The main-sequence rotation-colour relation in the coma berenices open cluster

A. Collier Cameron, V. A. Davidson, L. Hebb, G. Skinner, D. R. Anderson, D. J. Christian, W. I. Clarkson, B. Enoch, J. Irwin, Y. Joshi, C. A. Haswell, C. Hellier, K. D. Horne, S. R. Kane, T. A. Lister, P. F L Maxted, A. J. Norton, N. Parley, D. Pollacco, R. RyansA. Scholz, I. Skillen, B. Smalley, R. A. Street, R. G. West, D. M. Wilson, P. J. Wheatley

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

We present the results of a photometric survey of rotation rates in the Coma Berenices (Melotte 111) open cluster, using data obtained as part of the SuperWASP exoplanetary transit-search programme. The goal of the Coma survey was to measure precise rotation periods for main-sequence F, G and K dwarfs in this intermediate-age (∼600 Myr) cluster, and to determine the extent to which magnetic braking has caused the stellar spin periods to converge. We find a tight, almost linear relationship between rotation period and J - K colour with an rms scatter of only 2 per cent. The relation is similar to that seen among F, G and K stars in the Hyades. Such strong convergence can only be explained if angular momentum is not at present being transferred from a reservoir in the deep stellar interiors to the surface layers. We conclude that the coupling time-scale for angular momentum transport from a rapidly spinning radiative core to the outer convective zone must be substantially shorter than the cluster age, and that from the age of Coma onwards stars rotate effectively as solid bodies. The existence of a tight relationship between stellar mass and rotation period at a given age supports the use of stellar rotation period as an age indicator in F, G and K stars of Hyades age and older. We demonstrate that individual stellar ages can be determined within the Coma population with an internal precision of the order of 9 per cent (rms), using a standard magnetic braking law in which rotation period increases with the square root of stellar age. We find that a slight modification to the magnetic-braking power law, P ∝ t0.56, yields rotational and asteroseismological ages in good agreement for the Sun and other stars of solar age for which p-mode studies and photometric rotation periods have been published.

Original languageEnglish
Pages (from-to)451-462
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume400
Issue number1
DOIs
Publication statusPublished - 1 Nov 2009
Externally publishedYes

Fingerprint

open clusters
coma
braking
color
G stars
F stars
K stars
stellar rotation
angular momentum
stellar interiors
stars
transit
stellar mass
metal spinning
surface layers
sun
surface layer
power law
timescale

Keywords

  • Methods: Data analysis
  • Open clusters and associations: Individual: Melotte 111
  • Stars: Activity
  • Stars: Rotation
  • Techniques: Photometric

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Collier Cameron, A., Davidson, V. A., Hebb, L., Skinner, G., Anderson, D. R., Christian, D. J., ... Wheatley, P. J. (2009). The main-sequence rotation-colour relation in the coma berenices open cluster. Monthly Notices of the Royal Astronomical Society, 400(1), 451-462. https://doi.org/10.1111/j.1365-2966.2009.15476.x

The main-sequence rotation-colour relation in the coma berenices open cluster. / Collier Cameron, A.; Davidson, V. A.; Hebb, L.; Skinner, G.; Anderson, D. R.; Christian, D. J.; Clarkson, W. I.; Enoch, B.; Irwin, J.; Joshi, Y.; Haswell, C. A.; Hellier, C.; Horne, K. D.; Kane, S. R.; Lister, T. A.; Maxted, P. F L; Norton, A. J.; Parley, N.; Pollacco, D.; Ryans, R.; Scholz, A.; Skillen, I.; Smalley, B.; Street, R. A.; West, R. G.; Wilson, D. M.; Wheatley, P. J.

In: Monthly Notices of the Royal Astronomical Society, Vol. 400, No. 1, 01.11.2009, p. 451-462.

