The visual binary AG Tri in \(\beta\) Pictoris association: can a debris disc cause very different rotation periods of its components?

Abstract

We measure the photometric rotation periods of the components of multiple systems in young stellar associations to investigate the causes of the observed rotation period dispersion. We present the case of the wide binary AG Tri in the 23-Myr young \(\beta\) Pictoris Association consisting of K4 + M1 dwarfs. Our multi-band, multi-season photometric monitoring allowed us to measure the rotation periods of both components \(P_{\mathrm{A}} = 12.4~\mbox{d}\) and \(P_{\mathrm{B}} = 4.66~\mbox{d}\), to detect a prominent magnetic activity in the photosphere, likely responsible for the measured radial velocity variations, and for the first time, a flare event on the M1 component AG Tri B. We investigate either the possibility that the faster rotating component may have suffered an enhanced primordial disc dispersal, starting its PMS spin-up earlier than the slower rotating component, or the possibility that the formation of a debris disc may have prevented AG Tri A from gaining part of the angular momentum from the accreting disc.

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Notes

  1. 1.

    IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of the Universities for Research in Astronomy, inc. (AURA) under cooperative agreement with the National Science Foundation.

  2. 2.

    Only during the first observation night we collected 70 consecutive frames in the V filter for a total of about 2.5 hr.

  3. 3.

    The kernel size was not computed appropriately for small \(v\sin{i}\) and could be also asymmetric.

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Acknowledgements

The extensive use of the SIMBAD and ADS databases, operated by the CDS center (Strasbourg, France), is gratefully acknowledged. We acknowledge funding from the LabEx OSUG@2020 that allowed purchasing the ProLine PL230 CCD imaging system installed on the 1.25-m telescope at CrAO. We warmly thank David Bradstreet for making available the Binary Maker V3 program. We give a special thank to the anonymous Referee for helpful comments that allowed us to improve the quality of the paper.

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Correspondence to Sergio Messina.

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Messina, S., Muro Serrano, M., Artemenko, S. et al. The visual binary AG Tri in \(\beta\) Pictoris association: can a debris disc cause very different rotation periods of its components?. Astrophys Space Sci 360, 51 (2015). https://doi.org/10.1007/s10509-015-2561-7

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Keywords

  • Stars: activity
  • Stars: low-mass
  • Stars: rotation
  • Stars: starspots
  • Stars: pre-main sequence: individual: AG Tri