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THE EFFECT OF BINARITY ON STELLAR ROTATION- BEYOND THE REACH OF TIDES 1

Søren Meibom, Robert D. Mathieu, Keivan G. Stassun

Open publisher page 21 citations

Abstract

We present a comparison between the rotation period distributions of solartype single stars and primary stars in close binaries (0.1 AU � a � 5 AU) in the young ( ∼ 150 Myr) open cluster M35 (NGC2168). We find that the primary stars in the close binaries rotate faster than the single stars, on average. The differences in the means and medians between the period distributions are statistically significant at the 99.9 % level or higher. The faster rotation among the primary stars in close binaries is not due to tidal synchronization as tidally evolved stars are excluded from the comparison. We discuss this result in the context of different early-evolution accretion processes and star-disk interactions for single stars and stars in close binaries.

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What this paper is about

We present a comparison between the rotation period distributions of solartype single stars and primary stars in close binaries (0.1 AU � a � 5 AU) in the young ( ∼ 150 Myr) open cluster M35 (NGC2168). We find that the primary stars in the close binaries rotate faster than the single stars, on average. The differences in the means and medians between the period distributions are statistically significant at the 99.9 % level or higher. The faster rotation among the primary stars in close binaries is not due to tidal synchronization as tidally evolved stars are excluded from the comparison. We discuss this result in the context of different early-evolution accretion processes and star-disk interactions for single stars and stars in close binaries.

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Available abstract

We present a comparison between the rotation period distributions of solartype single stars and primary stars in close binaries (0.1 AU � a � 5 AU) in the young ( ∼ 150 Myr) open cluster M35 (NGC2168). We find that the primary stars in the close binaries rotate faster than the single stars, on average. The differences in the means and medians between the period distributions are statistically significant at the 99.9 % level or higher. The faster rotation among the primary stars in close binaries is not due to tidal synchronization as tidally evolved stars are excluded from the comparison. We discuss this result in the context of different early-evolution accretion processes and star-disk interactions for single stars and stars in close binaries.

Key concepts: Stars, Physics, Astrophysics, Open cluster, Rotation (mathematics), K-type main-sequence star, Context (archaeology), Blue straggler

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