Abstract
THE HOTTEST STARS.—Under this heading, Dr. Ant. Pannekoek communicates a short note to the Astronomische Nachrichten, No. 4657. It relates to the list of spectral-photometric measures made by Herr H. Rosenberg (see this column, May 29) of the temperatures of the hotter stars. Dr. Pannekoek states that from this list a regular increase of the figures takes places with the class-number of the spectra according to Miss Maury's classification. Whether this increase commences at the beginning or in which class the helium or the whitest or hottest stars are to be found cannot be clearly stated in consequence of the few stars discussed. Dr. Panne koek utilises the large quantity of material available in the catalogue of colour-estimations by Osthoff, and while they give no results of absolute temperature, they are of value from a relative point of view. The comparison of these values with Miss Maury's types brings out the result that lowest colour number corre sponds with her class IV. or IV.-V., or the typical helium stars. On either side of these classes the colour numbers increase, and the temperature de creases not only on the side of the Sirian stars of the first type, but also towards the Wolf-Rayet stars. The following is the complete table which he gives in the paper, but here Miss Maury's classes are pre ceded by the equivalents in Sir Norman Lockyer's classification for comparison:—
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Our Astronomical Column . Nature 91, 487 (1913). https://doi.org/10.1038/091487a0
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DOI: https://doi.org/10.1038/091487a0