The Appearance and Disappearance of Exocomet Gas Absorption

Figure 9

Stars showing no measurable change in their CaII K-line absorption between several nights’ observations. A typical spectrum from one night is shown for each of the 6 stars, together with their absorption EW value. The vertical arrow(s) shows the position of the projected velocity of the local interstellar cloud complex derived by Redfield and Linsky [13].