NOAO >   Observing Info >   Approved Programs >   2007A-0226

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Proposal Information for 2007A-0226


PI: Michael Reed, Missouri State University, mreed@sdbv.missouristate.edu
Address: Physics Department, 901 S. National, Springfield, MO 65897, USA

CoI: Maja Vuckovic, Institute of Astronomy, Leuven, Belgium
CoI: Joe Eggen, Missouri State University

Title: Mode identification, seismological modelling, and the evolution of the unique sdO pulsator J160043.6+074802.9

Abstract: Despite the fact that stability analysis finds that sdO stars could pulsate in both p- and g-modes^1, not a single sdO pulsator had been confirmed, despite a targeted search, until the discovery of rapid pulsations in J160043.6+074802.9^2. The discovery data revealed at least ten periods between 59 and 120 s with the possibility of more modes under the detection threshold. Spectra reveal that the star is part of a binary system with likely a main sequence companion. We propose to obtain high-speed CCD observations using the KPNO 2.1m telescope as part of a multinational, multisite campaign. The combined data set will completely resolve the pulsation spectrum, examine amplitude stability, and make comparisons with the discovery data as well spectroscopic and multicolor observations simultaneous with our requested time. As such, we should be able to determine its fundamental properties using asteroseismology and constrain the nature of the companion.


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NOAO >   Observing Info >   Approved Programs >   2007A-0226

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