Long-term Infrared Variability of FU Oriand EX Lup-type Stars

Details Long-term Infrared Variability of FU Oriand EX Lup-type Stars Long-term Infrared Variability of FU Oriand EX Lup-type Stars

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20913304k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #133.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

FU Orionisand EX Lupi-type stars are low-mass pre-main sequence stars exhibiting large, 5 mag optical outbursts powered by enhanced accretion from the circumstellar disk to the star. We investigate the brightness evolution of these stars in the nearto far-infrared wavelength regime, where the emission is dominated by the circumstellar material. We utilize Spitzer data to obtain the spectral energy distribution (SED) of the stars, and compare these SEDs with ones derived from IRAS, ISO, MSX, 2MASS and ground-based measurements taken in the last 25 years. We report, for the first time, clear flux changes at infrared wavelengths for several targets. The observed flux variations help us to gather information on the structure and energetics of the circumstellar material and to clarify its role in the eruption.

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