Mid-Infrared Photometry And Spectra Of Three High-Mass Protostellar Candidates At IRAS 18151-1208 And IRAS 20343+4129

Campbell, M. F.
Sridharan, T. K.
Beuther, H.
Lacy, John H.
Hora, J. L.
Zhu, Q.
Kassis, M.
Saito, M.
De Buizer, J. M.
Fung, S. H.
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We present arcsecond-scale mid-IR photometry ( in the 10.5 mu m N band and at 24.8 mu m), and low-resolution spectra in the N band ( R similar or equal to 100) of a candidate high-mass protostellar object ( HMPO) in IRAS 18151-1208 and of two HMPO candidates in IRAS 20343+4129, IRS 1 and IRS 3. In addition, we present high-resolution mid-IR spectra (R similar or equal to 80, 000) of the two HMPO candidates in IRAS 20343+4129. These data are fitted with simple models to estimate the masses of gas and dust associated with the mid-IR-emitting clumps, the column densities of overlying absorbing dust and gas, the luminosities of the HMPO candidates, and the likely spectral type of the HMPO candidate for which [Ne II] 12.8 mu m emission was detected ( IRAS 20343+4129 IRS 3). We suggest that IRAS 18151-1208 is a pre-ultracompact H II region HMPO, IRAS 20343+4129 IRS 1 is an embedded young stellar object with the luminosity of a B3 star, and IRAS 20343+4129 IRS 3 is a B2 ZAMS star that has formed an ultracompact H II region and disrupted its natal envelope.

Campbell, M. F., H. Beuther, J. H. Lacy, John L. Hora, Q. Zhu, M. Kassis, M. Saito, J. M. De Buizer, S. H. Fung, and L. C. Johnson. "Mid-Infrared Photometry and Spectra of Three High-Mass Protostellar Candidates at IRAS 18151ヨ1208 and IRAS 20343+ 4129." The Astrophysical Journal, Vol. 673, No. 2 (Feb., 2008): 954.