Testing the line-driven disk wind model: time-resolved UV spectroscopy of IX Vel and V3885 Sgr

Details Testing the line-driven disk wind model: time-resolved UV spectroscopy of IX Vel and V3885 Sgr Testing the line-driven disk wind model: time-resolved UV spectroscopy of IX Vel and V3885 Sgr

2001-12-18

arxiv.org/abs/astro-ph/0112424v2

Mon.Not.Roy.Astron.Soc. 332 (2002) 127

Astronomy and Astrophysics

Astrophysics

19 pages, 14 figures. Accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2002.05277.x

To confront the predictions of the most recent line-driven disk wind models with observational evidence, we have obtained HST STIS (1180--1700A) echelle spectra of the nova-like variables IX Vel and V3885 Sgr at three epochs. The targets were observed in timetag mode for ~2000sec on each occasion, allowing us to study the spectral time evolution on timescales down to ~10sec. The mean UV spectra are characterised by the wind signature of broad blueshifted absorption in Lya, NV1240, SiIV1398, CIV1549 and HeII1640. There is very little redshifted emission other than in CIV. Narrow blueshifted absorption dips, superposed on the broad absorption at around -900km/s, accompany periods of well-developed wind activity. The continuum level and mean line profiles vary markedly from observation to observation -- with the wind signatures almost disappearing in one epoch of observation of IX Vel. The strong positive correlation between UV brightness and wind activity predicted by line-driven disk wind models is disobeyed by both binaries. The wind signatures in IX Vel's UV spectrum are revealed to be remarkably steady on timescales ranging from ~10 to ~1000sec. More variability is seen in V3885 Sgr, the binary with the lower opacity outflow. But there is only one epoch in which the line profile changes significantly in ~100sec or less. Narrow absorption dips, when present, show only smooth, small changes in velocity.

Affiliated with

Also associated with

No associations

Rating

Testing the line-driven disk wind model: time-resolved UV spectroscopy of IX Vel and V3885 Sgr 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 Testing the line-driven disk wind model: time-resolved UV spectroscopy of IX Vel and V3885 Sgr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing the line-driven disk wind model: time-resolved UV spectroscopy of IX Vel and V3885 Sgr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-43788