|
The attached plot of some of my recent eta Car spectra is intended to show why a reasonably high resolution (R>5000) and S/N (>200) is needed. The HeII 4686 line is of major campaign interest and while it is low between periastrons (now) it will grow and vary as the main and primary eta Car component stars reach their close approach between June and September. The activity of the HeI 4712A line, due to wind-wind shock instabilities, is also of interest as it has not been previously monitored a high resolution.
Bernard
|