A cool DA white dwarf with self-broadened lines

Details A cool DA white dwarf with self-broadened lines A cool DA white dwarf with self-broadened lines

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186..399w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 186, Feb. 1979, p. 399-404.

Statistics

Computation

17

Balmer Series, Spectral Line Width, Stellar Spectra, White Dwarf Stars, Abundance, H Alpha Line, H Beta Line, Metals, Stellar Temperature

Scientific paper

Image dissector scanner data and spectroscopic data of the white dwarf BPM 4729 are presented and analyzed. The metal abundance is deduced to be less than 0.0001 of the solar value. The spectrum shows a steep Balmer decrement with only H-alpha and H-beta visible. This observation is in agreement with recent theoretical computations and suggests that hydrogen-rich white dwarfs with electron temperatures of no more than 5000 K should show no Balmer lines. It is shown that the spectrum of BPM 4729 is unique among white dwarfs in that the visible Balmer lines are broadened by self-broadening.

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