age spreads
• The VLT/NaCo Large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits: I- Sample definition and characterization
• The dispersal of protoplanetary disks around binary stars
• The Monitor project: Rotation of low-mass stars in the open cluster NGC 2547
• The rotation - Lithium depletion correlation in the beta Pictoris association and LDB age determination
• Search for associations containing young stars (SACY). V. Is multiplicity universal? Tight multiple systems
• Nearby young stars selected by proper motion. I. Four new members of the Beta Pictoris moving group from the Tycho-2 catalog
• `Tail-end' Bondi-Hoyle accretion in young star clusters: Implications for disks, planets, and stars
• The Effect of Binarity on Stellar Rotation - Beyond the Reach of Tides
• The beta Pictoris association: Catalog of photometric rotational periods of low-mass members and candidate members
• The evolution of accretion in young stellar objects: Strong accretors at 3 - 10 Myr

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