Giants in the globular cluster omega Centauri: dust production, mass-loss and distance (2009)
Van Loon, Jacco Th, Boyer, Martha L, Dupree, Andrea K, Evans, Aneurin, ...
We present spectral energy distribution modelling of 6875 stars in omega Centauri, obtaining stellar luminosities and temperatures by fitting literature photometry to state-of-the-art MARCS stellar...
Training of Instrumentalists and Development of New Technologies on SOFIA (2009)
Erickson, Edwin F., Allamandola, Louis J., Baluteau, Jean-Paul, Becklin, Eric E., Bjoraker, Gordon, Burton, Michael, ...
This white paper is submitted to the Astronomy and Astrophysics 2010 Decadal Survey (Astro2010)1 Committee on the State of the Profession to emphasize the potential of the Stratospheric Observatory...
Boyer, Martha L., Skillman, Evan D., Van Loon, Jacco Th., Gehrz, Robert D., Woodward, Charles E.
We present the third and final part of a census of Asymptotic Giant Branch (AGB) stars in Local Group dwarf irregular galaxies. Papers I and II presented the results for WLM and IC 1613. Included...
Giants in the globular cluster omega Centauri: dust production, mass loss and distance (2008)
McDonald, Iain, Van Loon, Jacco Th., Decin, Leen, Boyer, Martha L., Dupree, Andrea K., Evans, Aneurin, ...
We present spectral energy distribution modelling of 6875 stars in omega Centauri, obtaining stellar luminosities and temperatures by fitting literature photometry to state-of-the-art MARCS stellar...
Boyer, Martha L., McDonald, Iain, Van Loon, Jacco Th., Woodward, Charles E., Gehrz, Robert D., Evans, A., ...
We present a Spitzer Space Telescope imaging survey of the most massive Galactic globular cluster, omega Centauri, and investigate stellar mass loss at low metallicity and the intracluster medium...
The Neon Abundance in the Ejecta of QU Vul From Late-Epoch IR Spectra (2007)
Gehrz, Robert D., Woodward, Charles E., Helton, L. Andrew, Polomski, Elisha F., Hayward, Thomas L., Houck, James R., ...
We present ground-based SpectroCam-10 mid-infrared, MMT optical, and Spitzer Space Telescope IRS mid-infrared spectra taken 7.62, 18.75, and 19.38 years respectively after the outburst of the old...
Jackson, Dale C., Skillman, Evan D., Gehrz, Robert D., Polomski, Elisha, Woodward, Charles E.
We present Spitzer Space Telescope IRAC photometry of the Local Group dwarf irregular galaxy IC 1613. We compare our 3.6, 4.5, 5.8, and 8.0 micron photometry with broadband optical photometry and...
Block, David L., Combes, Francoise, Puerari, Ivanio, Freeman, Kenneth C., Stockton, Alan, Canalizo, Gabriela, ...
In an earlier study of the spiral galaxy M33, we photometrically identified arcs or outer spiral arms of intermediate age (0.6 Gyr - 2 Gyr) carbon stars precisely at the commencement of the HI-warp....
Jackson, Dale C., Skillman, Evan D., Gehrz, Robert D., Polomski, Elisha, Woodward, Charles E.
We present Spitzer/IRAC observations at 3.6 and 4.5 microns along with optical data from the Local Group Galaxies Survey to investigate the evolved stellar population of the Local Group dwarf...
A Spitzer Study of Comets 2P/Encke, 67P/Churyumov-Gerasimenko, and C/2001 HT50 (LINEAR-NEAT) (2006)
Kelley, Michael S., Woodward, Charles E., Harker, David E., Wooden, Diane H., Gehrz, Robert D., Campins, Humberto, ...
We present infrared images and spectra of comets 2P/Encke, 67P/Churyumov-Gerasimenko, and C/2001 HT50 (LINEAR-NEAT) as part of a larger program to observe comets inside of 5 AU from the sun with the...
Spitzer Space Telescope Infrared Imaging and Spectroscopy of the Crab Nebula (2006)
Temim, Tea, Gehrz, Robert D., Woodward, Charles E., Roellig, Thomas L., Smith, Nathan, Rudnick, Lawrence R., ...
