▁from ▁Hi pp ar cos . ▁ ▁The ▁spectrum ▁of ▁ 5 ▁Lac ert ae ▁clearly ▁indicates ▁both ▁a ▁hot ▁component ▁and ▁a ▁cool er ▁component , ▁recogn ised ▁even ▁in ▁early ▁spect ra . ▁ ▁Pub lished ▁spectral ▁types ▁for ▁the ▁br ighter ▁cool ▁component ▁vary ▁from ▁K 4 ▁to ▁M 0 , ▁with ▁a ▁lum inos ity ▁class ▁of ▁giant ▁or ▁super gi ant . ▁ ▁The ▁hot ter ▁star ▁is ▁generally ▁class ed ▁as ▁a ▁relatively ▁une vol ved ▁late ▁B ▁or ▁early ▁A ▁star , ▁but ▁an ▁autom ated ▁classification ▁program ▁gave ▁it ▁a ▁spectral ▁class ▁of ▁B 2 V . ▁ ▁Rad ial ▁velocity ▁variations ▁in ▁the ▁absor ption ▁lines ▁from ▁the ▁two ▁separate ▁stars ▁have ▁been ▁measured ▁to ▁determine ▁the ▁orbit . ▁ ▁This ▁has ▁an ▁unus ually ▁long ▁period ▁of ▁almost ▁ 4 2 ▁years . ▁ ▁The ▁two ▁stars ▁have ▁an ▁ecc ent ric ▁orbit ▁with ▁a ▁project ed ▁axis ▁of ▁about ▁ 1 5 ▁au . ▁ ▁References ▁ ▁Category : L ac erta ▁( const ell ation ) ▁Category : K - type ▁super gi ants ▁Category : B - type ▁main - sequence ▁stars ▁Category : S low ▁irregular ▁variables ▁Category : S pect ro scop ic ▁bin aries ▁Lac ert ae , ▁ 0 5 ▁Lac ert ae , ▁V 4 1 2 ▁Category : D urch m uster ung ▁objects ▁ 1 1 1 0 2 2 ▁ 8 5 7 2 ▁ 2 1 3 3 1 0 ▁