Ongoing Mass Ejection in the Peculiar, Hot Do Degenerate KPD 0005+5106

Details Ongoing Mass Ejection in the Peculiar, Hot Do Degenerate KPD 0005+5106 Ongoing Mass Ejection in the Peculiar, Hot Do Degenerate KPD 0005+5106

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113..364s&link_type=abstract

Astronomical Journal v.113, p.364

Astronomy and Astrophysics

Astronomy

12

White Dwarfs, Stars: Individual: Kpd 0005+5106

Scientific paper

We present an analysis of four high-resolution far-ultraviolet spectra of the hot, peculiar DO white dwarf KPD 0005+5106 obtained with short-wavelength prime (SWP) spectrograph aboard the International Ultraviolet Explorer (lUE) spacecraft. These spectra reveal weak, probably variable, peculiar absorption and emission transitions of ultrahigh excitation C V and N V in the 1615-1623 Å region, 0 VIII variable coronal emission, variable line structure at Re II (1640), and essentially constant photospheric/circumstellar/ interstellar blended N V, Si IV, and C IV resonance absorption. Our four lUE echelle spectra confirm the high excitation C IV absorption feature at 1230.55 Å but reveal little evidence of the high excitation C IV features at 1351 and 1353 Å seen most strongly in the PG 1159 degenerates. Moreover, high excitation 0 vi and C IV transitions are at most very minor contributors to the broad absorption at 1640 Å. We find distinct evidence of a moderately dense neutral cloud along the line of sight to KPD 0005. This cloud, if near the white dwarf, may interact with the stellar wind to produce a zone of shock-induced high ionization. The nonphotospheric interstellar/circumstellar components of the N V resonance doublet in KPD 0005 yield a column density log N (N v)= 13.8, a factor of 8-10 higher than the value which might be expected from the diffuse ISM. The nonphotospheric components of N V in the PG 1159 object RXJ 2117+3412 have a similar velocity (50 km/s) relative to the photospheric rest frame and are markedly stronger. Both objects exhibit strong O VIII emission, a possible marker of mass loss. These characteristics providing compelling evidence that the nonphotospheric N V absorption is locally associated with these two hot degenerates and almost certainly ejected.

Affiliated with

Also associated with

No associations

Rating

Ongoing Mass Ejection in the Peculiar, Hot Do Degenerate KPD 0005+5106 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 Ongoing Mass Ejection in the Peculiar, Hot Do Degenerate KPD 0005+5106, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ongoing Mass Ejection in the Peculiar, Hot Do Degenerate KPD 0005+5106 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1784896