Variable interstellar absorption lines in young stellar aggregates
Krełowski, J.; Strobel, A.; Vješnica, S.; Melekh, D.; Bondar, A.
Poland, Croatia, Ukraine
Abstract
The variability of interstellar atomic lines, sporadically reported in the astronomical literature, has been confirmed both in the case of the nearby hot star δ Ori and the very young and violent star-forming region η Carinae, using high-resolution echelle spectra. The presented variability concerns the intensities and profiles of Na I, K I and Ca II. The time-scale of the above-mentioned variations clearly suggests very local phenomena as their cause. It is important to say that not all interstellar lines vary in unison.