Near-infrared spectroscopy has identified one late-O type star named IRS 1A South, and 3 early B-type stars, IRS 2B, IRS 3A, and IRS 5.
近紅外線光譜已經確認出一顆晚期O型星，稱為IRS 1A南，和3顆早期B型星，IRS 2B、IRS 3A、和IRS 5。