Stellar Seismology from Space: From the Sun to the Stars

Details Stellar Seismology from Space: From the Sun to the Stars Stellar Seismology from Space: From the Sun to the Stars

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8115v&link_type=abstract

HST Proposal ID #8115

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Hst Proposal Id #8115 Cool Stars

Scientific paper

We will use STIS to obtain the first unambigous detection of acoustic oscillations in a solar-type star other than the Sun. Numerous ground-based asteroseismology experiments have failed to produce a definitive signal partly because scintillation in the Earth's atmosphere limits photometric precision. From its vantage point in space, HST can reliably measure mode frequencies and dominant splittings with an accuracy of 3 MuHz in only 15 CVZ orbits. We will monitor brightness variations in a sequence of 3000+ exposures over a 24 hour period. Using the G430L grating to disperse the light over 2000 CCD pixels, a precision of 10^-4 will be achieved in each 5+20 second exposure. Detailed Monte Carlo simulations based on full-disk solar observations indicate that we will detect {>99% about a dozen distinct frequencies {0<=l<=2}. These frequency measurements will enable us to determine stellar mass, age, and helium abundance, while refining existing measurements of other parameters. Hipparcos parallaxes coupled with a detailed spectroscopic analysis will overconstrain stellar models, allowing a test of the underlying physics {the onset of core convection, for example}. This study will herald a new era of practical asteroseismology, and serve as a benchmark for future space missions dedicated to stellar seismology.

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