Spitzer IRS Observations of FU Orionis Objects
We present 5-35 km 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 and 20 km, and show water-vapor absorption bands...
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| Veröffentlicht in: | The Astrophysical journal 2006-09, Vol.648 (2), p.1099-1109 |
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| container_title | The Astrophysical journal |
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| creator | Green, J. D Hartmann, L Calvet, N Watson, D. M Ibrahimov, M Furlan, E Sargent, B Forrest, W. J |
| description | We present 5-35 km 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 and 20 km, and show water-vapor absorption bands at 5.8 and 6.8 km and SiO or possibly methane absorption at 8 km. 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 km is also consistent with such disks, and, for FU Orionis and BBW 76, longer wavelength emission may be fit by a model that includes moderate disk flaring. V1057 Cyg and V1515 Cyg have much more emission at longer wavelengths than the others, perhaps evidence of a substantial remnant of their natal, infalling envelopes. |
| doi_str_mv | 10.1086/505932 |
| format | Article |
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The continuum emission at 5-8 km is also consistent with such disks, and, for FU Orionis and BBW 76, longer wavelength emission may be fit by a model that includes moderate disk flaring. 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| title | Spitzer IRS Observations of FU Orionis Objects |
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