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<i>Spitzer</i>IRS Observations of FU Orionis Objects

J. D. GreenDepartment of Physics and Astronomy, University of Rochester, Rochester, NY 14627L. HartmannDepartment of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109N. CalvetDepartment of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109D. M. WatsonDepartment of Physics and Astronomy, University of Rochester, Rochester, NY 14627M. IbrahimovUlugh Beg Astronomical Institute, Uzbek Academy of Sciences, Tashkent, UzbekistanE. FurlanCenter for Radiophysics and Space Research, Cornell University, Ithaca, NY 14853-6801B. SargentDepartment of Physics and Astronomy, University of Rochester, Rochester, NY 14627W. J. ForrestDepartment of Physics and Astronomy, University of Rochester, Rochester, NY 14627

The Astrophysical Journaljournal2006en

ABI

Annotatsiya

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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Mavzular

Astrophysics and Star Formation Studies Astronomy and Astrophysical Research Astro and Planetary Science

Identifikatorlar

DOI: 10.1086/505932

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