HD 146875: a newly identified ZAMS active double-lined spectroscopic binary

Aims. We present a newly identified zero-age main-sequence (ZAMS) active double-lined spectroscopic binary, HD 146875, based the analysis of our 45 high-resolution spectra obtained between 2005 and 2008 at Xinglong Observatory, NAOC. Methods. From spectroscopic analysis and abundance analysis, we derived the accurate orbital parameters of the binary and determined the stellar atmospheric parameters of the two components. Results. Our results indicate that HD 146875 is a ZAMS active double-lined spectroscopic binary of age between 100 and 150 Myr. We derived the accurate orbital parameters of the binary and determined the stellar atmospheric parameters of the two components. The photometric observations taken in 2008 show a variation of about 0.057 mag caused by large spots most probably on the primary component of the binary rather than any ellipsoidal distortion. Furthermore, the radial velocity curve and the light curve imply that HD 146875 is already a synchronous system. We also studied the chromospheric activity of the components.