Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.0515w&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #05.15; Bulletin of the American Astronomical Society, Vol. 32, p.684
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present computer simulations of interferometric studies of stellar surface structures with the Navy Prototype Optical Interferometer (NPOI). We realistically model center-to-limb intensity variations of giants and supergiants according to recent models of stellar atmospheres, as well as hot spots caused by large-scale photospheric convection. We simulate interferometric observations of these model stars covering a spectral range from 450 nm to 850 nm (resembling the NPOI spectral channels) and using uv configurations that are either currently available with NPOI (baselines up to 38 m) or that will be available in the near future using the extended NPOI array (baselines up to 437 m). Our simulations predict the expected squared visibilities as well as the amplitudes and phases of the tripleproducts, and we add realistic atmospheric and instrumental noise as experienced during previous observations. Model fitting and imaging using these data allows us (1) to test different fitting and imaging algorithms (2) to determine the optimum uv configuration for studying different stellar surface structures and (3) to find limitations and accuracies of determinations of the underlying astrophysical quantities. MW acknowledges support from the Alexander von Humboldt Foundation through a Feodor Lynen Fellowship.
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