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39 papers
Novel application to estimate the mass-loss and the dust-formation rates in O-type gamma-ray binaries using near-infrared photometry
Yuki Moritani, Akiko Kawachi, Atsuo T. Okazaki +2
We have performed the near-infrared photometric monitoring observations of two TeV gamma-ray binaries with O-stars (LS 5039 and 1FGL J1018.6-5856), using IRSF/SIRIUS at SAAO, in or…
Optical and Near-Infrared Monitoring of Gamma-ray Binaries Hosting Be Stars
Yuki Moritani, Akiko Kawachi
Optical and near-infrared observations are compiled for the three gamma-ray binaries hosting Be stars: PSR B1259-63, LSI+61 303, and HESS J0632+057. The emissions from the Be disk…
First Star Survivors as Metal-Rich Halo Stars that Experienced Supernova Explosions in Binary Systems
Takuma Suda, Takayuki R. Saitoh, Yuki Moritani +2
The search for the first stars formed from metal-free gas in the universe is one of the key issues in astronomy because it relates to many fields, such as the formation of stars an…
Near-infrared Brightening around the Periastron Passages of the Gamma-ray Binary PSR B125963 /LS 2883
A. Kawachi, Y. Moritani, A. T. Okazaki +2
The binary of the pulsar PSRB125963 and the Be star LS 2883 has been observed at the 2010 and 2014 periastron passages in the near-infrared (NIR) bands using the IRSF/SIRIUS and…
X-ray and Optical Observations of the Black Hole Candidate MAXI J1828-249
Sonoe Oda, Megumi Shidatsu, Satoshi Nakahira +8
We report results from X-ray and optical observations of the Galactic black hole candidate MAXI J1828-249, performed with Suzaku and the Kanata telescope around the X-ray flux peak…
Radial Velocity Survey of Nearby OB Stars
Yuki Moritani, Takuma Suda, Toshikazu Shigeyama +1
We report on the current status of the radial velocity monitoring of nearby OB stars to look for binaries with small mass ratios. The combined data of radial velocities using the d…