Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994japa...15...39h&link_type=abstract
Journal of Astrophysics and Astronomy, Vol. 15, NO. 1/MAR, P. 39, 1994
Astronomy and Astrophysics
Astronomy
1
Astronomical Interferometry, Radio Sources (Astronomy), Cerenkov Radiation, Quantum Statistics
Scientific paper
A brief account is given of the early development of a new technique, intensity interferometry, to measure the angular size of radio sources. Following the chance discovery that it was unaffected by scintillation it was proposed to apply the same principle to measuring visable stars. This proposal met with vigorous opposition from physicists when it was realized that it implied that the time of arrival of photons in two mutually coherent beams of light must be correlated. Two laboratory experiments were done to demonstrate that this correlation does in fact take place. Then, after a pilot model had measured the angular size of Sirius, a full scale stellar intensity interferometer was built and installed at Narrabri in Australia. In a program lasting 12 years it measured the angular diameters of 32 single stars in the spectral range O to F and established the first wholly empirical temperature scale for stars in that range. For the last 10 years the work has been continued by the construction of the larger and more sensitive Sydney University Stellar Interferometer called SUSI.
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