Identification of Ionizing Sources and Young Stellar Objects in M17

Details Identification of Ionizing Sources and Young Stellar Objects in M17 Identification of Ionizing Sources and Young Stellar Objects in M17

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448l..45h&link_type=abstract

Astrophysical Journal Letters v.448, p.L45

Astronomy and Astrophysics

Astronomy

27

Ism: H Ii Regions, Infrared: Stars, Ism: Individual Messier Number: M17, Stars: Early-Type

Scientific paper

We have obtained high-quality 2 mu m (K-band) spectra of 25 stars in the direction of the heavily extincted, Galactic star-forming region M17. Interloping cool field giants are a potential source of confusion, but K-band spectra combined with normal JHK colors can identify and distinguish these stars via their strong CO absorption features at lambda >= 2.29 mu m. Among the other sources, we have identified five stars as O type from their spectral lines of H I, He I, He II, and N III by using a K-band classification system that we have developed. These provide the number of Lyman-continuum photons required by radio continuum observations. The remaining stellar objects, all but one with strong near-infrared (NIR) excesses, show completely different spectral characteristics from known main-sequence stars. Three are completely featureless throughout the K band, four (possibly five) show CO bands in emission, and two (candidate FU Orionis--like objects) have CO bands in absorption combined with extreme NIR excesses. We suggest that these stellar objects are relatively massive young stellar objects, still shrouded by circumstellar material.

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