Spitzer-IRS Observations of FU Orionis Objects

Details Spitzer-IRS Observations of FU Orionis Objects Spitzer-IRS Observations of FU Orionis Objects

2006-05-15

arxiv.org/abs/astro-ph/0605365v1

Astrophys.J.648:1099-1109,2006

Astronomy and Astrophysics

Astrophysics

30 pages, 8 figures, accepted by ApJ

Scientific paper

10.1086/505932

We present 5-35 $\mu$m spectra, taken with the Infrared Spectrograph (IRS) on the Spitzer Space Telescope, of five FU Orionis objects: FU Ori, V1515 Cyg, V1057 Cyg, BBW 76, and V346 Nor. All but V346 Nor reveal amorphous silicate grains in emission at 10 $\mu$m and 20 $\mu$m, and show water-vapor absorption bands at 5.8 and 6.8 $\mu$m and SiO or possibly methane absorption at 8 $\mu$m. These absorption features closely match these bands in model stellar photospheres -- signs of the gaseous photospheres of the inner regions of these objects' accretion disks. The continuum emission at 5-8 $\mu$m is also consistent with such disks, and, for FU Orionis and BBW 76, longer-wavelength emission may be fit by a model which includes moderate disk flaring. V1057 Cyg and V1515 Cyg have much more emission at longer wavelengths than the others, perhaps evidence of substantial remnant of their natal, infalling envelopes.

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