Discovery of Germanium, Arsenic, Selenium, Tin, Tellurium, and Iodine in the Atmospheres of Cool DO White Dwarfs

Details Discovery of Germanium, Arsenic, Selenium, Tin, Tellurium, and Iodine in the Atmospheres of Cool DO White Dwarfs Discovery of Germanium, Arsenic, Selenium, Tin, Tellurium, and Iodine in the Atmospheres of Cool DO White Dwarfs

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99..128c&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.128

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We analyze Far Ultraviolet Spectroscopic Explorer (FUSE), Goddard High Resolution Spectrograph, and International Ultraviolet Explorer spectra of the cool DO white dwarfs HD 149499 B and HZ 21, and identify photospheric lines of elements beyond the iron group. Germanium (Z = 32), arsenic (33), and tellurium (52) are detected in both stars. Selenium (34), tin (50), iodine (53), and perhaps bromine (35) are also observed in HD 149499 B. The observation of arsenic, selenium, tellurium, and iodine is a first for white dwarfs. Light elements such as carbon, silicon, phosphorus, and sulfur are observed in both stars, but nitrogen is only detected in HZ 21. We carry out a spectral synthesis analysis for both stars. The mass fractions of elements heavier than iron range from about a factor of 3 to a factor of 1000 relative to the Sun. We propose that both stars show the effect of nucleosynthesis during the asymptotic giant branch phase of their evolution.

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