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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 660713.0, MPI für Astronomie / Publikationen_mpia
Spectral typing of late-type stellar companions to young stars from low-dispersion near-infrared integral field unit data
Authors:Roberts, L. C.; Rice, E. L.; Beichman, C. A.; Brenner, D.; Burruss, R.; Crepp, J. R.; Dekany, R. G.; Hillenbrand, L. A.; Hinkley, S.; Ligon, E. R.; Lockhart, T. G.; King, D.; Metchev, S.; Oppenheimer, B. R.; Parry, I. R.; Pueyo, L.; Roberts, J. E.; Shao, M.; Sivaramakrishnan, A.; Soummer, R.; Vasisht, G.; Vescelus, F. E.; Wallace, J. K.; Zimmerman, N. T.; Zhai, C.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astronomical Journal
Volume:144
Issue / Number:1
Start Page:id. 14
Audience:Not Specified
Abstract / Description:We used the Project 1640 near-infrared coronagraph and integral field spectrograph to observe 19 young solar-type stars. Five of these stars are known binary stars and we detected the late-type secondaries and were able to measure their JH spectra with a resolution of R ~ 30. The reduced, extracted, and calibrated spectra were compared to template spectra from the IRTF spectral library. With this comparison, we test the accuracy and consistency of spectral-type determination with the low-resolution near-infrared spectra from P1640. Additionally, we determine effective temperature and surface gravity of the companions by fitting synthetic spectra calculated with the PHOENIX model atmosphere code. We also present several new epochs of astrometry of each of the systems. Together, these data increase our knowledge and understanding of the stellar make up of these systems. In addition to the astronomical results, the analysis presented helps validate the Project 1640 data reduction and spectral extraction processes and the utility of low-resolution, near-infrared spectra for characterizing late-type companions in multiple systems.
Free Keywords:binaries: visual; instrumentation: adaptive optics; stars: individual: HD 77407 HD 91782 HD 112196 HD 129333 HD 135363; stars: late-type
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012AJ....144...14R
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