Ultraviolet spectrum synthesis of the helium white dwarf Ross 640

Details Ultraviolet spectrum synthesis of the helium white dwarf Ross 640 Ultraviolet spectrum synthesis of the helium white dwarf Ross 640

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..941c&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 15, 1980, p. 941-945.

Astronomy and Astrophysics

Astronomy

23

Abundance, Helium, Stellar Atmospheres, Stellar Spectra, Ultraviolet Astronomy, White Dwarf Stars, Calcium, Iron, Iue, Magnesium, Photosphere, Spectrum Analysis, Stellar Temperature, Ultraviolet Spectra

Scientific paper

The UV spectrum of the He-rich white dwarf Ross 640 was used to derive Mg, Si, and Fe abundances by a spectrum synthesis technique. The values obtained were: Mg/He = 6.8 x 10 to the -8th; Si/He = 3.2 x 10 to the -8th; Ca/He = 7.6 x 10 to the -10th; and Fe/He = 2.0 x 10 to the -9th. The abundances indicate the operation of diffusion processes within a helium-rich atmosphere, provided some mechanism exists to deposit metals in the observable layers.

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