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On the basis of the near infrared observations of bulge red clump stars near the Galactic center, we have determined the galactocentric distance to be R 0 = 7.52 ± 0.10 (stat) ±0.35 (sys) kpc. We observed the red clump stars at | l | 1. • 0 and 0. • 7 | b | 1. • 0 with the IRSF 1.4 m telescope and the SIRIUS camera in the H and K S bands. After extinction(More)
We present a wide-field (approximately 6' x 6') and deep near-infrared (K(s) band: 2.14 mum) circular polarization image in the Orion nebula, where massive stars and many low-mass stars are forming. Our results reveal that a high circular polarization region is spatially extended (approximately 0.4 pc) around the massive star-forming region, the BN/KL(More)
The search for habitable exoplanets in the Universe is actively ongoing in the field of astronomy. The biggest future milestone is to determine whether life exists on such habitable exoplanets. In that context, oxygen in the atmosphere has been considered strong evidence for the presence of photosynthetic organisms. In this paper, we show that a previously(More)
We have conducted a systematic near-infrared circular polarization (CP) survey in star-forming regions, covering high-mass, intermediate-mass, and low-mass young stellar objects. All the observations were made using the SIRPOL imaging polarimeter on the Infrared Survey Facility 1.4 m telescope at the South African Astronomical Observatory. We present the(More)
HiCIAO is a high contrast instrument which works with a 188 element adaptive optics system (AO188) for the Subaru Telescope. The instrument is specifically designed for extrasolar planet search and studies of proto-planetary or debris disks. A coronagraph technique and some differential observing modes implemented in HiCIAO extract faint objects from the(More)
We have determined the ratios of total to selective extinction in the near-infrared bands (J, H, K S) toward the Galactic center from the observations of the region | l | 2. • 0 and 0. • 5 | b | 1. • 0 with the IRSF telescope and the SIRIUS camera. Using the positions of red clump stars in color-magnitude diagrams as a tracer of the extinction and(More)
Stars may not accumulate their mass steadily, as was previously thought, but in a series of violent events manifesting themselves as sharp stellar brightening. These events can be caused by fragmentation due to gravitational instabilities in massive gaseous disks surrounding young stars, followed by migration of dense gaseous clumps onto the star. Our(More)
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