KO
Keiichi Ohnaka
astro-ph.SRastro-phastro-ph.GAastro-ph.IMastro-ph.EP
On Valency
published · living versionsW_qgaum4vz·v1 · currentpublished
Infrared interferometric three-dimensional diagnosis of the atmospheric dynamics of the AGB star R Dor with VLTI/AMBER
with Gerd Weigelt, Karl-Heinz Hofmann
1 version
Preprints & journals
65 papers in the corpus · 2002–2026The variable mass-loss in low-mass red giant stars: Chromospheric motion across stellar evolution in 47 Tuc2610.06957v1 · Ian Baeza, L. Monaco, H. Frelijj et al.2026 · 0 citationsarXiv
A phoenix rises from the ashes: WOH G64 is still a red supergiant, for now2601.02057v1 · Jacco Th. van Loon, Keiichi Ohnaka2026 · 3 citationsarXiv
X TrA through the eyes of MATISSE: More evidence of clumpy molecular layers around C-type asymptotic giant branch stars2512.03910v1 · V. Rastau, C. Paladini, J. Drevon et al.2025 · 1 citationA&A 705, A127 (2026)
High-angular-resolution ALMA imaging of the inhomogeneous dynamical atmosphere of the asymptotic giant branch star W Hya2512.03156v1 · K. Ohnaka, K. T. Wong, G. Weigelt et al.2025 · 3 citationsAstronomy and Astrophysics, 2025, 704, A18
Low- and high-velocity `water fountains': different evolutionary stages2510.01856v2 · Rold'an A. Cala, Luis F. Miranda, Jos'e F. G'omez et al.2025 · 0 citationsarXiv
Identification and characterization of nascent planetary nebulae with OH and HO masers2509.15727v2 · Rold'an A. Cala, Jos'e F. G'omez, Luis F. Miranda et al.2025 · 4 citationsarXiv
Red Giant Winds Driven by Alfvén Waves with Magnetic Diffusion2501.00294v2 · Takeru K. Suzuki, Keiichi Ohnaka (U. Andr'es Bello), Yuki Yasuda (Hokkaido U.)2024 · 2 citationsarXiv
Imaging the innermost circumstellar environment of the red supergiant WOH G64 in the Large Magellanic Cloud2412.01921v1 · K. Ohnaka, K.-H. Hofmann, G. Weigelt et al.2024 · 10 citationsAstronomy and Astrophysics, 2024, 691, L15
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-ZIMPOL2411.09759v1 · K. Ohnaka, K. T. Wong, G. Weigelt et al.2024 · 6 citationsAstronomy and Astrophysics, 2024, 691, L14
An impressionist view of V Hydrae. When MATISSE paints Asymmetric Giant Blobs2405.07821v1 · L. Planquart, C. Paladini, A. Jorissen et al.2024 · 6 citationsA&A 687, A306 (2024)
Spatially resolving the AGB star V3 in the metal-poor globular cluster 47 Tuc with VLTI/GRAVITY2403.03287v2 · Keiichi Ohnaka, Gerd Weigelt, Karl-Heinz Hofmann et al.2024 · 0 citationsarXiv
Spatially resolved mid-infrared observations of the circumstellar environment of the born-again object FG Sge2212.07448v1 · K. Ohnaka, B. A. Jara Bravo2022 · 3 citationsarXiv
VLTI-MATISSE L- and N-band aperture-synthesis imaging of the unclassified B[e] star FS Canis Majoris2111.12458v1 · K.-H. Hofmann, A. Bensberg, D. Schertl et al.2021 · 14 citationsarXiv
Infrared interferometric imaging of the compact dust disk around the AGB star HR3126 with the bipolar Toby Jug Nebula2012.00768v1 · Keiichi Ohnaka, Dieter Schertl, Karl-Heinz Hofmann et al.2020 · 2 citationsA&A, 643, A175 (2020)
ALMA and VLA reveal the lukewarm chromospheres of the nearby red supergiants Antares and Betelgeuse2006.08023v1 · E. O'Gorman, G. M. Harper, K. Ohnaka et al.2020 · 22 citationsarXiv
