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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693704.0, MPI für Astronomie / Publikationen_mpia
High-resolution infrared imaging and spectroscopy of the Z Canis Majoris system during quiescence and outburst
Authors:Hinkley, S.; Hillenbrand, L.; Oppenheimer, B. R.; Rice, E. L.; Pueyo, L.; Vasisht, G.; Zimmerman, N.; Kraus, A. L.; Ireland, M. J.; Brenner, D.; Beichman, C.; Dekany, R.; Roberts, J. E.; Parry, I. R.; Roberts, L. C.; Crepp, J. R.; Burruss, R.; Wallace, J. K.; Cady, E.; Zhai, C.; Shao, M.; Lockhart, T.; Soummer, R.; Sivaramakrishnan, A.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:The Astrophysical Journal Letters
Issue / Number:1
Start Page:id. L9 (5 pp)
Audience:Not Specified
Abstract / Description:We present adaptive optics photometry and spectra in the JHKL bands along with high spectral resolution K-band spectroscopy for each component of the Z Canis Majoris system. Our high angular resolution photometry of this very young (lsim1 Myr) binary, comprised of an FU Ori object and a Herbig Ae/Be star, was gathered shortly after the 2008 outburst while our high-resolution spectroscopy was gathered during a quiescent phase. Our photometry conclusively determines that the outburst was due solely to the embedded Herbig Ae/Be member, supporting results from earlier works, and that the optically visible FU Ori component decreased slightly (~30%) in luminosity during the same period, consistent with previous works on the variability of FU Ori type systems. Further, our high-resolution K-band spectra definitively demonstrate that the 2.294 μm CO absorption feature seen in composite spectra of the system is due solely to the FU Ori component, while a prominent CO emission feature at the same wavelength, long suspected to be associated with the innermost regions of a circumstellar accretion disk, can be assigned to the Herbig Ae/Be member. These findings clarify previous analyses of the origin of the CO emission in this complex system.
Free Keywords:binaries: close; instrumentation: adaptive optics; stars: individual: Z CMa; stars: pre-main sequence
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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