Transitory tidal heating and its impact on cluster isochrones
arxiv(2024)
摘要
The kinetic energy in tidal flows, when converted into heat, can affect the
internal structure of a star and shift its location on a color-magnitude
diagram from that of standard models. In this paper we explore the impact of
injecting heat into stars with masses near the main sequence turnoff mass (1.26
M_⊙) of the open cluster M67. The heating rate is obtained from the tidal
shear energy dissipation rate which is calculated from first principles by
simultaneously solving the equations that describe orbital motion and the
response of a star's layers to the gravitational, Coriolis, centrifugal, gas
pressure and viscous forces. The stellar structure models are computed with
MESA. We focus on the effects of injecting heat in pulses lasting 0.01 Gyr, a
timeframe consistent with the synchonization timescale in binary systems. We
find that the location of the tidally perturbed stars in the M67
color-magnitude diagram is shifted to significantly higher luminosities and
effective temperatures than predicted by the standard model isochrone and
include locations corresponding to some of the Blue Straggler Stars. Because
tidal heating takes energy from the orbit causing it to shrink, Blue Straggler
Stars could be merger or mass-transfer progenitors as well as products of these
processes.
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