arXiv subjects
Publications and source records attributed to R. Kotak.
We present preliminary results of the observational campaign on SN 2002er carried out by the European Supernova Collaboration (ESC). For this supernova the optical coverage from epochs -11 days to +50 days is excellent, both in imaging and spectroscopy. The extinction deduced from the photometry is E(B-V)=0.35, while Deltam15=1.31. In general SN 2002er behaves like a "normal" type Ia supernova, very similar to SN 1996X.
Spectroscopic observations of 51 Pegasi and tau Bootis show no periodic changes in the shapes of their line profiles; these results for 51 Peg are in significant conflict with those reported by Gray and Hatzes (1997). Our detection limits are small enough to rule out nonradial pulsations as the cause of the variability in tau Boo, but not in 51 Peg. The absence of line shape changes is consistent with these stars' radial velocity variability arising from planetary-mass companions.