The search for solar-type oscillations in other stars using the Michelson Interferometric Stellar Oscillation Spectrometer (ISOS)

Details The search for solar-type oscillations in other stars using the Michelson Interferometric Stellar Oscillation Spectrometer (ISOS) The search for solar-type oscillations in other stars using the Michelson Interferometric Stellar Oscillation Spectrometer (ISOS)

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..563p&link_type=abstract

In ESA, Seismology of the Sun and Sun-Like Stars p 563-567 (SEE N89-25819 19-92)

Physics

3

Line Spectra, Michelson Interferometers, Stellar Luminosity, Stellar Oscillations, Absorption Spectra, Signal To Noise Ratios, Stellar Physics

Scientific paper

Improving the signal-to-noise (SNR) of measurements of solar 5 min oscillations with Michelson ISOS by using the many suitable absorption lines in a 400 A band of spectrum is described. In order to show that the multilining technique improves the SNR it is necessary to detect radial velocity changes having added many lines together, maintaining the fringe contrast. A fringe of the 5406 A line and a fringe of 16 lines added together are shown. There is a reduction in contrast of 20 percent between the 2 fringes. The flux increases 14-fold when 16 lines are used. The short fall was due to dead time effects in the photon-counting electronics at the high count rates obtained from the Sun. Dead time effects also account for an increase in the mean level of the 16 line fringes and part of the reduction in contrast. The count rates expected from a 0m star using a 4.2m telescope would be a factor of 10 lower at 1 million photons/sec. The solar 5-min oscillation was detected after an observation of 2.28 hr using 11 lines. The results on the Sun show that a noise level sufficiently low to detect sub-meter per second solar-type oscillations in other stars is now possible with the multilined Michelson ISOS.

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