This paper reports the discovery of a second type Ia supernova (SN 1992ac) in MCG 10-24-007 (IRAS 16362 + 5815), the parent galaxy of another type Ia supernova (SN 1992R). As seen from here, these two events must have occurred nearly simultaneously (separated by less than two months) as indicated by the appearance of their spectra. To our knowledge

Not Available

Not Available

Not Available

Spectrophotometric observations of OQ 208 over the time period between March 1985 and February 1991 are presented. It is found that the H-beta flux varies strongly over the period of observation. The peculiar profiles of the Balmer lines are variable, and their variations make it possible to place some unambiguous constraints on the broad line

We observed the λ 4232 Å CH+ interstellar line in the direction of the Sco OB 1 association (d ≃ 2 kpc) with the aim of detecting variations of the 12C/13C ratio at large distances from the Sun. The collection of 30 high-resolution spectra (λ/δλ = 1O5) of the V-6.3 stars HD 152235 and HD 152424 by means of the ESO 3.6m telescope allowed us to