Phase lags from multiple flux curves of OH/IR stars

Details Phase lags from multiple flux curves of OH/IR stars Phase lags from multiple flux curves of OH/IR stars

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239..193v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 193-204.

Statistics

Computation

74

Computational Astrophysics, Hydroxyl Emission, Infrared Stars, Interstellar Masers, Astronomical Models, Emission Spectra, Stellar Envelopes, Stellar Luminosity

Scientific paper

This paper presents an algorithm for measuring the phase lag (i.e., the difference in travel time between the emission from the front and the back of the circumstellar shell) from the time series of calibrated OH 1612 MHz spectra. The algorithm is derived by combining estimates of phase lags between the flux curves of various pairs of spectral channels under the assumptions of spherical symmetry and saturated masering. The implementation of the algorithm is described. Furthermore, an expression is derived for the error in phase lags in terms of observational parameters, making it possible to predict the accuracy with which a phase lag can be obtained.

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