Physics
Scientific paper
Aug 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966saosr.219.....v&link_type=abstract
SAO Special Report #219 (1966)
Physics
3
Scientific paper
In 1964 the author published a study of the meteor luminous efficiency based on Harvard's photographic data. This paper presents a more sophisticated analysis of the same data, since it takes better into account the effects of fragmentation. On the w whole, 1964 results are confirmed, but the accuracy is greatly improved. The luminous efficiency τp can be expressed as a function of velocity simply as τp = 1.0 X 10-19 v, with v in cm sec-1 and the luminosity expressed in units of O-mag stars. The uncertainty is +/- 0.1 in the velocity exponent and about 40% in the coefficient. It is confirmed that, in the mass range 10-2 to 30 g, the luminous efficiency does not depend either on mass or on brightness, nor does it show any variation in the course of the trajectory. The coefficient, τop = 1 X 10-19 0 mag g-1 cm-3 sec4, has been established by means of the data on three asteroidal meteors. Once the mass scale has determined. Most meteors, both sporadic and shower, have an average density in the vicinity of 0.2 g cm-3. It appears, however, that a small group of sporadic meteors in very short orbits exists, with higher densities of the order of 1 g cm -3. Because of selection effects, it is impossible to estimate the actual consistency of this group; it is clear, however, that it must represent a very small minority of cometary meteors.
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