DA white dwarfs in pointed observations from the ROSAT archive.

Details DA white dwarfs in pointed observations from the ROSAT archive. DA white dwarfs in pointed observations from the ROSAT archive.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...307..149w&link_type=abstract

Astronomy and Astrophysics, v.307, p.149

Astronomy and Astrophysics

Astrophysics

32

X-Rays: Stars, White Dwarfs

Scientific paper

87 pointed PSPC (Position Sensitive Proportional Counter) observations of hot DA white dwarfs, available in the ROSAT public archive until the end of 1994, have been analyzed together with Wide Field Camera (WFC) and EXOSAT data. From the 57 objects with a significant count rate half of the objects have a temperature below 38,000K and a virtually pure hydrogen atmosphere. At higher temperatures most (75%) objects emit a lower X-ray flux than predicted by hydrogen model atmospheres and must therefore contain heavier elements as absorbers. This is probably due to radiative acceleration which prevents these elements from sinking inwards. We also confirmed our previous result that the PSPC detector is a factor of two more sensitive to photons with energies below about 0.2keV.

Affiliated with

Also associated with

No associations

Rating

DA white dwarfs in pointed observations from the ROSAT archive. 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 DA white dwarfs in pointed observations from the ROSAT archive., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DA white dwarfs in pointed observations from the ROSAT archive. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1642291