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Spatially resolved spectroscopy of infrared companions to T Tauri stars

Evidence for Ongoing Accretion

  • Part I: Disks—Observation
  • Conference paper
  • First Online:
Disks and Outflows Around Young Stars

Part of the book series: Lecture Notes in Physics ((LNP,volume 465))

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Abstract

We describe the technique of spatially resolved spectroscopy of close binary stars and present K band spectra of the Haro 6-10 and UY Aur infrared companion (IRC) systems. The IRC’s are characterized by very low infrared colour temperature and high luminosity. Our observations address the debate between those who suggest that the IRC’s are at an earlier evolutionary stage than their primary stars, and those who believe that these objects are relatively normal pre-main-sequence stars with substantial local extinction and accreting matter.

In both Haro 6-10 and UY Aur, we detect 2 μm molecular hydrogen emission confined to the infrared companions. The line ratios are consistent with shock heating, strengthening the view that the IRC’s are experiencing ongoing accretion. In the case of UY Aur, non-spherical geometry, such as accretion onto a circumstellar disk, can explain the presence of molecular hydrogen emission, low effective temperature, and high luminosity while allowing moderate extinction to the photosphere at near infrared wavelengths.

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Author information

Authors and Affiliations

  1. Max-Planck-Institut für Astronomie, Königstuhl 17, 69117, Heidelberg, Germany

    T. M. Herbst & Christoph Leinert

  2. Department of Astronomy, University of Texas, 78712-1083, Austin, Texas, USA

    C. D. Koresko

Authors
  1. T. M. Herbst
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  2. C. D. Koresko
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  3. Christoph Leinert
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Editor information

Steven Beckwith Jakob Staude Axel Quetz Antonella Natta

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© 1996 Springer-Verlag

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Herbst, T.M., Koresko, C.D., Leinert, C. (1996). Spatially resolved spectroscopy of infrared companions to T Tauri stars. In: Beckwith, S., Staude, J., Quetz, A., Natta, A. (eds) Disks and Outflows Around Young Stars. Lecture Notes in Physics, vol 465. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0102627

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  • DOI: https://doi.org/10.1007/BFb0102627

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-61389-3

  • Online ISBN: 978-3-540-68511-1

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