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Keiichi Onaka

Associate Professor

UNIVERSIDAD CATOLICA DEL NORTE

Chile

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

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

Associate Professor Full Time

UNIVERSIDAD CATOLICA DEL NORTE

Chile

2014 - A la fecha

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


An impressionist view of V Hydrae Planquart, L.; Paladini, C.; Jorissen, A.; Escorza, A.; Pantin, E.; Drevon, J.; Aringer, B.; Baron, F.; Chiavassa, A.; Cruzalebes, P.; et al. Article ISI ASTRONOMY & ASTROPHYSICS (2024)
Contemporaneous high-angular-resolution imaging of the AGB star W Hya in vibrationally excited H2O lines and visible polarized light with ALMA and VLT/SPHERE-ZIMPOL Ohnaka K.; Wong, K. T.; Weigelt, G.; Hofmann, K. -h. Article ISI ASTRONOMY & ASTROPHYSICS (2024)
Imaging the innermost circumstellar environment of the red supergiant WOH G64 in the Large Magellanic Cloud Ohnaka K.; Hofmann, K. -h.; Weigelt, G.; van Loon, J. Th.; Schertl, D.; Goldman, S. R. Article ISI ASTRONOMY & ASTROPHYSICS (2024)
VLTI-MATISSE chromatic aperture-synthesis imaging of eta Carinae's stellar wind across the Br alpha line Periastron passage observations in February 2020 Berio, Ph.; Russell, C. M. P.; Gull, T. R.; Corcoran, M. F.; Damineli, A.; Morris, P. W.; Hummel, C. A.; Espinoza-Galeas, D. A.; Stevens, I. R.; Augereau, J. -C.; et al. Article ISI ASTRONOMY & ASTROPHYSICS (2021)
ALMA and VLA reveal the lukewarm chromospheres of the nearby red supergiants Antares and Betelgeuse Article ISI ASTRONOMY & ASTROPHYSICS (2020)
Infrared interferometric imaging of the compact dust disk around the AGB star HR3126 with the bipolar Toby Jug Nebula Article ISI ASTRONOMY & ASTROPHYSICS (2020)
Constraining Stellar Parameters and Atmospheric Dynamics of the Carbon AGB star V Oph Airapetian V.; Carpenter K.G. Article ISI SCOPUS ASTROPHYSICAL JOURNAL (2019)
Exploring the innermost dust formation region of the oxygen-rich AGB star IK Tauri with VLT/SPHERE-ZIMPOL and VLTI/AMBER Article ISI SCOPUS ASTRONOMY AND ASTROPHYSICS (2019)
Infrared Interferometric Three-dimensional Diagnosis of the Atmospheric Dynamics of the AGB Star R Dor with VLTI/AMBER Hofmann, K. -h. Article ISI SCOPUS ASTROPHYSICAL JOURNAL (2019)
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 Hadjara M.; Maluenda Berna M.Y.L. Article ISI SCOPUS Astronomy and Astrophysics (2019)
Spatially resolving the thermally inhomogeneous outer atmosphere of the red giant Arcturus in the 2.3 ? m CO lines Ohnaka K.; Morales MarÃn C.A.L. Article ISI SCOPUS Astronomy and Astrophysics (2018)
The close circumstellar environment of Betelgeuse V. Rotation velocity and molecular envelope properties from ALMA Article ISI SCOPUS ASTRONOMY AND ASTROPHYSICS (2018)
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 Homan W. Article ISI SCOPUS ASTRONOMY AND ASTROPHYSICS (2017)
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 Article ISI SCOPUS ASTRONOMY AND ASTROPHYSICS (2017)
Vigorous atmospheric motion in the red supergiant star Antares Article ISI SCOPUS NATURE (2017)
ALMA observations of the nearby AGB star L-2 Puppis I. Mass of the central star and detection of a candidate planet Article ISI SCOPUS ASTRONOMY AND ASTROPHYSICS (2016)
Clumpy dust clouds and extended atmosphere of the AGB star W Hydrae revealed with VLT/SPHERE-ZIMPOL and VLTI/AMBER Ohnaka K.; Weigelt, G.; Hofmann, K. -h. Article ISI SCOPUS ASTRONOMY AND ASTROPHYSICS (2016)
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 Clementel, N; Madura, T Article ISI SCOPUS ASTRONOMY AND ASTROPHYSICS (2016)
AMBER-NACO aperture-synthesis imaging of the half-obscured central star and the edge-on disk of the red giant L-2 Puppis Ohnaka K.; Schertl, D.; Hofmann, KH; Weigelt, G. Article ISI SCOPUS Astronomy and Astrophysics (2015)
