Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..399w&link_type=abstract
Advances in Space Research, Volume 13, Issue 12, p. 399-402.
Other
1
Scientific paper
We summarize the analysis of a new PG 1159 star, i.e., a hydrogen deficient pre-white dwarf detected in the ROSAT XRT all sky survey /1/. The X-ray source RX J2117.1+3412 is relatively faint (≈0.33 cnt s-1) and was selected for optical identification on the basis of its extreme X-ray softness. With V= 13.2, the counterpart of the X-ray source is in the optical the second brightest member of the PG1159 class. CCD imagery reveals that the star is surrounded by an old highly excited planetary nebula of faint surface brightness. Optical line profiles of HeII, CIV, and OVI and the overall optical and ROSAT PSPC (0.1-2.4 keV) energy distributions are compared to predictions of NLTE model atmospheres. We find an excellent agreement between the atmospheric parameters derived from optical and soft X-ray data. The effective temperature of the star is extremely high (150,000 K). Abundances of He, C and O are found to be consistent with those derived in other PG1159 stars whereas the surface gravity is significantly smaller in RXJ2117.1+3412. New optical spectra presented here show the presence of ultra-high excitation lines of O VIII.
Motch Ch.
Pakull Manfred W.
Werner Kirstin
No associations
LandOfFree
Non-LTE analysis of a new pulsating PG 1159-type central star detected in the ROSAT XRT all sky survey 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 Non-LTE analysis of a new pulsating PG 1159-type central star detected in the ROSAT XRT all sky survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-LTE analysis of a new pulsating PG 1159-type central star detected in the ROSAT XRT all sky survey will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-783029