The Helium Abundance in the Ejecta of U Scorpii

Details The Helium Abundance in the Ejecta of U Scorpii The Helium Abundance in the Ejecta of U Scorpii

2011-09-12

arxiv.org/abs/1109.2468v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in MNRAS

Scientific paper

U Scorpii is a recurrent nova which has been observed in outburst on 10 occasions, most recently in 2010. We present near-infrared and optical spectroscopy of the 2010 outburst of U Sco. The reddening of U Sco is found to be $E(B-V) = 0.14\pm0.12$, consistent with previous determinations, from simultaneous optical and near-IR observations. The spectra show the evolution of the line widths and profiles to be consistent with previous outbursts. Velocities are found to be up to 14000\,kms$^{-1}$ in broad components and up to 1800\,kms$^{-1}$ in narrow line components, which become visible around day 8 due to changes in the optical depth. From the spectra we derive a helium abundance of $N$(He)/$N$(H)$ = 0.073\pm0.031$ from the most reliable lines available; this is lower than most other estimates and indicates that the secondary is not helium-rich, as previous studies have suggested.

Affiliated with

Also associated with

No associations

Rating

The Helium Abundance in the Ejecta of U Scorpii 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 The Helium Abundance in the Ejecta of U Scorpii, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Helium Abundance in the Ejecta of U Scorpii will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-60078