Rediscussion of eclipsing binaries. Paper VII. Delta Scuti, gamma Doradus and tidally-perturbed pulsations in RR Lyncis. (arXiv:2109.10196v1 [astro-ph.SR])

Rediscussion of eclipsing binaries. Paper VII. Delta Scuti, gamma Doradus and tidally-perturbed pulsations in RR Lyncis. (arXiv:2109.10196v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Southworth_J/0/1/0/all/0/1">John Southworth</a>

RR Lyn is a detached eclipsing binary with a 9.95 d orbit containing two
A-stars: one metallic-lined and one possibly metal-poor. We use the light curve
from the TESS satellite and two sets of published radial velocity measurements
to determine the properties of the system to high precision. We find masses of
1.939 +/- 0.007 and 1.510 +/- 0.003 Msun, and radii of 2.564 +/- 0.019 and
1.613 +/- 0.013 Rsun. After adjusting published effective temperatures upwards
by 200 K we find a good agreement with theoretical models for a solar chemical
composition and an age of 1 Gyr, and a distance slightly shorter than expected
from the Gaia EDR3 parallax. The light curve of RR Lyn shows clear evidence for
pulsations. We measure 35 pulsation frequencies and attribute the higher
frequencies to delta Scuti-type pulsations, and the intermediate frequencies to
gamma Doradus-type pulsations (some of which may be tidally perturbed). The
lower frequencies may be tidally excited pulsations in RR Lyn or alternatively
of instrumental origin. Most or all of these pulsations are likely to arise in
the secondary star. RR Lyn is one of the few eclipsing binaries known to have
well-established properties and to exhibit multiple types of pulsations.

RR Lyn is a detached eclipsing binary with a 9.95 d orbit containing two
A-stars: one metallic-lined and one possibly metal-poor. We use the light curve
from the TESS satellite and two sets of published radial velocity measurements
to determine the properties of the system to high precision. We find masses of
1.939 +/- 0.007 and 1.510 +/- 0.003 Msun, and radii of 2.564 +/- 0.019 and
1.613 +/- 0.013 Rsun. After adjusting published effective temperatures upwards
by 200 K we find a good agreement with theoretical models for a solar chemical
composition and an age of 1 Gyr, and a distance slightly shorter than expected
from the Gaia EDR3 parallax. The light curve of RR Lyn shows clear evidence for
pulsations. We measure 35 pulsation frequencies and attribute the higher
frequencies to delta Scuti-type pulsations, and the intermediate frequencies to
gamma Doradus-type pulsations (some of which may be tidally perturbed). The
lower frequencies may be tidally excited pulsations in RR Lyn or alternatively
of instrumental origin. Most or all of these pulsations are likely to arise in
the secondary star. RR Lyn is one of the few eclipsing binaries known to have
well-established properties and to exhibit multiple types of pulsations.

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