Search Publications
A Far-Ultraviolet Spectroscopic Survey of Luminous Cool Stars
Young, P. R.; Linsky, J. L.; Lobel, A. +3 more
The Far Ultraviolet Spectroscopic Explorer (FUSE) ultraviolet spectra of eight giant and supergiant stars reveal that high-temperature (3×105 K) atmospheres are common in luminous cool stars and extend across the color-magnitude diagram from α Car (F0 II) to the cool giant α Tau (K5 III). Emission present in these spectra includes chrom…
The Araucaria Project: The Effect of Blending on the Cepheid Distance to NGC 300 from Advanced Camera for Surveys Images
Bresolin, Fabio; Kudritzki, Rolf-Peter; Gieren, Wolfgang +1 more
We have used the Advanced Camera for Surveys aboard the Hubble Space Telescope (HST) to obtain F435W, F555W, and F814W single-epoch images of six fields in the spiral galaxy NGC 300. Taking advantage of the superb spatial resolution of these images, we have tested the effect that blending of the Cepheid variables studied from the ground with close…
Hubble Space Telescope NICMOS Imaging of W3 IRS 5: A Trapezium in the Making?
Megeath, S. T.; Wilson, T. L.; Corbin, M. R.
We present Hubble Space Telescope NICMOS imaging of W3 IRS 5, a binary high-mass protostar. In addition to the two protostars, NICMOS images taken in the F222M and F160W filters show three new 2.22 µm sources with very red colors; these sources fall within a region 5600 AU in diameter and are coincident with an ~100 Msolar, dense …
Ring Analysis of Solar Subsurface Flows and Their Relation to Surface Magnetic Activity
Howe, R.; Komm, R.; Hill, F. +3 more
We measure the horizontal flows in the outer 2% of the Sun by analyzing 14 consecutive Carrington rotations of Global Oscillation Network Group (GONG) Doppler images and two of Michelson Doppler Imager (MDI) Dynamics Program data with the ring-diagram technique. The zonal and meridional flows show no variation with activity at low to medium activi…
A High Angular Resolution Search for the Progenitor of the Type Ic Supernova 2004gt
Cenko, S. B.; Kulkarni, S. R.; Matthews, K. +6 more
We report the results of a high spatial resolution search for the progenitor of Type Ic supernova SN 2004gt, using the newly commissioned Keck laser guide star adaptive optics (LGSAO) system along with archival Hubble Space Telescope data. This is the deepest search yet performed for the progenitor of any Type Ib/c event in a wide wavelength range…
A Hubble Space Telescope Search for Substellar Companions in the Young Cluster IC 348
Luhman, K. L.; McLeod, K. K.; Goldenson, N.
We present the results of a search for substellar companions to members of the star-forming cluster IC 348. Using the Wide Field Planetary Camera 2 on board the Hubble Space Telescope, we have obtained deep, high-resolution images of the cluster through the F791W and F850LP filters. These data encompass 150 known members of IC 348, including 14 pr…
Distant Red Galaxies in the Hubble Ultra Deep Field
Toft, S.; van Dokkum, P.; Bouwens, R. J. +4 more
We take advantage of the Hubble Ultra Deep Field data to study the rest-frame optical and UV morphologies of the novel population of distant red galaxies (DRGs). Six galaxies with J-Ks>2.3 are found to Ks=21.5, five of which have photometric redshifts zphot>~2, corresponding to a surface density of 0.9 arcmin…
A New View of the Circumstellar Environment of SN 1987A
Crotts, Arlin P. S.; Lawrence, Stephen S.; Sugerman, Ben E. K. +2 more
We summarize the analysis of a uniform set of both previously known and newly discovered scattered-light echoes, detected within 30" of SN 1987A in 10 years of optical imaging, and with which we have constructed the most complete three-dimensional model of the progenitor's circumstellar environment. Surrounding the SN is a richly structured bipola…
Multiwavelength Observations of Radio Galaxy 3C 120 with XMM-Newton
Malkan, M. A.; Page, M. J.; Tornikoski, M. +5 more
We present XMM-Newton observations of the radio galaxy 3C 120. Contemporaneous radio, millimeter-wave, and optical data provide additional constraints on the spectral energy distribution and physical state of the active galactic nucleus. The hard X-ray spectrum contains a marginally resolved Fe I Kα emission line with FWHM=9000+/-3000 km s-1<…
Improved Laboratory Transition Probabilities for Pt I and Application to the Platinum Abundances of BD +17°3248 and the Sun
Sneden, C.; Beers, T. C.; Lawler, J. E. +3 more
Radiative lifetimes, accurate to +/-5%, have been measured for 58 odd-parity levels of Pt I using laser-induced fluorescence. The lifetimes were combined with branching fractions measured using grating and Fourier transform spectrometry to determine transition probabilities for 127 lines of Pt I. The new Pt lifetime measurements were found to be i…