A Century's Progress in AstronomyMacpherson, Hector
History
A Century's Progress in Astronomy
Macpherson, Hector
Astronomy -- History
Proctor’s discovery of the excess of bright stars on the Galaxy was
confirmed by _Jean Charles Houzeau_ (1820-1888), director of the
Brussels Observatory. Some time later J. E. Gore carefully examined the
positions of all the brighter stars in the northern and southern
hemisphere. Following this, he made an enumeration of the stars in the
atlas of Heis and in the charts constructed by Harding; the outcome of
the investigation being to show that stars of each individual magnitude
taken separately tend to aggregate on the Galaxy, the aggregation being
noticed even in first-magnitude stars. Gore further pointed out many
cases of close connection between the lucid stars and the galactic
light. A similar investigation was undertaken by Schiaparelli in 1889.
Schiaparelli, basing his work on the catalogue of Gould and the
photometric measures of Pickering, constructed a series of planispheres
which demonstrated the crowding of the lucid stars towards the plane of
the Galaxy. These investigations were still further continued by Simon
Newcomb, who demonstrated that “the darker regions of the Galaxy are
only slightly richer in stars visible to the naked eye than other parts
of the heavens, while the bright areas are between 60 and 100 per cent
richer than the dark areas.” The Dutch astronomer, _Charles Easton_,
finds a connection between the distribution of ninth-magnitude stars and
the luminous and obscure spots in the Galaxy.
It was noticed by Gould, from observations made at Cordova, that “a belt
or stream of bright stars appears to girdle the heavens very nearly in a
great circle which intersects the Milky Way.” According to Gould, the
belt includes Orion, Canis Major, Argo, Crux, Centaurus, Lupus, and
Scorpio in the southern hemisphere, and Taurus, Perseus, Cassiopeia,
Cepheus, Cygnus, and Lyra in the northern. This was interpreted by
Celoria as indicating the existence of two galactic rings, but Gould
considered the zone of bright stars to form with the Sun a subordinate
cluster of about five hundred stars within the Galaxy.
Public-domain text, read in full here on John Shaqi.
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