SPECTROPHOTOMETRY OF TYPE IB C SN-1997X - HE-I LINES NEAR MAXIMUM LIGHT/

Low resolution B&C+CCD (range 3600 Angstrom - 1.0 mu m) and high resol ution Echelle+CCD (range 5800-8100 Angstrom) spectrophotometry of type Ib/c SN 1997X near maximum light is presented and discussed. The supe rnova is notheworthy in having presented absorption lines of He I at e arly phases (at an expansion velocity of 11000 km sec(-1)). From the i nterstellar NaI D lines a reddening of EB-V = 0.18+/-0.02 mag has been derived, which arises in the host galaxy. From the emission lines of the underlying H II region, a density of N-e less than or equal to 100 and a velocity of RV. = 1098 +/- 3 km sec(-1) are obtained.