Takashi Onaka

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  • Shigeyuki Sako, Takuya Yamashita, Hirokazu Kataza, Takashi Miyata, Yoshiko K Okamoto, Mitsuhiko Honda +6 others
  • 2005
The birth of very massive stars is not well understood, in contrast to the formation process of low-mass stars like our Sun. It is not even clear that massive stars can form as single entities; rather, they might form through the mergers of smaller ones born in tight groups. The recent claim of the discovery of a massive protostar in M17 (a nearby giant(More)
  • Yoshiko Kataza Okamoto, Hirokazu Kataza, Mitsuhiko Honda, Takuya Yamashita, Takashi Onaka, Jun-Ichi Watanabe +4 others
  • 2004
beta Pictoris (beta Pic) is a main-sequence star with an edge-on dust disk that might represent a state of the early Solar System. The dust does not seem to be a remnant from the original protoplanetary disk, but rather is thought to have been generated from large bodies like planetesimals and/or comets. The history and composition of the parent bodies can(More)
  • Takashi Onaka, Hideaki Fujiwara, Hirokazu Kataza, Woojung Kim, Toshinobu Takagi, Kazunori Uemizu +1 other
  • 2007
The Infrared Camera (IRC) is one of two focal-plane instruments on the AKARI 1 satellite. It is designed for wide-field deep imaging and low-resolution spectroscopy in the near-to mid-infrared (1.8–26.5 µm) in the pointed observation mode of AKARI. IRC is also operated in the survey mode to make an all-sky survey at 9 and 18 µm. It comprises three channels.(More)
  • Yoshiko K Okamoto, Hirokazu Kataza, Takuya Yamashita, Takashi Miyata, Shigeyuki Sako, Shin-Ya Takubo +2 others
  • 2002
COMICS is an observatory mid-infrared instrument for the 8.2 m Subaru Telescope. It is designed for imaging and spectroscopic observations in the N-(8-13 micron) and Q-bands (16-25 micron) atmospheric windows. The design and very preliminary performances at the first light observations in December 1999 were reported at the SPIE meeting in 2000. We describe(More)
which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. A 68-year-old female patient with IgG kappa-type multiple myeloma was treated with a bortezomib-based regimen. She had bilateral back pain 1 month after the chemotherapy. Because she had no skin lesions, we initially(More)
A mechanism for creating an enantioenrichment in the amino acids, the building blocks of the proteins, that involves global selection of one handedness by interactions between the amino acids and neutrinos from core-collapse supernovae is defined. The chiral selection involves the dependence of the interaction cross sections on the orientations of the spins(More)
  • Hideaki Fujiwara, Takuya Yamashita, Daisuke Ishihara, Takashi Onaka, Hirokazu Kataza, Takafumi Ootsubo +7 others
  • 2009
Photometry of the A0 V main-sequence star HD 106797 with AKARI and Gemini/T-ReCS is used to detect excess emission over the expected stellar photospheric emission between 10 and 20 µm, which is best attributed to hot circumstellar debris dust surrounding the star. The temperature of the debris dust is derived as T d ∼ 190 K by assuming that the excess(More)
  • Publ Astron, Soc, Japan, Yoshifusa Ita, Takashi Onaka, Daisuke Kato +13 others
  • 2008
We observed an area of 10 deg 2 of the Large Magellanic Cloud using the Infrared Camera on board AKARI. The observations were carried out using five imaging filters (3, 7, 11, 15, and 24 micron) and a dispersion prism (2 – 5 micron, λ/∆λ ∼ 20) equipped in the IRC. This paper describes the outline of our survey project and presents some initial results using(More)