Spectrophotometry of type Ib/c SN 1997X: Hei lines near maximum light

Low resolution B&C+CCD (range 3600 ˚ A - 1.0 m) and high resolution Echelle+CCD (range 5800-8100 ˚ A) spec- trophotometry of type Ib/c SN 1997X near maximum light is presented and discussed. The supernova is notheworthy in hav- ing presented absorption lines of He I at early phases (at an expansion velocity of 11000 km sec 1 ). From the interstellar NaI D lines a reddening of EB V =0.180.02 mag has been de- rived, which arises in the host galaxy. From the emission lines of the underlying H II region, a density of Ne 100 and a velocity of RV=1098 3k m sec 1 are obtained.