Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 11, 2025
Campbell vainly looked for them, visually in 1894, spectrographically in 1896; Keeler was equally unsuccessful; Jewell holds that they could, with present appliances, only be perceived if the atmosphere of Mars were much richer in water-vapour than that of the earth.
Thirty-two Wolf-Rayet stars were investigated, spectroscopically and spectrographically, by Professor Campbell with the great Lick refractor in 1892-94; and several disclosed the singularity, already noticed by him in Gamma Argûs, of giving out mixed series, the members of which change from vivid to obscure with increase of refrangibility.
A photographic photometry of all the lucid stars, modelled on the visual photometry of 1884, is promised from the same copious source of novelties. The magnitudes of the stars in the Draper Catalogue were determined, so to speak, spectrographically.
Vogel to investigate spectrographically some hundreds of stars fainter than the second magnitude; and the materials thus accumulated should largely help to provide means for a definite and complete solution of the more than secular problem of the sun's advance through space.
Word Of The Day
Others Looking