An Infrared Study of Southern Be Stars: Ground-Based and Iras Observations

Radio observations of IRAS selected southern hemisphere classical Be stars

We present the first radio observations of a sample of 13 optically and IR bright southern hemisphere classical Be stars made from the Australian Telescope Compact Array at 3.5cm and 6.3cm simultaneously. One star, δ Cen was detected at 3.5cm and a second, µ Cen was also thought to have been detected; further observations of this source are required to confirm this detection. No sources were de...

IRAS Observations of Scuti Stars

Near-infrared Observations of Iras Minisurvey Galaxies

Near-infrared photometry at /, H, and K has been obtained for 82 galaxies from the IRAS minisurvey, a sample of infrared-selected galaxies. The near-infrared colors of these galaxies are similar to those of normal field spiral galaxies, but cover a larger range inJ — H and H — K. There is evidence of a tighter correlation between the nearand far-infrared emission than exists between the far-inf...

Molecular line observations of southern S stars

We observed a sample of southern S stars with the SEST telescope, in the SiO (v=0, J=3-2) transition at 130.3 GHz, and the HCN (J=1-0) transition at 88.6 GHz. SiO emission was detected in all seven stars observed, while HCN was detected in two. We employed a statistical equilibrium/radiative transfer model to estimate the SiO abundance for an assumed molecular distribution. The inferred SiO abu...

Infrared Observations of Large Amplitude Pulsating Stars

Our understanding of large amplitude pulsating stars and their status in stellar evolution is briefly reviewed. The paper then describes the near-infrared light curves of various asymptotic giant branch stars, concentrating on possible evidence for changing mass-loss rates. The stars discussed include oxygenand carbon-rich Miras, OH/IR stars, thick-shelled carbon stars and symbiotic Miras. Fina...