Hubble Space Telescope HRS Spectroscopy of U GEMINORUM in Quiescence: Rotation of the White Dwarf

Details Hubble Space Telescope HRS Spectroscopy of U GEMINORUM in Quiescence: Rotation of the White Dwarf Hubble Space Telescope HRS Spectroscopy of U GEMINORUM in Quiescence: Rotation of the White Dwarf

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.6309s&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #63.09; Bulletin of the American Astronomical Society, Vol. 25, p.909

Astronomy and Astrophysics

Astronomy

Scientific paper

We obtained a Hubble Space Telescope HRS spectrum of U Gem in quiescence, on September 23, 1992, 24 days after the start of its outburst of 29 August, 1992 and 8 days after the return to optical quiescence. The observation was made using the G160M disperser and covered the region 1370 Angstroms to 1402 Angstroms. We report the detection of the first fully resolved line profile (Si IV 1393, 1402 resonance doublet) of a cataclysmic variable white dwarf. The profile is unsaturated, both line cores are resolved and the wings of the profiles appear too broad for the central depths, suggesting that rotational broadening is contributing significantly as well as collisional broadening. The components have widths of approximately 2 Angstroms. If the widths are dominated by rotational broadening, then an upper limit v sin i = ~ 500 km/s is implied. The line centers are red-shifted to a velocity of 148 km/s. A preliminary fit, using theoretical profiles by I. Hubeny for Teff = 30,000K, log g = 7, requires a silicon abundance greater than solar in order to match the observed profiles. The results of more extensive profile fitting will be presented. The absence of O V 1371 provides an important constraint on the oxygen abundance and temperature of any heated equatorial region still present at the time of our observation. Support of this work was provided by NASA through grant GO3836.0191A from the Space Telescope Institute.

Affiliated with

Also associated with

No associations

Rating

Hubble Space Telescope HRS Spectroscopy of U GEMINORUM in Quiescence: Rotation of the White Dwarf does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hubble Space Telescope HRS Spectroscopy of U GEMINORUM in Quiescence: Rotation of the White Dwarf, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hubble Space Telescope HRS Spectroscopy of U GEMINORUM in Quiescence: Rotation of the White Dwarf will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1850206