Word: spectras
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...photographs of the spectra of the stars taken at the Harvard College Observatory as part of the Henry Draper Memorial differ in two respects from those ordinarily taken elsewhere. Instead of using a spectroscope with a slit, in which but one star is photographed at a time, large prism is placed over the object glass of the telescope and thus spectra of all the bright stars in the field of view are obtained. The number of stars photographed simultaneously is still further increased by substituting for the object glass a portrait lens like that used by photographers, only larger...
...results obtained show an important resemblance between meteors and stars having bright lines in their spectra, and may aid in determining the conditions of temperature and pressure in these bodies. Since bright meteors sometimes appear during the November meteoric shower a special effort will be made here to obtain photographs of them, both trails and spectra, tonight...
...several years the Harvard Observatory has been engaged in photographing, both in Cambridge and Peru, the spectra of all stars above the eighth magnitude. Professor Pickering hoped when this work was undertaken that a meteor would sometime cross the field of one of the photographic prisms while taking the spectra, but this did not occur until recently...
...large portion of the investigatory work has been in the field of stellar spectra. Professor Pickering, in conjunction with others, has derived a new method of determining the relative motion of two stars in the line of sight. The method depends on the calculation, by means of photographic plates, of the relative variation in the position of the spectra of the two moving stars. There is reasonable belief that this method will enable such calculations to be made with a degree of accuracy hitherto unobtainable. The spectra of many obscure stars have been carefully studied, and in some cases, peculiar...
...announcement has just come from the Harvard Observatory of the discovery of 14 new variable stars. These discoveries were made on examination of the Henry Draper memorial photograps of stellar spectra taken by Mrs. Fleming During last November an announcement of six new variables was made, and in last July of seven...