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High-resolution Infrared Imaging and Spectroscopy of the Z Canis Majoris System during Quiescence and Outburst

Hinkley, Sasha and Hillenbrand, Lynne and Oppenheimer, Ben R. and Rice, Emily L. and Pueyo, Laurent and Vasisht, Gautam and Zimmerman, Neil and Kraus, Adam L. and Ireland, Michael J. and Brenner, Douglas and Beichman, Charles and Dekany, Richard and Roberts, Jennifer E. and Parry, Ian R. and Roberts, Lewis C., Jr. and Crepp, Justin R. and Burruss, Rick and Wallace, J. Kent and Cady, Eric and Zhai, Chengxing and Shao, Michael and Lockhart, Thomas and Soummer, Rémi and Sivaramakrishnan, Anand (2013) High-resolution Infrared Imaging and Spectroscopy of the Z Canis Majoris System during Quiescence and Outburst. Astrophysical Journal Letters, 763 (1). Art. No. L9. ISSN 2041-8205. doi:10.1088/2041-8205/763/1/L9.

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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 (≾1 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hinkley, Sasha0000-0001-8074-2562
Oppenheimer, Ben R.0000-0001-7130-7681
Rice, Emily L.0000-0002-3252-5886
Pueyo, Laurent0000-0003-3818-408X
Vasisht, Gautam0000-0002-1871-6264
Zimmerman, Neil0000-0001-5484-1516
Kraus, Adam L.0000-0001-9811-568X
Ireland, Michael J.0000-0002-6194-043X
Beichman, Charles0000-0002-5627-5471
Roberts, Lewis C., Jr.0000-0003-3892-2900
Crepp, Justin R.0000-0003-0800-0593
Cady, Eric0000-0002-8789-2931
Zhai, Chengxing0000-0002-0291-4522
Soummer, Rémi0000-0003-2753-2819
Additional Information:© 2013 American Astronomical Society. Received 2012 August 2; accepted 2012 December 4; published 2012 December 28. This work was performed in part under contract with the California Institute of Technology (Caltech) funded by NASA through the Sagan Fellowship Program. A portion of this work was supported by the National Science Foundation under grant Nos. AST-1203023, AST-0804417, 0334916, 0215793, 0520822, and 1245018. A portion of the research in this Letter was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration, and was funded by internal Research and Technology Development funds. The authors thank Pat Hartigan for his help obtaining the Keck/NIRSPEC observations. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and NASA. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:binaries: close; instrumentation: adaptive optics; stars: individual (Z CMa); stars: pre-main sequence
Issue or Number:1
Record Number:CaltechAUTHORS:20130220-081342736
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Official Citation:High-resolution Infrared Imaging and Spectroscopy of the Z Canis Majoris System during Quiescence and Outburst Sasha Hinkley et al. 2013 ApJ 763 L9
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37007
Deposited By: Ruth Sustaita
Deposited On:20 Feb 2013 16:39
Last Modified:09 Nov 2021 23:26

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