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The Unusual Object IC 2144/MWC 778
G. H. Herbig, William D. Vacca
IC 2144 is a small reflection nebula located in the zone of avoidance near the Galactic anticenter. It has been investigated here largely on the basis of Keck/HIRES optical spectro…
Young star clusters in interacting galaxies - NGC 1487 and NGC 4038/4039
Sabine Mengel, Matthew D. Lehnert, Niranjan A. Thatte +3
We estimate the dynamical masses of several young (~10 Myr) massive star clusters in two interacting galaxies, NGC 4038/4039 ("The Antennae") and NGC 1487, under the assumption of…
Imaging of the Stellar Population of IC10 with Laser Guide Star Adaptive Optics and the Hubble Space Telescope
William D. Vacca, Christopher D. Sheehy, James R. Graham
We present adaptive optics (AO) images of the central starburst region of the dwarf irregular galaxy IC10. The Keck 2 telescope laser guide star was used to achieve near diffractio…
Oph 1622-2405: Not a Planetary-Mass Binary
K. L. Luhman, K. N. Allers, D. T. Jaffe +4
We present an analysis of the mass and age of the young low-mass binary Oph 1622-2405. Using resolved optical spectroscopy of the binary, we measure spectral types of M7.25+/-0.25…
A census of the Wolf-Rayet content in Westerlund 1 from near-infrared imaging and spectroscopy
Paul A. Crowther, L. J. Hadfield, J. S. Clark +2
New NTT/SOFI imaging and spectroscopy of the Wolf-Rayet population in Westerlund 1 are presented. Narrow-band near-IR imaging together with follow up spectroscopy reveals four new…
Ultracompact Blue Dwarf Galaxies: Hubble Space Telescope Imaging and Stellar Population Analysis
Michael R. Corbin, William D. Vacca, Roberto Cid Fernandes +3
We present deep Hubble Space Telescope Advanced Camera for Surveys / High Resolution Channel U, narrow-V, and I images of nine "ultracompact" blue dwarf galaxies (UCBDs) selected f…
Low Carbon Abundance in Type Ia Supernovae
G. H. Marion, P. Hoeflich, J. C. Wheeler +3
We investigate the quantity and composition of unburned material in the outer layers of three normal Type Ia supernovae (SNe Ia): 2000dn, 2002cr and 20 04bw. Pristine matter from a…
The Schizophrenic Spectrum of LSR 1610-0040: a Peculiar M Dwarf/Subdwarf
Michael C. Cushing, William D. Vacca
We present a moderate resolution (R=2000), 0.8-4.1 micron spectrum of LSR 1610-0040, a high proper motion star classified as an early-type L subdwarf by Lepine and collaborators ba…
Hubble Space Telescope Imaging of the Ultracompact Blue Dwarf Galaxy HS 0822+3542: An Assembling Galaxy in a Local Void?