The dust disk and companion of the nearby AGB star L-2 Puppis SPHERE/ZIMPOL polarimetric imaging at visible wavelengths Kervella P.; Montarges, M.; Lagadec E.; Ridgway, ST; Haubois X.; Girard, JH; Ohnaka K.; Perrin G.; Gallenne A. Article ISI SCOPUS Astronomy and Astrophysics (2015)
High spectral resolution spectroscopy of the SiO fundamental lines in red giants and red supergiants with VLT/VISIR Article ISI ASTRONOMY & ASTROPHYSICS (2014)
Imaging the outward motions of dumpy dust clouds around the red supergiant Antares with VLT/VISIR Ohnaka K. Article ISI ASTRONOMY & ASTROPHYSICS (2014)
Properties of the CO and H2O MOLsphere of the red supergiant Betelgeuse from VLTI/AMBER observations Montarges, M.; Kervella P.; Perrin G.; Ohnaka K.; Chiavassa, A.; Ridgway, ST; Lacour S. Article ISI ASTRONOMY & ASTROPHYSICS (2014)
High spectral resolution imaging of the dynamical atmosphere of the red supergiant Antares in the CO first overtone lines with VLTI/AMBER Ohnaka K.; Hofmann, KH; Schertl, D.; Weigelt, G.; Baffa, C.; Chelli A.; Petrov, R; Robbe-Dubois, S Article ISI ASTRONOMY & ASTROPHYSICS (2013)
New insights into the dust formation of oxygen-rich AGB stars Karovicova, I.; Wittkowski, M.; Ohnaka K.; Boboltz, DA; Fossat, E.; Scholz M. Article ISI ASTRONOMY & ASTROPHYSICS (2013)
Spatially resolved, high-spectral resolution observation of the K giant Aldebaran in the CO first overtone lines with VLTI/AMBER Ohnaka K. Article ISI ASTRONOMY & ASTROPHYSICS (2013)
VLA survey of 22 GHz H2O masers toward ten silicate carbon stars (Research Note) Boboltz, D. A.; Mulitz-Schimel, G. Article ISI ASTRONOMY & ASTROPHYSICS (2013)
Detection of an asymmetry in the envelope of the carbon Mira R Fornacis using VLTI/MIDI Sacuto, S.; Klotz, D.; Nowotny, W. Article ISI ASTRONOMY & ASTROPHYSICS (2012)
FIRST KECK NULLING OBSERVATIONS OF A YOUNG STELLAR OBJECT: PROBING THE CIRCUMSTELLAR ENVIRONMENT OF THE HERBIG Ae STAR MWC325 Ragland, S.; Ridgway, S. T.; Colavita, M. M.; Akeson, R. L.; Danchi, W. C.; Hrynevich, M.; Traub, W. A. Article ISI ASTROPHYSICAL JOURNAL (2012)
Spatially resolving the outer atmosphere of the M giant BK Virginis in the CO first overtone lines with VLTI/AMBER Ohnaka K.; Hofmann, KH; Schertl, D.; Weigelt, G.; Malbet, F.; Massi F.; Meilland, A; Stee P. Article ISI ASTRONOMY & ASTROPHYSICS (2012)
AMBER observations of the AGB star RS Capricorni: extended atmosphere and comparison with stellar models Marcaide, J. M.; Guirado, J. C. Article ISI ASTRONOMY & ASTROPHYSICS (2011)
Imaging the dynamical atmosphere of the red supergiant Betelgeuse in the CO first overtone lines with VLTI/AMBER Ohnaka K.; Weigelt, G.; Millour, F; Hofmann, KH; Driebe T.; Schertl, D.; Chelli A.; Massi F.; Petrov, R; Stee P. Article ISI ASTRONOMY & ASTROPHYSICS (2011)
Inhomogeneities in molecular layers of Mira atmospheres Wittkowski, M.; Boboltz, DA; Ireland M.; Karovicova, I.; Ohnaka K.; Scholz M.; van Wyk, F; Whitelock, P; Wood, PR; Zijlstra, AA Article ISI ASTRONOMY & ASTROPHYSICS (2011)
Mid-infrared interferometric monitoring of evolved stars The dust shell around the Mira variable RR Aquilae at 13 epochs Karovicova, I.; Fossat, E. Article ISI ASTRONOMY & ASTROPHYSICS (2011)
A Mid-infrared Interferometric Study of the Circumstellar Environment of Dusty OH/IR Stars with VLTI/MIDI de Souza, A. Domiciano; Moorwood, A Article ISI LABYRINTH OF STAR FORMATION (2009)
Multi-epoch VLTI/MIDI Observations of the Carbon-rich Mira Star V Oph Wittkowski, A.; Moorwood, A Article ISI LABYRINTH OF STAR FORMATION (2009)
Resolving the asymmetric inner wind region of the yellow hypergiant IRC+10420 with VLTI/AMBER in low and high spectral resolution mode Driebe T.; Groh, JH; Hofmann, KH; Ohnaka K.; Kraus S.; Millour, F; Murakawa, K.; Schertl, D.; Weigelt, G.; Petrov, R; et al. Article ISI SCOPUS ASTRONOMY & ASTROPHYSICS (2009)
Resolving the Inner Active Accretion Disk Around the Herbig Be Star MWC 147 with VLTI/MIDI plus AMBER Spectro-interferometry Preibisch, Th.; Moorwood, A Article ISI LABYRINTH OF STAR FORMATION (2009)