Constraining stellar parameters and atmospheric dynamics of the carbon AGB star V Oph1907.08693v1 · Gioia Rau, Keiichi Ohnaka, Markus Wittkowski et al.2019 · 9 citationsarXiv
Cool, evolved stars: results, challenges, and promises for the next decade1903.04585v1 · Gioia Rau, Rodolfo Montez Jr., Kenneth G. Carpenter et al.2019 · 1 citationarXiv
Spatially resolving the atmosphere of the non-Mira-type AGB star SW Vir in near-infrared molecular and atomic lines with VLTI/AMBER1811.05989v1 · K. Ohnaka, M. Hadjara, M. Y. L. Maluenda Berna2018 · 6 citationsA&A 621, A6 (2019)
ALMA observations of the nearby AGB star L Puppis. II. Gas disk properties derived from CO and CO $J=-$2 emission1803.05222v1 · Ward Homan, Anita Richards, Leen Decin et al.2018 · 37 citationsAstronomy & Astrophysics, 05/2017, Volume 601, id.A5, 19 pp
The close circumstellar environment of Betelgeuse - V. Rotation velocity and molecular envelope properties from ALMA1711.07983v2 · Pierre Kervella, Leen Decin, Anita M. S. Richards et al.2017 · 82 citationsA&A 609, A67 (2018)
Vigorous atmospheric motion in the red supergiant star Antares.28816248 · Ohnaka, K, Weigelt, G, Hofmann, K-H2018 · 53 citationsNature. 2017;548(7667):310-312
Science cases for a visible interferometer1703.02395v3 · Philippe Stee, France Allard, Myriam Benisty et al.2017 · 5 citationsarXiv
ALMA observations of the nearby AGB star L2 Puppis - I. Mass of the central star and detection of a candidate planet1611.06231v1 · P. Kervella, W. Homan, A. M. S. Richards et al.2016 · 87 citationsarXiv
Clumpy dust clouds and extended atmosphere of the AGB star W Hya revealed with VLT/SPHERE-ZIMPOL and VLTI/AMBER II. Time variations between pre-maximum and minimum light1611.04622v1 · Keiichi Ohnaka, Gerd Weigelt, Karl-Heinz Hofmann2016 · 58 citationsA&A 597, A20 (2017)
VLTI-AMBER velocity-resolved aperture-synthesis imaging of Eta Carinae with a spectral resolution of 12000. Studies of the primary star wind and innermost wind-wind collision1610.05438v1 · G. Weigelt, K.-H. Hofmann, D. Schertl et al.2016 · 33 citationsarXiv
Clumpy dust clouds and extended atmosphere of the AGB star W Hya revealed with VLT/SPHERE-ZIMPOL and VLTI/AMBER1603.01197v2 · Keiichi Ohnaka, Gerd Weigelt, Karl-Heinz Hofmann2016 · 76 citationsA&A 589, A91 (2016)
The dust disk and companion of the nearby AGB star L2 Puppis - SPHERE/ZIMPOL polarimetric imaging at visible wavelengths1511.04448v1 · P. Kervella, M. Montarges, E. Lagadec et al.2015 · 68 citationsAstronomy & Astrophysics, vol. 578, A77 (2015)
Properties of the CO and HO MOLsphere of the red supergiant Betelgeuse from VLTI/AMBER observations1408.2994v2 · Miguel Montarges, Pierre Kervella, Guy Perrin et al.2014 · 52 citationsA&A 572, A17 (2014)
Imaging the outward motions of clumpy dust clouds around the red supergiant Antares with VLT/VISIR1407.0715v1 · Keiichi Ohnaka2014 · 16 citationsarXiv
VLA survey of the 22 GHz H2O masers toward 10 silicate carbon stars1310.4516v1 · K. Ohnaka, D. A. Boboltz, G. Mulitz-Schimel et al.2013 · 0 citationsarXiv
New insights into the dust formation of oxygen-rich AGB stars1310.1924v1 · I. Karovicova, M. Wittkowski, K. Ohnaka et al.2013 · 78 citationsarXiv
High spectral resolution imaging of the dynamical atmosphere of the red supergiant Antares in the CO first overtone lines with VLTI/AMBER1304.4800v2 · Keiichi Ohnaka, Karl-Heinz Hofmann, Dieter Schertl et al.2013 · 76 citationsarXiv
