▁as ▁West er l und ▁ 1 , ▁published ▁in ▁ 1 9 8 7 ▁and ▁number ed ▁the ▁stars , ▁giving ▁the ▁number ▁ 2 6 ▁and ▁the ▁spectral ▁type ▁M 2 I . ▁West er l und ▁also ▁discovered ▁another ▁notable ▁cool ▁hyper gi ant ▁star , ▁W OH ▁G 6 4 , ▁found ▁in ▁the ▁Lar ge ▁Mag ellan ic ▁Cloud ▁in ▁the ▁const ell ation ▁Dor ado . ▁ ▁Modern ▁termin ology ▁st ems ▁from ▁ 1 9 9 8 ▁when ▁the ▁cluster ▁was ▁referred ▁to ▁as ▁West er l und ▁ 1 ▁( W d 1 ), ▁with ▁a ▁paper ▁describing ▁Ara ▁A ▁as ▁star ▁ 2 6 ▁and ▁Ara ▁C ▁as ▁star ▁ 9 . ▁ ▁Phys ical ▁characteristics ▁West er l und ▁ 1 - 2 6 ▁is ▁class ified ▁as ▁a ▁l umin ous ▁cool ▁super gi ant . ▁It ▁occup ies ▁the ▁upper ▁right ▁corner ▁of ▁the ▁H ert z spr ung – Russ ell ▁diagram . ▁The ▁cool ▁temperature ▁means ▁it ▁em its ▁most ▁of ▁its ▁energy ▁in ▁the ▁inf ra red ▁spectrum . ▁It ▁also ▁shows ▁huge ▁mass ▁loss ▁of ▁atmos pher ic ▁material , ▁suggesting ▁that ▁it ▁may ▁further ▁evol ve ▁into ▁a ▁hot ter ▁super gi ant . ▁West er l und ▁ 1 - 2 6 ▁has ▁been ▁observed ▁to ▁change ▁its ▁spectral ▁class ▁( and ▁thus ▁its ▁temperature ) ▁during ▁several ▁periods , ▁but ▁it ▁has ▁not ▁been ▁seen ▁to ▁change ▁its ▁lum inos ity . ▁ ▁The