SiO maser emission in Miras Gray, M. D.; Humphreys, E. M. L.; Boboltz, D. Article ISI MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2009)
Spatially resolving the inhomogeneous structure of the dynamical atmosphere of Betelgeuse with VLTI/AMBER Stee, Ph. Article ISI ASTRONOMY & ASTROPHYSICS (2009)
Tracing the young massive high-eccentricity binary system theta(1)Orionis C through periastron passage Balega, Y. Y.; Docobo, J. A.; Preibisch, T.; Tamazian, V. S. Article ISI ASTRONOMY & ASTROPHYSICS (2009)
VLTI/AMBER unveils a possible dusty pinwheel nebula in WR118 Chesneau, O.; Groh, J. H.; Hofmann, K. -h.; Murakawa, K.; Schertl, D. Article ISI ASTRONOMY & ASTROPHYSICS (2009)
Asymmetric silicate dust distribution toward the silicate carbon star BM Geminorum Leinert, Ch. Article ISI ASTRONOMY & ASTROPHYSICS (2008)
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 Kraus, Stefan; Preibisch, Thomas; Ohnaka, Keiichi Article ISI ASTROPHYSICAL JOURNAL (2008)
Imaging the oxygen-rich disk toward the silicate carbon star EU Andromedae Article ISI ASTRONOMY AND ASTROPHYSICS (2008)
J, H, K spectro-interferometry of the mira variable S Orionis Le Bouquin, J. -B. Article ISI ASTRONOMY AND ASTROPHYSICS (2008)
Near-IR bispectrum speckle interferometry, AO imaging polarimetry, and radiative transfer modeling of the proto-planetary nebula Frosty Leonis Oya, S. Article ISI ASTRONOMY & ASTROPHYSICS (2008)
Spatially resolved dusty torus toward the red supergiant WOH G64 in the Large Magellanic Cloud Article ISI ASTRONOMY & ASTROPHYSICS (2008)
The close circumstellar environment of the semi-regular S-type star pi(1) Gruis Cruzalebes, P. Article ISI ASTRONOMY & ASTROPHYSICS (2008)
AMBER, the near-infrared spectro-interferometric three-telescope VLTI instrument Article ISI ASTRONOMY & ASTROPHYSICS (2007)
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 Miroshnichenko, A. S.; Preisbisch, T. Article ISI ASTRONOMY & ASTROPHYSICS (2007)
An asymmetry detected in the disk of kappa canis majoris with AMBER/VLTI Jankov, S.; Scholler, M. Article ISI ASTRONOMY & ASTROPHYSICS (2007)
Constraining the wind launching region in Herbig Ae stars: AMBER/VLTI spectroscopy of HD 104237 Article ISI ASTRONOMY & ASTROPHYSICS (2007)
Direct constraint on the distance of gamma(2) Velorum from AMBER/VLTI observations Petrov, R. G.; Bonneau, D.; Tallon, M.; Thiebaut, E.; Malbet, F.; Antonelli, P.; Beckmann, U.; Bresson, Y.; Dugue, M.; Gennari, S.; et al. Article ISI ASTRONOMY AND ASTROPHYSICS (2007)
Disk and wind interaction in the young stellar object MWC297 spatially resolved with AMBER/VLTI de Wit, W. -J.; Berger, J. -P. Article ISI ASTRONOMY & ASTROPHYSICS (2007)
Interferometric data reduction with AMBER/VLTI. Principle, estimators, and illustration Article ISI ASTRONOMY & ASTROPHYSICS (2007)
Near-infrared interferometry of eta Carinae with spectral resolutions of 1 500 and 12 000 using AMBER/VLTI Hillier, D. J.; Gull, T.; Davidson, K.; Agabi, K.; Weis, K. Article ISI ASTRONOMY & ASTROPHYSICS (2007)
Near-infrared polarimetric study of the bipolar nebula IRAS 19312+1950 Nakashima, J.; Deguchi, S. Article ISI ASTRONOMY & ASTROPHYSICS (2007)
Optical configuration and analysis of the AMBER/VLTI instrument Salinari, P.; Delage, L. Article ISI ASTRONOMY AND ASTROPHYSICS (2007)
Temporal variations of the outer atmosphere and the dust shell of the carbon-rich Mira variable V Ophiuchi probed with VLTI/MIDI Article ISI ASTRONOMY & ASTROPHYSICS (2007)
The Mira variable S Orionis: relationships between the photosphere, molecular layer, dust shell, and SiO maser shell at 4 epochs Article ISI ASTRONOMY AND ASTROPHYSICS (2007)
Visual/infrared interferometry of Orion Trapezium stars: preliminary dynamical orbit and aperture synthesis imaging of the theta(1) Orionis C system Monnier, J. D.; Schloerb, F. P. Article ISI ASTRONOMY & ASTROPHYSICS (2007)
VLTI's view on the circumstellar environment of cool evolved stars Article ISI NEW ASTRONOMY REVIEWS (2007)
