Opened the first “one-sided” throbbing star

With the help of the TESS space telescope, astronomers have discovered
the first example of stars, the axis of which is tilted much ripple due to
tidal interactions with another star in a binary system. Also
one side of the surface oscillations are much stronger than
opposite, and other such objects are not yet registered, write the authors in the journal
Nature Astronomy.

The stars are the main type studied astronomy objects.
Much of today’s understanding of the Universe is directly connected
with the study of the properties of stars. On the one hand this is due to the large number and
a variety of bodies, but of their relative simplicity with the physical
point of view, which allows you to build a detailed theoretical model.

Two main methods allow us to compare theory with
observations with high accuracy: an analysis of light eclipsing and double
astroseismology. The first will allow on the basis of the dependence of flow of time
(light curve) to determine the global properties of stars such as mass and
radius, and the second is to learn about the internal structure through the study of their
hesitation. A combination of these methods may be more productive than
the application separately, but suitable sources are rare.

Astronomers distinguish many types of pulsating stars
which can be very different, but vibrations of varying amplitude
characteristic of at least the majority of stars. Some, such as the Sun, on small
periods of time virtually unchanged, while others, such as
classical Cepheids are experiencing significant ripple size and temperature

Some types of pulsations were considered by theorists for
decades ago before the opening in the observations. In particular, it happened with the pulsations
caused by changing tides, with only the appearance of detailed observations
space telescope Kepler has allowed to open them. The most striking
representatives of this class of pulsating bodies are “stars
heartbeat” (heartbeat stars), which are traded on elongated orbits and at
a close passage to deform, which makes them curve like
the cardiogram.

Scientists led by Gerald Handler (Gerald Handler)
from the Astronomical center of Nicolaus Copernicus and his colleagues from Australia, Spain, Poland, USA and Japan have discovered the first example of a double star, in
where pulsations of one component to occur about an axis lying in
the plane of the orbit — HD 74423. As a result of interaction, the oscillations become
heterogeneous and amplitude in one hemisphere is about ten
times more than the opposite, which makes this object the first known
with such a significant asymmetry of the ripples.

Unlike “stars in a heartbeat”, which
periodic tides are the cause of the pulsation, in this case, the impact
close the component tilts the axis of the pulsations relative to the axis of rotation. In
the result of the surge occurring along the axis, almost coinciding with the line of apses.
Such conclusion scientists have made since the pulsation was synchronized with the orbital
phase double, which was determined based on spectroscopic measurements.

Astronomers say that at the moment HD is 74423
a unique object, but there must be others like it. While the main
issue in terms of this system remains on which side of the surge enhanced: on
addressed to the companion or opposite. In the broader context of researchers
I hope to understand whether excited during the tidal interactions of the acoustic p-modes due to
fluctuations in pressure or gravitational g-modes, which are caused by movement of the inside lights parts
of different densities.

Previously, astronomers first saw the bubbles on the surface of another star, has restricted the change of the gravitational constant with the pulsation of an ancient star and recorded a piece for variable star Y Giraffe and piano.

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