A. Tokunaga

Publications429
h-index51
Citations9,185
Highly Influential Citations855
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Detection of absorption by H2 in molecular clouds: A direct measurement of the H2:CO ratio
Vibrational absorption by H2 and CO has been searched for toward infrared sources embedded in molecular clouds. H2 was detected toward NGC 2024 IRS 2 and possibly toward NGC 2264 (GL 989). CO was…
The Mauna Kea observatories near-infrared filter set. II. Specifications for a new JHKL ' M ' filter set for infrared astronomy
We present a description of a new 1-5 mm filter set similar to the long-used JHKLM filter set derived from that of Johnson. The new Mauna Kea Observatories Near-Infrared filter set is designed to…
The Mauna Kea Observatories Near-Infrared Filter Set. III. Isophotal Wavelengths and Absolute Calibration
ABSTRACT The isophotal wavelengths, flux densities, and AB magnitudes for Vega (α Lyr) are presented for the Mauna Kea Observatories near‐infrared filter set. We show that the near‐infrared absolute…
Absorption features in the 3 micron spectra of protostars
Low-resolution spectra have been obtained for a selection of infrared protostars and one object located behind the Taurus dark cloud. Most of the differences in the spectra can be attributed to…
High-resolution spectra of the 3.29 micron interstellar emission feature - A summary
High spectral resolution observations of the 3.29-micron interstellar emission feature show two types of profiles. Type 1 has a central wavelength of 3.289-micron and is observed in extended objects…
A Medium Resolution Near-Infrared Spectral Atlas of O and Early-B Stars
We present intermediate-resolution (R ~ 8000-12,000) high signal-to-noise (S/N) H- and K-band spectroscopy of a sample of 37 optically visible stars, ranging in spectral type from O3 to B3 and…
The nature of the nuclear sources in M82 and NGC 253
The Mauna Kea Observatories Near‐Infrared Filter Set. I. Defining Optimal 1–5 Micron Bandpasses
A new Mauna Kea Observatories near-infrared (MKO-NIR) filter set is described, including techniques and considerations given to designing a new set of bandpasses that are useful at both mid- and…
Radiometry of near-earth asteroids.
TLDR
Thermal models are used to derive radiometric albedos and diameters for 22 Aten, Apollo, and Amor asteroids, finding several of these asteroids appear to have surfaces of relatively high thermal inertia due to the exposure of bare rock or a coarse regolith.
CSHELL: a high spectral resolution 1-5-μm cryogenic echelle spectrograph for the IRTF
A 1 - 5.4 micrometers Cryogenic Echelle Spectrograph (CSHELL) for the NASA Infrared Telescope Facility is described. It achieves a resolving power of 5,000 to 40,000 using slits ranging from 4.0' to…
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