Comparison of dynamical model atmospheres of Mira variables with mid-infrared interferometric and spectroscopic observations Wood, PR Article ISI ASTRONOMY & ASTROPHYSICS (2006)
High angular resolution N-band observation of the silicate carbon star IRAS08002-3803 with the VLTI/MIDI instrument - Dusty environment spatially resolved Hofmann, KH; Leinert, C.; Morel, S; Paresce, F; Waters, LBFM Article ISI ASTRONOMY AND ASTROPHYSICS (2006)
Radiative transfer modeling of three-dimensional clumpy AGN tori and its application to NGC 1068 Honig, SF; Beckert, T Article ISI ASTRONOMY & ASTROPHYSICS (2006)
Mid-infrared interferometry of the Mira variable RR Sco with the VLTI MIDI instrument Bergeat, J; Graser, U.; Hofmann, KH; Kohler, R; Leinert, C.; Paresce, F Article ISI ASTRONOMY & ASTROPHYSICS (2005)
Interferometric observations of the Mira star o Ceti with the VLTI/VINCI instrument in the near-infrared Woodruff, HC; Hofmann, KH; Wood, PR Article ISI ASTRONOMY & ASTROPHYSICS (2004)
Warm water vapor envelope in Mira variables and its effects on the apparent size from the near-infrared to the mid-infrared Article ISI ASTRONOMY & ASTROPHYSICS (2004)
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 Article ISI ASTRONOMY & ASTROPHYSICS (2004)
JHK '-band IOTA interferometry of the circumstellar environment of R CrB Berger J.P.; Hofmann, KH; Lacasse, MG; Monnier, JD; Schloerb, FP; Traub, WA; Yudin, BF Article ISI ASTRONOMY & ASTROPHYSICS (2003)
Diffraction-limited speckle interferometry and modeling of the circumstellar envelope of R CrB at maximum and minimum light Balega, Y; Blocker, T; Efimov, YS; Hofmann, KH Article ISI ASTRONOMY & ASTROPHYSICS (2001)
Elemental abundances of carbon, nitrogen, and oxygen in carbon stars Tsuji, T.; Aoki, W. Article ASTRONOMY AND ASTROPHYSICS (2000)
Infrared spectra of carbon stars observed by the ISO SWS bands at 14 micron. II. HCN and C2H2 Article ASTRONOMY AND ASTROPHYSICS (1999)
Quantitative analysis of carbon isotopic ratios in carbon stars. III. 26 J-type carbon stars including 5 silicate carbon stars Ohnaka,K., Tsuji, T. Article ASTRONOMY AND ASTROPHYSICS (1999)
Warm dust in the cool brown dwarf Gliese 229B and spectroscopic diagnosis of dusty photospheres Article ISI ASTROPHYSICAL JOURNAL (1999)
Analysis of Infrared Spectra of Carbon Stars Observed by the ISO SWS Ohnaka, K., Tsuji, T., Aoki, W., Yamamura, I. Article ASTROPHYSICS AND SPACE SCIENCE (1998)
Detection of fine-structure line emission from carbon-rich and oxygen-rich AGB stars by the ISO SWS Article ASTRONOMY AND ASTROPHYSICS (1998)
Infrared Emissions from Metals in Carbon Stars and M Giant Article ASTROPHYSICS AND SPACE SCIENCE (1998)
Infrared spectra of carbon stars observed by the ISO SWS. I. Molecular absorption in N-type and SC-type stars Article ASTRONOMY AND ASTROPHYSICS (1998)
Molecules of Non-Photospheric Origin in Red Giants and Supergiants Revealed by the ISO SWS Tsuji, T., Ohnaka, K., Aoki, W., Yamamura, I. Article ASTROPHYSICS AND SPACE SCIENCE (1998)
Quantitative analysis of carbon isotopic ratios in carbon stars. II. The effect of model atmosphere on the iso-intensity method Ohnaka, K., Tsuji, T. Article ASTRONOMY AND ASTROPHYSICS (1998)
Dust formation in stellar photospheres: a case of very low mass stars and a possible resolution on the effective temperature scale of M dwarfs Tsuji, T., Ohnaka, K., Aoki, W. Article ASTRONOMY AND ASTROPHYSICS (1996)
Evolution of dusty photospheres through red to brown dwarfs: how dust forms in very low mass objects Tsuji, T., Ohnaka, K., Aoki, W., Nakajima, T. Article ASTRONOMY AND ASTROPHYSICS (1996)
Quantitative analysis of carbon isotopic ratios in carbon stars. I. 62 N-type and 15 SC-type carbon stars. Article ASTRONOMY AND ASTROPHYSICS (1996)
High resolution infrared spectra of silicon monoxide and silicon isotopic abundances in cool luminous stars Tsuji, T., Ohnaka, K., Hinkle, K. H., Ridgway, S. T. Article ASTRONOMY AND ASTROPHYSICS (1994)


