Spectral observations of stars associated with nebulae. I. PP52, PP57, PP63, and PP89

摘要

Spectral observations of stars associated with nebulae, PP52, PP57, PP63, and PP89, are reported. The star PP52 is of spectral type A and is associated with a reflecting nebula. PP57 is a nonstationary star. A weak object (1079-0122733) immediately adjacent to PP57 is highly variable. It is shown that the nebulae PP63 and PP89 are cometary.