Their topics include fundamentals of stellar variability observations, stellar structure and evolution theory, stellar pulsation
theory, Cepheid and related variable stars, pulsating stars close to the lower main sequence in the H-R diagram, hot subdwarf pulsators, and pulsating degenerate stars.
The mass of the Cepheid is now known to about 1percent and agrees exactly with predictions from the theory of stellar pulsation
. However, the larger mass predicted by stellar evolution theory was shown to be significantly in error.
He is the author of the books "Stellar Pulsation
" (2001) and "Pulsating Stars" (1998).
& Polano S., 'Pulsation modes in M Giants' in A half century of stellar pulsation
interpretation: a tribute to Arthur N.
The lectures topics include an overview of astronomical databases, space photometry and time series analysis, the virtual observatory, binaries as astrophysical laboratories, binary stars and their light curves, eclipsing binary stars, stellar pulsation
, intrinsic variability in multiple systems and clusters, and pro-am collaboration and the AAVSO.
Mayor and Queloz were well aware of this when they went public, and their published account addressed stellar pulsation
or the rotation of a spotted star as alternative interpretations.
The team chose to concentrate on 28 stars for which mass and radius have previously been measured, using asteroseismology -- a technique that measures stellar pulsations
, which reflect a star's mass and radius.
The 88 papers presented during the July 2011 meeting share recent research on stellar pulsations
, magnetic fields, mass loss and clumping in hot stellar winds, massive star wind models, massive binaries, young open star clusters, and massive star formation.
There is clear kinship between these events, and there's growing suspicion that many ultraluminous supernovae are actually driven by stellar pulsations
rather than terminal explosions.
"Such variations are thought to be caused by what we call 'stellar pulsations
'," said Nicholls.
Moreover, neither stellar pulsations
nor other effects, such as modulation of spectral-line profiles by magnetic or starspot activity, would be expected to show such perfectly sinusoidal behavior.