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 Keiichi Onaka Proyecto (2018)
Resolving the mass loss from stars in late evolutionary stages by high spatial resolution observations Universidad Católica del Norte (10201329) Proyecto 2016-2017 Inv. Principal
Resolving the mass loss from stars in late evolutionary stages with the Very Large Telescope Interferometer ASTRONOMIA (31150002) Proyecto 2016-2018 Inv. Principal
Spatially resolving the inner wind region of stars in late evolutionary stages with VLT and VLTI Comité Mixto ESO - Gobierno de Chile (ORP38/16) Proyecto 2016-2018 Inv. Principal
Observational Study of the Outer Atmosphere and the Circumstellar Envelope of Cool Evolved Stars National Astronomical Observatory of Japan (NA) Proyecto 2013-2013 Inv. Principal
A joint effort to study the evolution of the close environment of the red-supergiant star Betelgeuse in the near IR European Interferometry Initiative (NA) Proyecto 2012-2012 Coinvestigador(a)

Alexandre Gallenne

Profesor

Instituto de alta investigación

Universidad de Tarapacá

Santiago, Chile

Keiichi Onaka

Associate Professor

UNIVERSIDAD CATOLICA DEL NORTE

Chile

Christian Adam

Post-doctoral researcher

Institute for Astronomy

Universidad de Antofagasta

Antofagasta, Chile

Keiichi Onaka

Líneas de Investigación

Educación

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

Experiencia Académica

Associate Professor Full Time

Experiencia Profesional

Postdoctoral fellow

Postdoctoral fellow

Postdoctoral fellow

Staff Astronomer

Article (86)

Proyecto (6)

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