SIMBAD references

2008AJ....135.1421G - Astron. J., 135, 1421-1429 (2008/April-0)

High-resolution near-infrared spectroscopy of FUors and FUor-like stars.


Abstract (from CDS):

We present new high-resolution (R ≃ 18, 000) near-infrared spectroscopic observations of a sample of classical FU Orionis stars (FUors) and other young stars with FUor characteristics that are sources of Herbig-Haro (HH) flows. Spectra are presented for the region λ = 2.203-2.236 µm which is rich in absorption lines sensitive to both effective temperatures and surface gravities of stars. Both FUors and FUor-like stars show numerous broad and weak-unidentified spectral features in this region. Spectra of the 2.280-2.300 µm region are also presented, with the 2.2935 µm v = 2-0 CO absorption bandhead being clearly the strongest feature seen in the spectra of all FUors and FUor-like stars. A cross-correlation analysis shows that FUor and FUor-like spectra in the 2.203-2.236 µm region are not consistent with late-type dwarfs, giants, nor embedded protostars. The cross-correlations also show that the observed FUor-like HH energy sources have spectra that are substantively similar to those of FUors. Both object groups also have similar near-infrared colors. The large line widths and double-peaked nature of the spectra of the FUor-like stars are consistent with the established accretion disk model for FUors, also consistent with their near-infrared colors. It appears that young stars with FUor-like characteristics may be more common than projected from the relatively few known classical FUors.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - infrared: stars - stars: formation - stars: pre-main sequence - techniques: spectroscopic

Simbad objects: 33

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