Research output: Contribution to journalArticle

Collier Cameron, A, Davidson, VA, Hebb, L, Skinner, G, Anderson, DR, Christian, DJ, Clarkson, WI, Enoch, B, Irwin, J, Joshi, Y, Haswell, CA, Hellier, C, Horne, KD, Kane, SR, Lister, TA, Maxted, PFL, Norton, AJ, Parley, N, Pollacco, D, Ryans, R, Scholz, A, Skillen, I, Smalley, B, Street, RA, West, RG, Wilson, DM & Wheatley, PJ 2009, 'The main-sequence rotation-colour relation in the coma berenices open cluster', Monthly Notices of the Royal Astronomical Society, vol. 400, no. 1, pp. 451-462. https://doi.org/10.1111/j.1365-2966.2009.15476.x
Collier Cameron, A. ; Davidson, V. A. ; Hebb, L. ; Skinner, G. ; Anderson, D. R. ; Christian, D. J. ; Clarkson, W. I. ; Enoch, B. ; Irwin, J. ; Joshi, Y. ; Haswell, C. A. ; Hellier, C. ; Horne, K. D. ; Kane, S. R. ; Lister, T. A. ; Maxted, P. F L ; Norton, A. J. ; Parley, N. ; Pollacco, D. ; Ryans, R. ; Scholz, A. ; Skillen, I. ; Smalley, B. ; Street, R. A. ; West, R. G. ; Wilson, D. M. ; Wheatley, P. J. / The main-sequence rotation-colour relation in the coma berenices open cluster. In: Monthly Notices of the Royal Astronomical Society. 2009 ; Vol. 400, No. 1. pp. 451-462.
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T1 - The main-sequence rotation-colour relation in the coma berenices open cluster

AU - Collier Cameron, A.

AU - Davidson, V. A.

AU - Hebb, L.

AU - Skinner, G.

AU - Anderson, D. R.

AU - Christian, D. J.

AU - Clarkson, W. I.

AU - Enoch, B.

AU - Irwin, J.

AU - Joshi, Y.

AU - Haswell, C. A.

AU - Hellier, C.

AU - Horne, K. D.

AU - Kane, S. R.

AU - Lister, T. A.

AU - Maxted, P. F L

AU - Norton, A. J.

AU - Parley, N.

AU - Pollacco, D.

AU - Ryans, R.

AU - Scholz, A.

AU - Skillen, I.

AU - Smalley, B.

AU - Street, R. A.

AU - West, R. G.

AU - Wilson, D. M.

AU - Wheatley, P. J.

PY - 2009/11/1

Y1 - 2009/11/1

N2 - We present the results of a photometric survey of rotation rates in the Coma Berenices (Melotte 111) open cluster, using data obtained as part of the SuperWASP exoplanetary transit-search programme. The goal of the Coma survey was to measure precise rotation periods for main-sequence F, G and K dwarfs in this intermediate-age (∼600 Myr) cluster, and to determine the extent to which magnetic braking has caused the stellar spin periods to converge. We find a tight, almost linear relationship between rotation period and J - K colour with an rms scatter of only 2 per cent. The relation is similar to that seen among F, G and K stars in the Hyades. Such strong convergence can only be explained if angular momentum is not at present being transferred from a reservoir in the deep stellar interiors to the surface layers. We conclude that the coupling time-scale for angular momentum transport from a rapidly spinning radiative core to the outer convective zone must be substantially shorter than the cluster age, and that from the age of Coma onwards stars rotate effectively as solid bodies. The existence of a tight relationship between stellar mass and rotation period at a given age supports the use of stellar rotation period as an age indicator in F, G and K stars of Hyades age and older. We demonstrate that individual stellar ages can be determined within the Coma population with an internal precision of the order of 9 per cent (rms), using a standard magnetic braking law in which rotation period increases with the square root of stellar age. We find that a slight modification to the magnetic-braking power law, P ∝ t0.56, yields rotational and asteroseismological ages in good agreement for the Sun and other stars of solar age for which p-mode studies and photometric rotation periods have been published.

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KW - Methods: Data analysis

KW - Open clusters and associations: Individual: Melotte 111

KW - Stars: Activity

KW - Stars: Rotation

KW - Techniques: Photometric

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