Spatially resolved, high-spectral resolution observation of the K giant Aldebaran in the CO first overtone lines with VLTI/AMBER1303.4763v1 · Keiichi Ohnaka2013 · 19 citationsarXiv
Detection of an asymmetry in the envelope of the carbon Mira R Fornacis using VLTI/MIDI1207.3910v2 · C. Paladini, S. Sacuto, D. Klotz et al.2012 · 16 citationsarXiv
First Keck Nulling Observations of a Young Stellar Object: Probing the Circumstellar Environment of the Herbig Ae star MWC 3251111.1813v2 · S. Ragland, K. Ohnaka, L. Hillenbrand et al.2011 · 16 citationsarXiv
Inhomogeneities in molecular layers of Mira atmospheres1107.0842v1 · M. Wittkowski, D. A. Boboltz, M. Ireland et al.2011 · 48 citationsA&A, 532, L7 (2011)
Mid-infrared interferometric monitoring of evolved stars - The dust shell around the Mira variable RR Aql at 13 epochs1107.0909v1 · I. Karovicova, M. Wittkowski, D. A. Boboltz et al.2011 · 24 citationsarXiv
The extended atmospheres of Mira variables probed by VLTI, VLBA, and APEX1105.3386v1 · M. Wittkowski, D. A. Boboltz, C. de Breuck et al.2011 · 1 citationarXiv
Structure and shaping processes within the extended atmospheres of AGB stars1105.3392v1 · M. Wittkowski, D. A. Boboltz, I. Karovicova et al.2011 · 0 citations2011apn5.confE..66W
Imaging the dynamical atmosphere of the red supergiant Betelgeuse in the CO first overtone lines with VLTI/AMBER1104.0958v1 · K. Ohnaka, G. Weigelt, F. Millour et al.2011 · 122 citationsarXiv
VLTI/AMBER unveils a possible dusty pinwheel nebula in WR1180909.4207v1 · Florentin Millour, Thomas Driebe, Olivier Chesneau (FIZEAU) et al.2009 · 18 citationsAstronomy and Astrophysics (2009)
Spatially resolving the inhomogeneous structure of the dynamical atmosphere of Betelgeuse with VLTI/AMBER0906.4792v1 · K. Ohnaka, K.-H. Hofmann, M. Benisty et al.2009 · 84 citationsarXiv
Tracing the young massive high-eccentricity binary system Theta 1 Orionis C through periastron passage0902.0365v3 · S. Kraus, G. Weigelt, Y.Y. Balega et al.2009 · 117 citationsarXiv
An Improved Model of SiO Maser Emission in Miras0811.2770v1 · M.D. Gray, M. Wittkowski, M. Scholz et al.2008 · 107 citations2009MNRAS.394...51G
Asymmetric silicate dust distribution toward the silicate carbon star BM Gem0807.3342v1 · Keiichi Ohnaka, Hideyuki Izumiura, Christoph Leinert et al.2008 · 28 citationsarXiv
Spatially resolved dusty torus toward the red supergiant WOH G64 in the Large Magellanic Cloud0803.3823v1 · Keiichi Ohnaka, Thomas Driebe, Karl-Heinz Hofmann et al.2008 · 61 citationsarXiv
The close circumstellar environment of the semi-regular S-type star Pi^1 Gruis0803.3077v1 · St'ephane Sacuto (LG), Alain Jorissen, Pierre Cruzalebes (LG) et al.2008 · 19 citationsarXiv
Resolving the inner active accretion disk around the Herbig Be star MWC 147 with VLTI/MIDI+AMBER spectro-interferometry0801.4377v1 · Stefan Kraus, Thomas Preibisch, Keiichi Ohnaka2008 · 0 citationsarXiv
J, H, K spectro-interferometry of the Mira variable S Orionis0801.0594v1 · M. Wittkowski, D. A. Boboltz, T. Driebe et al.2008 · 57 citationsarXiv
Imaging the oxygen-rich disk toward the silicate carbon star EU And0712.2395v1 · Keiichi Ohnaka, David A. Boboltz2007 · 10 citationsarXiv
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