Circumstellar Structure Around Evolved Stars in the Cygnus-X Star Formation Region
AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
Pagination or Media Count:
We present observations of newly discovered 24 micron circumstellar structures detected with MIPS around three evolved stars in the Cygnus-X star-forming region. One of the objects, BD43 3710, has a bipolar nebula, possibly due to an outflow or a torus of material. A second, HBHA 4202-22, a Wolf-Rayet candidate, shows a circular shell of 24 micron emission suggestive of either a limb-brightened shell or disk seen face-on. No diffuse emission was detected around either of these two objects in the Spitzer 3.6-8 micron IRAC bands. The third object is the luminous blue variable candidate G79.290.46. We resolved the previously known inner ring in all four IRAC bands. The 24 micron emission from the inner ring extends 1 deg.2 beyond the shorter wavelength emission, well beyond what can be attributed to the difference in resolutions between MIPS and IRAC. Additionally, we have discovered an outer ring of 24 micron emission, possibly due to an earlier episode of mass loss. For the two shell stars, we present the results of radiative transfer models, constraining the stellar and dust shell parameters. The shells are composed of amorphous carbon grains, plus polycyclic aromatic hydrocarbons in the case of G79.290.46. Both G79.290.46 and HBHA 4202-22 lie behind the main Cygnus-X cloud. Although G79.290.46 simply may be on the far side of the cloud, HBHA 4202-22 is unrelated to the Cygnus-X star formation region.