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XXIX ESC General Assembly, Sept. 12-17, 2004 - GFZ

XXIX ESC General Assembly, Sept. 12-17, 2004 - GFZ

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Essential contributions achieved with the Great Refractor<br />

• First proof of an absorption line and thus<br />

→ discovery of the interstellar gas by<br />

Johannes Franz HARTMANN (1865-1936),<br />

→<br />

who worked from 1896-1909 at the AOP.<br />

• Contributions to an exact fotographic<br />

brightness scale of weak stars.<br />

• Temperature determination of fixed stars<br />

by visual spectral photometry.<br />

• Discovery and investigation of many double stars.<br />

1904 Karl Hermann STRUVE (1854-1920),<br />

grandson of Wilhelm STRUVE (<strong>17</strong>93-1864),<br />

the former director of the Russian Imperial<br />

Astronomical Observatory at Pulkovo, becomes<br />

director of the Berlin and from 1913-20 of the<br />

subsequent Babelsberg Astronomical Observ.<br />

Peter Bormann <strong>XXIX</strong> <strong>ESC</strong> <strong>General</strong> <strong>Assembly</strong>, <strong>Sept</strong>. <strong>12</strong>-<strong>17</strong>, <strong>2004</strong>

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