Spectroscopic Classification of IR-Excess IRAS Sources
American Astronomical Society
We have carried out classification spectroscopy (R~2000) of a sample of about 100 IRAS sources with excess flux at 20 microns. These were obtained with the KPNO 2.1 m and the Steward Observatory 2.3 m telescopes. Our main interest is the identification or confirmation of post-AGB objects. A number of them are indeed post-AGB, including proto-planetary nebulae. These range from K to B types, with the later showing hydrogen emission and in some cases other emission lines. Others appear to be M giants or main sequence stars, plus a couple of pre-main sequence stars. Some of the sample have previous classifications, which we list for comparison. The post-AGB stars are being monitored for light variability. This research has been supported by the NSF (most recently AST-1413660).
Willenbrink, Kathryn A.; Hrivnak, Bruce; Volk, Kevin; and Su, Kate Y.L., "Spectroscopic Classification of IR-Excess IRAS Sources" (2018). Physics and Astronomy Faculty Publications. 171.