Whole earth telescope observations of the DBV white dwarf GD 358

Details Whole earth telescope observations of the DBV white dwarf GD 358 Whole earth telescope observations of the DBV white dwarf GD 358

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..839w&link_type=abstract

The Astrophysical Journal, vol. 430, no. 2, pt. 1, p. 839-849

Astronomy and Astrophysics

Astrophysics

194

Light Curve, Stellar Luminosity, Stellar Magnetic Fields, Stellar Mass, Stellar Rotation, Stellar Spectra, White Dwarf Stars, Astrophysics, Magnetic Flux, Seismology, Spectrum Analysis, Stellar Atmospheres, Stellar Evolution

Scientific paper

We report on the analysis of 154 hours of early continuous high-speed photometry on the pulsating DB white dwarf (DBV) GD 358, obtained during the Whole Earth Telescope (WET) run of 1990 May. The power spectrum of the light curve is dominated by power in the range from 1000 to 2400 microHz with more than 180 significant peaks in the total spectrum. We identify all of the triplet frequencies as degree l = 1, and from the details of their spacings we derive the total stellar mass as 0.61 + or - 0.03 solar mass, the mass of the outer helium envelope as 2.0 + or - 1.0 x 10-6 M*, the absolute luminosity as 0.050 + or - 0.012 solar luminosity and the distance as 42 + or - 3 pc. We find strong evidence for differential rotation in the radial direction -- the outer envelope is rotating at least 1.8 times faster than the core -- and we detect the presence of a weak magnetic field with a strength of 1300 + or - 300 G. We also find a significant power at the sums and differences of the dominant frequencies, indicating nonlinear processes are significant, but they have a richness and complexity that rules out resonant mode coupling as a major cause.

Affiliated with

Also associated with

No associations

Rating

Whole earth telescope observations of the DBV white dwarf GD 358 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 Whole earth telescope observations of the DBV white dwarf GD 358, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Whole earth telescope observations of the DBV white dwarf GD 358 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1494277