Near-infrared spectroscopy of moderate luminosity sources: OMC-2 IRS 3 and IRS 4

摘要: The two brighter near-infrared sources in Orion Molecular Cloud 2, IRS 3 and 4, were observed at moderate spectral resolution the near-infrared. At least eight members of V = 1 ..-->.. 0 2 rotation-vibration series H/sub 2/ found 4. line ratios intensities argue that source is shock-excited with an excitation temperature T/sub ex/ 3000 +- 800 K. Ultraviolet pumping appears unlikely, but perhaps not by a large factor. values determined for extinction 4 are consistent previous determinations middle B ZAMS object, extinguished 10--15 visual magnitudes. region emission, however, more probably 20--30