Photospheric Silicon in the DA White Dwarf Wolf 1346

Details Photospheric Silicon in the DA White Dwarf Wolf 1346 Photospheric Silicon in the DA White Dwarf Wolf 1346

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111.2361h&link_type=abstract

Astronomical Journal v.111, p.2361

Astronomy and Astrophysics

Astronomy

8

White Dwarfs, Stars: Individual: Wolf 1346, Stars: Abundances

Scientific paper

We present a new coadded lUE echelle spectrum of the moderate temperature (Teff ˜20,000 K) DA white dwarf Wolf 1346. In addition to previously reported stellar and interstellar features, we find a number of new stellar lines due to Si II and Si III. These silicon features have observed Doppler velocities near the +23 km s-1 stellar photospheric velocity determined from the non-LTE core of the stellar Hα profile. The velocities and observed strengths of these lines are consistent with a photosperic origin. We derive a Si abundance of log(Si/H)=-7.5±0.2 which is comparable to the Si abundance expected from radiative levitation.

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