The Wolf-Rayet features and mass-metallicity relation of long-duration gamma-ray burst host galaxies

X. H. Han, F. Hammer, Y. C. Liang +4

Aims. We have gathered optical spectra of 8 long-duration GRB host galaxies selected from the archival data of VLT/FORS2. We investigated whether or not Wolf-Rayet (WR) stars can b…