NGC 7538 IRS 1: A Forming O Star?

Details NGC 7538 IRS 1: A Forming O Star? NGC 7538 IRS 1: A Forming O Star?

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.7603l&link_type=abstract

American Astronomical Society, AAS Meeting #211, #76.03; Bulletin of the American Astronomical Society, Vol. 39, p.866

Astronomy and Astrophysics

Astronomy

Scientific paper

Because the Kelvin-Helmholtz contraction time for an OB star is shorter than the time for it to accrete its final mass, a massive star can initiate fusion and even approach the main sequence while still accreting its mass. Such a star might be recognized as a very compact source with broad ionic lines from an ionized inner accretion disk, and molecular absorption from the surrounding core and disk.
We have observed NGC 7538 IRS 1 with a high resolution mid-infrared spectrograph, TEXES, on Gemini North. Within IRS 1 we found an object that fits the description of a forming O star. The object is <0.25" in diameter, has a 100 km/s FWHM [Ne II] line, and has narrow molecular absorption lines.
This work was supported by NSF grant AST-0607312.

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