Measurements of Starspot parameters on active stars using molecular bands in echelle spectra

摘要

We present results from a study of starspot areas (f_s) and temperatures(T_s), primarily on active, single-lined spectroscopic binaries, determined using molecular absorption bands. Expanding upon our previous studies. We have analyzed multiorder echelle spectra of eight systems to simultaneously measure several different molecular bands and chromospheric emission line. We determined starspot parameters by fitting the molecular bands of interest, using spectra of inactive G and K stars as proxies for the nonspotted photosphere of the active stars, and using spectra of M stars as proxies for the spots.