Morningstar raises fair value estimate for Northern Star, sees higher bid for firm
** Morningstar raises its fair value estimate for Australia's Northern Star Resources NST.AX to A$20.50 per share after the gold miner rejected a conditional, non-binding proposal from Gold Fields GFIJ.J
** Investment research firm says Northern Star remains "in play" and a higher offer is likely
** Says the gold miner has also rebuffed a number of approaches regarding potential transactions over the past year
** Six of 15 analysts rate the stock "buy" or higher, nine "hold"; median PT is A$25.65 - LSEG data
** Shares down 12.9% YTD