Michael R. Corbin, William D. Vacca, John E. Hibbard +2
We present deep U, narrow-V, and I-band images of the ultracompact blue dwarf galaxy HS 0822+3542, obtained with the Advanced Camera for Surveys / High Resolution Channel of the Hu…
FORS spectroscopy of galaxies in the Hubble Deep Field South
Dimitra Rigopoulou, William D. Vacca, Stefano Berta +2
We present low resolution multi-object spectroscopy of an I-band magnitude limited (I_{AB} ~ 23--23.5) sample of galaxies located in an area centered on the Hubble Deep Field-South…
An Infrared Spectroscopic Sequence of M, L and T Dwarfs
Michael C. Cushing, John T. Rayner, William D. Vacca
We present a 0.6-4.1 micron spectroscopic sequence of M, L, and T dwarfs. The spectra have R~2000 from 0.9 to 2.4 microns and R=2500-200 from 2.9 to 4.1 microns. These new data nea…
STIS ultraviolet/optical spectroscopy of `warm' ultraluminous infrared galaxies
D. Farrah, J. A. Surace, S. Veilleux +2
(Abridged) We present high spatial resolution ultraviolet and optical spectroscopy, obtained using the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, of…
Mass Segregation and the Initial Mass Function of Super Star Cluster M82-F
Nate McCrady, James R. Graham, William D. Vacca
We investigate the Initial Mass Function and mass segregation in super star cluster M82-F with high resolution Keck/NIRSPEC echelle spectroscopy. Cross-correlation with template su…
Near-Infrared Spectroscopy of McNeil's Nebula Object
W. D. Vacca, M. C. Cushing, T. Simon
We present 0.8-5.2 micron spectroscopy of the compact source at the base of a variable nebula (McNeil's Nebula Object) in the Lynds 1630 dark cloud that went into outburst in late…
The Host Galaxy of GRB 031203: Implications of its low metallicity, low redshift, and starburst nature
Jason X. Prochaska, Joshua S. Bloom, Hsiao-Wen Chen +6
We present Keck/NIRSPEC near-IR images and Magellan/IMACS optical spectroscopy of the host galaxy of GRB 031203. The host is an actively star-forming galaxy at z=0.1055 +/- 0.0001.…
Non-Linearity Corrections and Statistical Uncertainties Associated with Near-Infrared Arrays
W. D. Vacca, M. C. Cushing, J. T. Rayner
We derive general equations for non-linearity corrections and statistical uncertainty (variance) estimates for data acquired with near-infrared detectors employing correlated doubl…
Near Infrared Spectra of Type Ia Supernovae
G. H. Marion, P. Höflich, W. D. Vacca +1
We report near infrared (NIR) spectroscopic observations of twelve ``Branch-normal'' Type Ia supernovae (SNe Ia) which cover the wavelength region from 0.8-2.5 microns. Our sample…
Galaxies in Southern Bright Star Fields I. Near-infrared imaging
Andrew J. Baker, Richard I. Davies, Matthew D. Lehnert +6
As a prerequisite for cosmological studies using adaptive optics techniques, we have begun to identify and characterize faint sources in the vicinity of bright stars at high Galact…
A mid-infrared spectroscopic survey of starburst galaxies: excitation and abundances
Aprajita Verma, Dieter Lutz, Eckhard Sturm +3
We present spectroscopy of MIR emission lines in twelve starburst regions, located in eleven starburst galaxies, for which a significant number of lines between 2.38 and 45micron w…
A Method of Correcting Near-Infrared Spectra for Telluric Absorption
William D. Vacca, Michael C. Cushing, John T. Rayner
We present a method for correcting near-infrared medium-resolution spectra for telluric absorption. The method makes use of a spectrum of an A0V star, observed near in time and clo…
FeH Absorption in the Near-Infrared Spectra of Late M and L Dwarfs
M. C. Cushing, J. T. Rayner, S. P. Davis +1
We present medium-resolution z-, J-, and H-band spectra of four late-type dwarfs with spectral types ranging from M8 to L7.5. In an attempt to determine the origin of numerous weak…
POX 186: A Dwarf Galaxy in the Process of Formation?
Michael R. Corbin, William D. Vacca
We present deep U, V and I band images of the "ultracompact" blue dwarf galaxy POX 186 obtained with the Planetary Camera 2 of the Hubble Space Telescope. We have also obtained a n…
N-band Observations of He 2-10: Unveiling the Dusty Engine of a Starburst Galaxy
William D. Vacca, Kelsey E. Johnson, Peter S. Conti
To better understand the early stages of massive star cluster evolution we have obtained J,H,K', and N (10.8 micron) images of the nuclear region of the starburst galaxy He 2-10. T…
The Mauna Kea Observatories Near-Infrared Filter Set. II. Specifications for a New JHKL'M' Filter Set for Infrared Astronomy
A. T. Tokunaga, D. A. Simons, W. D. Vacca
We present a description of a new 1--5 m filter set similar to the long-used JHKLM filter set derived from that of Johnson. The new Mauna Kea Observatories Near-Infrared (MKO-NI…