SPECTRAL TYPING OF LATE-TYPE STELLAR COMPANIONS TO YOUNG STARS FROM LOW-DISPERSION NEAR-INFRARED INTEGRAL FIELD UNIT DATA

Journal Article · Sun Jul 15 00:00:00 EDT 2012 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/144/1/14· OSTI ID:22034427

Roberts, Lewis C; Beichman, Charles A; Burruss, Rick; Ligon, E Robert; Lockhart, Thomas G; Roberts, Jennifer E; Shao, Michael ^[1]; Rice, Emily L; Brenner, Douglas; Oppenheimer, Ben R ^[2]; Crepp, Justin R; Dekany, Richard G; Hillenbrand, Lynne A; Hinkley, Sasha ^[3]; King, David; Parry, Ian R ^[4]; Metchev, Stanimir ^[5]; Pueyo, Laurent; Sivaramakrishnan, Anand; Soummer, Remi ^[6] ; others, and

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1. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States)
2. American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States)
3. California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
4. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 OHA (United Kingdom)
5. Department of Physics and Astronomy, State University of New York, Stony Brook, NY 11794-3800 (United States)
6. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

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 {approx} 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.

• OSTI ID: 22034427
• Journal Information: Astronomical Journal (New York, N.Y. Online), Vol. 144, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTRONOMY
ASTROPHYSICS
BINARY STARS
COMPARATIVE EVALUATIONS
EMISSION SPECTROSCOPY
GRAVITATION
INFRARED SPECTRA
LIBRARIES
MAIN SEQUENCE STARS
NEAR INFRARED RADIATION
OPTICS
P CODES
RESOLUTION
STELLAR ATMOSPHERES