Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9730t&link_type=abstract
HST Proposal ID #9730
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #9730 Hot Stars
Scientific paper
We propose to observe the FUV spectrum of the hot, helium-core white dwarf in the binary system HR 1608 in order to determine if there are suitable spectral lines to obtain a radial velocity orbit for the white dwarf star. The primary star in this system, with spectral type K0 IV, dominates the spectrum at visual wavelengths. At a temperature of around 25, 000 K, however, the white dwarf outshines the primary in the UV. The orbital motion of the primary star has been monitored for seven years with the CfA Digital Speedometer at Oak Ridge Observatory in Harvard, MA. In addition, the Hipparcos team noted excess scatter in the astrometric solution which, though unexplained at the time, we now know to be due to the orbital motion. Combining the astrometric and spectroscopic data, we have solved for the orbital elements, including the inclination of the system. In order to obtain a dynamical mass for the star, the orbital motion of both stars must be observed, thus the need for monitoring the white dwarf in the UV. As the first step in this endeavor, we propose to obtain a STIS spectrum of the white dwarf star to discover if there are spectral lines with which its radial velocity could be measured precisely enough to calculate a dynamical mass.
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