Other
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2350...68f&link_type=abstract
In NASA. Ames Research Center Proc. of the Workshop on Improvements to Photometry p 68-78 (SEE N85-17892 08-89)
Other
6
Brightness Distribution, Doppler Effect, Frequency Shift, Photometry, Radial Velocity, Seismology, Stars, Stellar Oscillations, Amplitudes, Atmospherics, Power Spectra, Stellar Activity
Scientific paper
Low degree p-modes of the Sun have been measured in spatially integrated sunlight (the Sun as a star) both in Doppler shift and in intensity fluctuations. These observations are a good starting point for the discussion of the best way to collect equivalent data on other stars. It is assumed that the Sun is removed far enough in space to become an ordinary star of magnitude zero to one. Evidently another star will oscillate with different frequencies and different amplitudes, but some reference must be made to start with. Using this scheme, a detailed investigation of the limitations of observational accuracy in the search for global p-modes is made. The sources of noise stand in the Sun itself, in the instrumentation, in the observing time duration, in the corpuscular nature of the light and mostly in the Earth atmosphere in the case of ground based observations.
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