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NAM2012 - All Presentation Details

Record 719 of 756

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The Tidal Excitation of Oscillations and Heartbeat Stars

Author: Kelly Hambleton

UCLan

Co-Authors: Don Kurtz (UCLan), Andrej Prsa (Villanova University), Steven Bloemen (Katholeke Universiteit Leuven), Jonh Southworth (Keele University)

Session: STA2: Binary Stars: Duplicity is Everywhere

Presentation type: Talk      10:15  Thursday 29th 10:00-11:15 

Summary:

The tidal excitation of stellar oscillations occurs in eccentric binary systems due to the varying tidal forces on the stellar components. The signature of tidally excited modes is a frequency (or set of frequencies) that are precise multiples of the binary orbital frequency. Heartbeat stars are an entirely new class of object, first observed by Kepler, that demonstrate tidally excited modes and an increase in flux at periastron, similar in nature to the those seen in ellipsoidal variables. As the shape and size of the periastron brightening is highly dependent on quantities such as the eccentricity and argument of periastron, through binary modelling and the theory of tidally induced pulsations we are able to determine information about the orbital evolution of these fascinating systems. Moreover, through the asteroseismology of the non-resonant modes present in a selection of these objects we are able to determine information about the internal structure of the stellar components. We present an array of binary stars demonstrating tidal excitation including a selection of of Heartbeat stars. We demonstrate how the rate of apsidal advance can be measured in Heartbeat stars and thus how we can obtain a measure of the density distribution of the stellar components.

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