OHNAKA , K.

International audience

Aims: We present aperture-synthesis imaging of the red supergiant Antares (α Sco) in the CO first overtone lines. Our goal is to probe the structure and dynamics of the outer atmosphere. Methods: Antares was observed between 2.28 μm and 2.31 μm with VLTI/AMBER with spectral resolutions of up to 12 000 and angular resolutions as high as 7.2 mas...

International audience

International audience

ASP proceedings of the Workshop "Stars with the B[e] Phenomenon, eds. M. Kraus and A. S. Miroshnichenko, ASP Conf. Series n/a, (2006)

International audience

Astron. & Astrophys., 464, pp. 81-86 (2007)

Astron. & Astrophys., 464, pp. 81-86 (2006)

We present the first high spatial and spectral observations of the circumstellar envelope (CSE) of a B[e] supergiant (CPD$-57 2874$), performed with the Very Large Telescope Interferometer (VLTI). Spectra, visibilities, and closure phase, were obtained using the beam-combiner instruments AMBER (near-IR interferometry with three 8.3 m Unit...

Advances in Stellar Interferometry, eds. J. D. Monnier, M. Schoeller and W. C. Danchi, SPIE 6268, (2006)

The sharpest images on Paranal are produced by the beam-combining instruments of the Very Large Telescope Interferometer (VLTI). Currently, the VLTI is close to completing a transitional period, moving away from the first generation of instruments (AMBER, MIDI) and offering new instruments and subsystems to the community. In this article, we...

Context. The mass loss from massive stars is not understood well. η Carinae is a unique object for studying the massive stellar wind during the luminous blue variable phase. It is also an eccentric binary with a period of 5.54 yr. The nature of both stars is uncertain, although we know from X-ray studies that there is a wind-wind collision...