HD-133656 - A NEW HIGH-LATITUDE SUPERGIANT

In the course of our study of post-asymptotic Giant Branch objects, we discovered that the seventh magnitude A supergiant HD 133656 has an i nfrared excess emission due to cool circumstellar dust, and that its p hotospheric abundance pattern is population II like. We present a deta iled abundance study of the object, and discuss its nature in terms of post-AGE evolution: its galactic latitude, cold IR-excess, luminosity , abundances and photometric behaviour indicate HD 133656 to be a desc endant of the F-type high-latitude supergiants. The deficiencies of th e s-process elements are more difficult to understand in a post-AGB ev olutinary scenario.