Photon Noise-limited Doppler Asteroseismology with a Fourier Transform Seismometer. I. Fundamental Performances

Details Photon Noise-limited Doppler Asteroseismology with a Fourier Transform Seismometer. I. Fundamental Performances Photon Noise-limited Doppler Asteroseismology with a Fourier Transform Seismometer. I. Fundamental Performances

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasp..115..990m&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 810, pp. 990-1001.

Astronomy and Astrophysics

Astronomy

15

Instrumentation: Interferometers, Stars: Oscillations, Techniques: Interferometric, Techniques: Spectroscopic

Scientific paper

The photon noise-limited performances of a Fourier transform (FT) seismometer for ground-based asteroseismological observations are computed. Simulations are conducted for a set of stars close to solar type, with V magnitude equal to 4 and vsini from 0 to 40 km s-1, extended to 100 km s-1 and 8500 K in order to include δ Scuti stars. Two instrumental configurations are considered and compared: the simplest one matched to a narrowband, visible spectral range, and another one that implies a low-resolution postdisperser, which covers a large portion of the visible domain. The final results are presented as the ratio of the expected uncertainties of the FT seismometer, in the version with a postdisperser, to the minimum radial velocities obtained with a grating spectrometer, on the same stellar targets. This ratio varies roughly between 1 and 2; it is close to 1 for fast rotators. It is concluded that the FT seismometer can be a challenging solution for a network dedicated to asteroseismology.

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