The influence of the C2 absorption bands on the U, B, V magnitudes of carbon white dwarfs

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Absorption Spectra, Carbon, Carbon Stars, Ubv Spectra, White Dwarf Stars, Calibrating, Stellar Parallax, Ultraviolet Spectra

Scientific paper

B and V colors are shown to be almost identically affected by blanketing due to C2 absorption bands in the carbon white dwarfs G 47-18 and G 99-37. Critical examination of the color-absolute magnitude relation in carbon white dwarfs with trigonometric parallaxes has led to two DC white dwarfs which, because of the strong absorption due to carbon revealed by ultraviolet observations, are added to the calibration undertaken. It is concluded that new UV observations are needed to improve understanding of the link between carbon and DC dwarfs.

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