Discovery of a new extremely hot DA white dwarf close to the open cluster NGC 6405

Details Discovery of a new extremely hot DA white dwarf close to the open cluster NGC 6405 Discovery of a new extremely hot DA white dwarf close to the open cluster NGC 6405

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217l...1k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

3

H Lines, Hot Stars, Open Clusters, Stellar Atmospheres, White Dwarf Stars, Balmer Series, Spectral Line Width, Stellar Spectra, Stellar Temperature

Scientific paper

The discovery of an extremely hot white dwarf of spectral type DA about 28 arcmin from the center of the galactic cluster NGC 6405 is reported. The atmospheric parameters derived from the observed equivalent widths of the Balmer lines and theoretical model atmospheres are T(eff) = 70,000 K, log g = 7.9. While a large number of white dwarfs with helium-dominated atmospheres are known in the range T(eff) of roughly 60,000 K to 100,000 K, hydrogen-dominated spectra (DA) are extremely rare. The new object seems to be one of the hottest DA with a reasonable well established temperature.

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