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Astron. Astrophys. 343, 899-903 (1999)


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Hubble Deep Field guide star photometry *

K. Zwintz 1, R. Kuschnig 1, W.W. Weiss 1, R.O. Gray 2 and H. Jenkner 3,4

1 Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria (last_name@galileo.astro.univie.ac.at)
2 Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USA (grayro@conrad.appstate.edu)
3 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA (jenkner@stsci.edu)
4 On assignment from the Astrophysics Division, Space Science Department, European Space Agency (ESA)

Received 20 July 1998 / Accepted 24 December 1998

Abstract

Since the advent of asteroseismology as a promising innovative tool for investigating internal stellar structure, numerous attempts to detect solar type oscillations in distant stars have been conducted. The three Fine Guidance Sensors of the Hubble Space Telescope can contribute to asteroseismology, but only after the data have been corrected for systematic effects, the South Atlantic Anomaly and terrestrial stray light being the most important. We have applied these corrections and obtained essentially photon noise-limited photometry for two guide stars used during the Hubble Deep Field program.

Ground-based spectral classification has revealed that the brighter of the two guide stars is a solar-type star with a spectral type of G2mG0IV . Fine Guidance Sensor photometry for this star gives a noise level in the amplitude spectrum of only 23 ppm, which makes it a good candidate for detecting stochastically driven oscillations. We compare our result with theoretical predictions.

The second guide star was classified as K1V and therefore is not a candidate for solar type oscillations.

Key words: techniques: photometric – stars: fundamental parameters – stars: individual: GS 0416200054 – stars: individual: GS 0416200075 – stars: oscillations

* Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

Send offprint requests to: Werner W. Weiss (weiss@astro.univie.ac.at)

© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999

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