Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jrasc..79..302t&link_type=abstract
Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 79, Dec. 1985, p. 302-311.
Astronomy and Astrophysics
Astronomy
1
Cosmology, Doppler Effect, Stellar Motions, Hubble Constant, Red Shift, Velocity Distribution
Scientific paper
A blue-shift in the spectrum of a star indicates that it is approaching the observer, but it may not be doing so directly; it may have a transverse component ot its velocity. A star that is receeding will show a red-shift, but the converse is not necessarily true; a star that is approaching the observer at high speed may also show a red-shift unless the transverse component of its velocity is exactly zero. A star with neither red-shift nor blue-shift may nevertheless be moving very fast and the zero shift does not by any mans indicate that its velocity is transverse to the line of sight. If the direction of motion of a star is known and its blue-shift is measured, there is a two-fold ambiguity in its speed. Two unconventional alternative cosmologies are briefly discussed in the light of these curious and little-known results. These alternative cosmologies do not stand up to critical examination, and the conventional expanding universe best satisfies the observations.
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