Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.5405s&link_type=abstract
American Astronomical Society Meeting 203, #54.05; Bulletin of the American Astronomical Society, Vol. 35, p.1294
Astronomy and Astrophysics
Astronomy
Scientific paper
The K0 IV star HR 1608 is a single-lined spectroscopic binary with a period of 896 days. IUE spectroscopy of HR 1608 by Landsman et al. (1993) revealed that the companion is a hot white dwarf with a temperature of about 25,000 K. We estimate a white dwarf mass of 0.39± 0.02 M&sun; by combining the results of our radial velocity monitoring with an astrometric orbit calculated from the Hipparcos Intermediate data and an estimate of the primary mass. Therefore, the white dwarf in HR 1608 must have a helium core.
On 18 Aug 2003 we obtained a STIS medium-resolution echelle (E140M) spectrum of HR 1608 in order to ascertain the presence of spectral lines suitable for determining a UV orbital solution. Such a solution would allow a dynamical estimate of the white dwarf mass which is independent of any assumed mass-radius relation. The STIS spectrum indeed shows narrow lines of N V, Si IV, and C IV at velocities consistent with a photospheric origin. The strength of these high temperature lines is unusual for a DA white dwarf and we discuss possibilities for their origin.
Landsman Wayne B.
Latham Dave W.
Sandstrom Karin M.
Torres Gabino
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