Man

Keiichi Onaka

Associate Professor

UNIVERSIDAD CATOLICA DEL NORTE

Chile

Líneas de Investigación


Late stages of stellar evolution; Mass loss; Optical/infrared interferometry

Educación

  •  Doctoral Program, Department of Astronomy, UNIVERSITY OF TOKYO. Japón, 1997

Experiencia Académica

  •   Associate Professor Full Time

    UNIVERSIDAD CATOLICA DEL NORTE

    Chile

    2014 - At present

Experiencia Profesional

  •   Postdoctoral fellow

    Technische Universitaet Berlin

    Alemania

    1997 - 1999

  •   Postdoctoral fellow

    University of Tokyo

    Japón

    1999 - 2000

  •   Postdoctoral fellow

    Max Planck Institute for Radio Astronomy

    Alemania

    2000 - 2009

  •   Staff Astronomer

    Max Planck Institute for Radio Astronomy

    Alemania

    2009 - 2014


 

Article (83)

VLTI-MATISSE chromatic aperture-synthesis imaging of eta Carinae's stellar wind across the Br alpha line Periastron passage observations in February 2020
ALMA and VLA reveal the lukewarm chromospheres of the nearby red supergiants Antares and Betelgeuse
Infrared interferometric imaging of the compact dust disk around the AGB star HR3126 with the bipolar Toby Jug Nebula
Constraining Stellar Parameters and Atmospheric Dynamics of the Carbon AGB star V Oph
Exploring the innermost dust formation region of the oxygen-rich AGB star IK Tauri with VLT/SPHERE-ZIMPOL and VLTI/AMBER
Infrared Interferometric Three-dimensional Diagnosis of the Atmospheric Dynamics of the AGB Star R Dor with VLTI/AMBER
Spatially resolving the atmosphere of the non-Mira-Type AGB star SW Vir in near-infrared molecular and atomic lines with VLTI/AMBER ââ â
Spatially resolving the thermally inhomogeneous outer atmosphere of the red giant Arcturus in the 2.3 ? m CO lines
The close circumstellar environment of Betelgeuse V. Rotation velocity and molecular envelope properties from ALMA
ALMA observations of the nearby AGB star L-2 Puppis II. Gas disk properties derived from (CO)-C-12 and (CO)-C-13 J=3-2 emission
Clumpy dust clouds and extended atmosphere of the AGB star W Hydrae revealed with VLT/SPHERE-ZIMPOL and VLTI/AMBER II. Time variations between pre-maximum and minimum light
Vigorous atmospheric motion in the red supergiant star Antares
ALMA observations of the nearby AGB star L-2 Puppis I. Mass of the central star and detection of a candidate planet
Clumpy dust clouds and extended atmosphere of the AGB star W Hydrae revealed with VLT/SPHERE-ZIMPOL and VLTI/AMBER
VLTI-AMBER velocity-resolved aperture-synthesis imaging of eta Carinae with a spectral resolution of 12 000 Studies of the primary star wind and innermost wind-wind collision zone
AMBER-NACO aperture-synthesis imaging of the half-obscured central star and the edge-on disk of the red giant L-2 Puppis
The dust disk and companion of the nearby AGB star L-2 Puppis SPHERE/ZIMPOL polarimetric imaging at visible wavelengths
High spectral resolution spectroscopy of the SiO fundamental lines in red giants and red supergiants with VLT/VISIR
Imaging the outward motions of dumpy dust clouds around the red supergiant Antares with VLT/VISIR
Properties of the CO and H2O MOLsphere of the red supergiant Betelgeuse from VLTI/AMBER observations
High spectral resolution imaging of the dynamical atmosphere of the red supergiant Antares in the CO first overtone lines with VLTI/AMBER
New insights into the dust formation of oxygen-rich AGB stars
Spatially resolved, high-spectral resolution observation of the K giant Aldebaran in the CO first overtone lines with VLTI/AMBER
VLA survey of 22 GHz H2O masers toward ten silicate carbon stars (Research Note)
Detection of an asymmetry in the envelope of the carbon Mira R Fornacis using VLTI/MIDI
FIRST KECK NULLING OBSERVATIONS OF A YOUNG STELLAR OBJECT: PROBING THE CIRCUMSTELLAR ENVIRONMENT OF THE HERBIG Ae STAR MWC325
Spatially resolving the outer atmosphere of the M giant BK Virginis in the CO first overtone lines with VLTI/AMBER
AMBER observations of the AGB star RS Capricorni: extended atmosphere and comparison with stellar models
Imaging the dynamical atmosphere of the red supergiant Betelgeuse in the CO first overtone lines with VLTI/AMBER
Inhomogeneities in molecular layers of Mira atmospheres
Mid-infrared interferometric monitoring of evolved stars The dust shell around the Mira variable RR Aquilae at 13 epochs
A Mid-infrared Interferometric Study of the Circumstellar Environment of Dusty OH/IR Stars with VLTI/MIDI
Multi-epoch VLTI/MIDI Observations of the Carbon-rich Mira Star V Oph
Resolving the asymmetric inner wind region of the yellow hypergiant IRC+10420 with VLTI/AMBER in low and high spectral resolution mode
Resolving the Inner Active Accretion Disk Around the Herbig Be Star MWC 147 with VLTI/MIDI plus AMBER Spectro-interferometry
SiO maser emission in Miras
Spatially resolving the inhomogeneous structure of the dynamical atmosphere of Betelgeuse with VLTI/AMBER
Tracing the young massive high-eccentricity binary system theta(1)Orionis C through periastron passage
VLTI/AMBER unveils a possible dusty pinwheel nebula in WR118
Asymmetric silicate dust distribution toward the silicate carbon star BM Geminorum
Detection of an inner gaseous component in a Herbig Be star accretion disk: Near- and mid-infrared spectrointerferometry and radiative transfer modeling of MWC 147
