Observations are reported of the J = 2 → 1 transitions of CO and 12C18O at 230 and 219 GHz respectively from a number of galactic sources. A map of the central 1/2° × 1/2° of the Orion A molecular cloud is presented. The spectra are interpreted to derive molecular densities and abundance ratios in the molecular clouds observed.

Spectrograms of the variable star 48 Librae, taken near the last expected minimum, have been examined for irregularities of the shell line profiles. The asymmetries and the core-intensity of the strong shell lines suggest some kind of instability in the shell close to 1964. The harmonic spectral analyses of the acceleration and the radial velocity

Near infrared photometry is presented for the close eclipsing binaries R CMa, TX UMa, delta Lib, TV Cas, and AR Lac. The data are used to place limits on mass transfer rates.

The paper confirms the report of Kulkarni et al. (1979) who discovered IR bursts from the X-ray rapid burster, MXB1730-335. Two bursts at 2.2 microns, each of energy about 10 to the 31 J, and a new feature, several bright, brief flashes (delta t is less than 2s) superimposed on the burst continuum were observed. The brevity, luminosity and inferred

JHKLM photometry is presented for the close binary systems W UMa, U Sge and Beta-Lyr, and two systems, Eta-Gem and RR UMi, containing late-type variable components. The results are analyzed in terms of the constraints they place upon mass transfer.

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