1,947 research outputs found
Detection of non-radial g-mode pulsations in the newly discovered PG1159 star HE 1429-1209
We performed time-series photometry of the PG1159-type star HE 1429-1209,
which was recently discovered in the ESO SPY survey. We show that the star is a
low-amplitude (about 0.05 mag) non-radial g-mode pulsator with a period of
919s. HE 1429-1209 is among the hottest known post-AGB stars (Teff=160000 K)
and, together with the known pulsator RX J2117.1+3412, it defines empirically
the blue edge of the GW Vir instability strip in the HRD at high luminosities.Comment: 4 pages, 4 figures, to be published in A&
On the capacity functional of excursion sets of Gaussian random fields on
When a random field is thresholded on a given
level , the excursion set is given by its indicator .
The purpose of this work is to study functionals (as established in stochastic
geometry) of these random excursion sets, as e.g. the capacity functional as
well as the second moment measure of the boundary length. It extends results
obtained for the one-dimensional case to the two-dimensional case, with tools
borrowed from crossings theory, in particular Rice methods, and from integral
and stochastic geometry.Comment: 19 page
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