An early-medieval account on the red colour of Sirius and its astrophysical implications

Details An early-medieval account on the red colour of Sirius and its astrophysical implications An early-medieval account on the red colour of Sirius and its astrophysical implications

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318...45s&link_type=abstract

Nature (ISSN 0028-0836), vol. 318, Nov. 7, 1985, p. 45, 46.

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Computation

23

A Stars, Red Dwarf Stars, Stellar Color, Stellar Evolution, White Dwarf Stars, Color-Magnitude Diagram, Hertzsprung-Russell Diagram, Histories

Scientific paper

New and apparently independent information about Red Sirius from an early medieval manuscript is presented. Red stars in ancient records are those with color index B-V + 1.0 or greater. Assuming an unchanged Sirius A, this lower limit for the combined color of Sirius A and B allows the computation of the region of pre-white dwarf Sirius B in the Hertzsprung-Russell diagram or color-magnitude diagram. Sirius B lies on the giant branch, which fits well with the observational and theoretical framework of stellar evolution. However, the timescale of transformation of a red giant to a white dwarf is surprisingly short.

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