Imaging the oxygen-rich disk toward the silicate carbon star EU Andromedae
J, H, K spectro-interferometry of the mira variable S Orionis
Near-IR bispectrum speckle interferometry, AO imaging polarimetry, and radiative transfer modeling of the proto-planetary nebula Frosty Leonis
Spatially resolved dusty torus toward the red supergiant WOH G64 in the Large Magellanic Cloud
The close circumstellar environment of the semi-regular S-type star pi(1) Gruis
AMBER, the near-infrared spectro-interferometric three-telescope VLTI instrument
AMBER/VLTI and MIDI/VLTI spectro-interferometric observations of the B[e] supergiant CPD-57 degrees 2874 - Size and geometry of the circumstellar envelope in the near- and mid-IR
An asymmetry detected in the disk of kappa canis majoris with AMBER/VLTI
Constraining the wind launching region in Herbig Ae stars: AMBER/VLTI spectroscopy of HD 104237
Direct constraint on the distance of gamma(2) Velorum from AMBER/VLTI observations
Disk and wind interaction in the young stellar object MWC297 spatially resolved with AMBER/VLTI
Interferometric data reduction with AMBER/VLTI. Principle, estimators, and illustration
Near-infrared interferometry of eta Carinae with spectral resolutions of 1 500 and 12 000 using AMBER/VLTI
Near-infrared polarimetric study of the bipolar nebula IRAS 19312+1950
Optical configuration and analysis of the AMBER/VLTI instrument
Temporal variations of the outer atmosphere and the dust shell of the carbon-rich Mira variable V Ophiuchi probed with VLTI/MIDI
The Mira variable S Orionis: relationships between the photosphere, molecular layer, dust shell, and SiO maser shell at 4 epochs
Visual/infrared interferometry of Orion Trapezium stars: preliminary dynamical orbit and aperture synthesis imaging of the theta(1) Orionis C system
VLTI's view on the circumstellar environment of cool evolved stars
Comparison of dynamical model atmospheres of Mira variables with mid-infrared interferometric and spectroscopic observations
High angular resolution N-band observation of the silicate carbon star IRAS08002-3803 with the VLTI/MIDI instrument - Dusty environment spatially resolved
Radiative transfer modeling of three-dimensional clumpy AGN tori and its application to NGC 1068
Mid-infrared interferometry of the Mira variable RR Sco with the VLTI MIDI instrument
Interferometric observations of the Mira star o Ceti with the VLTI/VINCI instrument in the near-infrared
Warm water vapor envelope in Mira variables and its effects on the apparent size from the near-infrared to the mid-infrared
Warm water vapor envelope in the supergiants alpha Ori and alpha Her and its effects on the apparent size from the near-infrared to the mid-infrared
JHK '-band IOTA interferometry of the circumstellar environment of R CrB
Diffraction-limited speckle interferometry and modeling of the circumstellar envelope of R CrB at maximum and minimum light
Elemental abundances of carbon, nitrogen, and oxygen in carbon stars
Infrared spectra of carbon stars observed by the ISO SWS bands at 14 micron. II. HCN and C2H2
Quantitative analysis of carbon isotopic ratios in carbon stars. III. 26 J-type carbon stars including 5 silicate carbon stars
Warm dust in the cool brown dwarf Gliese 229B and spectroscopic diagnosis of dusty photospheres
Analysis of Infrared Spectra of Carbon Stars Observed by the ISO SWS
Detection of fine-structure line emission from carbon-rich and oxygen-rich AGB stars by the ISO SWS
Infrared Emissions from Metals in Carbon Stars and M Giant
Infrared spectra of carbon stars observed by the ISO SWS. I. Molecular absorption in N-type and SC-type stars
Molecules of Non-Photospheric Origin in Red Giants and Supergiants Revealed by the ISO SWS
Quantitative analysis of carbon isotopic ratios in carbon stars. II. The effect of model atmosphere on the iso-intensity method
Dust formation in stellar photospheres: a case of very low mass stars and a possible resolution on the effective temperature scale of M dwarfs
Evolution of dusty photospheres through red to brown dwarfs: how dust forms in very low mass objects
Quantitative analysis of carbon isotopic ratios in carbon stars. I. 62 N-type and 15 SC-type carbon stars.
High resolution infrared spectra of silicon monoxide and silicon isotopic abundances in cool luminous stars

Proyecto (6)

Resolving the mass loss from stars in late evolutionary stages by high spatial resolution observations from the visible to the infrared to the millimeter domain
Resolving the mass loss from stars in late evolutionary stages by high spatial resolution observations
Resolving the mass loss from stars in late evolutionary stages with the Very Large Telescope Interferometer
Spatially resolving the inner wind region of stars in late evolutionary stages with VLT and VLTI
Observational Study of the Outer Atmosphere and the Circumstellar Envelope of Cool Evolved Stars
A joint effort to study the evolution of the close environment of the red-supergiant star Betelgeuse in the near IR
84
Keiichi Onaka

Associate Professor

UNIVERSIDAD CATOLICA DEL NORTE

Chile

1
Christian Adam

Post-doctoral researcher

Institute for Physics and Astronomy

Universidad de Valparaíso

Valparaiso, Chile

1
Alexandre Gallenne

Fellow

Astronomy

UNIVERSIDAD DE CONCEPCION, DEPARTAMENTO DE ASTRONOMÍA, FACULTAD DE CIENCIAS FÍSICAS Y MATEMÁTICAS

concepción, Chile