Summary of Discussion on Individual Objects

Abstract

A number of contributors had suggested the existence of high-velocity winds which presumably originates in the hot components. One possible piece of evidence was broad wings to Lyα. Kenyon opened the discussion by asking whether these wings indeed arose in a wind or merely reflected scattering processes. The absence of broad wings on other lines, Kwok noted, does not disprove a wind. Viotti did, however, caution that Lyα will be self-absorbed and have scattering wings, so that it is not the best choice. Furthermore, as Selvelli added, even isolated M giants show broad wings to Lyα (Johanssen & Jordan, 1986, Mon. Not. R. astr. Soc., 210, 239) with a redward shift of about 1 A, as seen in symbiotic stars. Schmid pointed out that Lyα could be scattered in a high-velocity neutral region illuminated by the ionized gas.