We present 3.6, 4.5, 5.8, 8.0, 24, and 70 micron images of the Crab Nebula obtained with the Spitzer Space Telescope IRAC and MIPS cameras, Low- and High-resolution Spitzer IRS spectra of selected...
Boyer, Martha L., Woodward, Charles E., Van Loon, Jacco Th., Gordon, Karl D., Evans, A., Gehrz, Robert D., ...
We present Spitzer Space Telescope IRAC and MIPS observations of the galactic globular cluster M15 (NGC 7078), one of the most metal-poor clusters with a [Fe/H] = -2.4. Our Spitzer images reveal a...
Spitzer Far-Infrared Detections of Cold Circumstellar Disks (2006)
Smith, Paul S., Hines, Dean C., Low, Frank J., Gehrz, Robert D., Polomski, Elisha F., Woodward, Charles E.
Observations at 70 microns with the Spitzer Space Telescope have detected several stellar systems within 65 pc of the Sun. Of 18 presumably young systems detected in this study, as many as 15 have...
On Extending the Mass-Metallicity Relation of Galaxies by 2.5 Decades in Stellar Mass (2006)
Lee, Henry, Skillman, Evan D., Cannon, John M., Jackson, Dale C., Gehrz, Robert D., Polomski, Elisha F., ...
We report 4.5 micron luminosities for 27 nearby (D < 5 Mpc) dwarf irregular galaxies measured with the Spitzer Infrared Array Camera. We have constructed the 4.5 micron luminosity-metallicity (L-Z)...
Jackson, Dale C., Cannon, John M., Skillman, Evan D., Lee, Henry, Gehrz, Robert D., Woodward, Charles E., ...
We present Spitzer Space Telescope 4.5 and 8.0 micron imaging of 15 Local Group and nearby dwarf galaxies. Our sample spans a range of more than one dex in nebular metallicity and over three orders...
M33's Variable A -- A Hypergiant Star More Than 35 Years in Eruption (2006)
Humphreys, Roberta M., Jones, Terry J., Polomski, Elisha, Koppelman, Michael, Helton, Andrew, McQuinn, Kristen, ...
Variable A in M33 is a member of a rare class of highly luminous, evolved stars near the upper luminosity boundary that show sudden and dramatic shifts in apparent temperature due to the formation of...
Van Loon, Jacco Th., McDonald, Iain, Oliveira, Joana M., Evans, A., Boyer, Martha L., Gehrz, Robert D., ...
We present 8-13 micron spectra of eight red giants in the globular cluster 47 Tucanae (NGC 104), obtained at the European Southern Observatory 3.6m telescope. These are the first mid-infrared spectra...
On extending the mass-metallicity relation of galaxies by 2.5 decades in stellar mass (2006)
Lee, Henry, Skillman, Evan D., Cannon, John M., Jackson, Dale C., Gehrz, Robert D., Polomski, Elisha F., ...
We report 4.5 mum luminosities for 27 nearby (D
Jackson, Dale C., Cannon, John M., Skillman, Evan D., Lee, Henry, Gehrz, Robert D., Woodward, Charles E., ...
We present Spitzer 4.5 and 8.0 mum imaging of 15 Local Group and nearby dwarf galaxies. We find that the diffuse 8 mum emission is spatially correlated with regions of active star formation. Our...
Buckalew, Brent A., Kobulnicky, Henry A., Darnel, Jonathan M., Polomski, Elisha, Gehrz, Robert D., Humphreys, Roberta M., ...
We present ultraviolet, optical, near-infrared, Spitzer mid-infrared, and radio images of 14 radio-selected objects in M 33. These objects are thought to represent the youngest phase of star cluster...
Kinematic Structure of H2 and [Fe II] in the Bipolar Planetary Nebula M 2-9 (2005)
Smith, Nathan, Balick, Bruce, Gehrz, Robert D.
We present high-dispersion long-slit IR spectra of the double-shell bipolar planetary nebula M 2-9 in the emission lines [Fe II] 16435 and H2 v=1--0 S(1) 21218. H2 spectra reveal for the first time...
Spitzer IRAC Observations of Star Formation in N159 in the LMC (2004)
Jones, Terry J., Woodward, Charles E., Boyer, Martha L., Gehrz, Robert D., Polomski, Elisha
We present observations of the giant HII region complex N159 in the LMC using IRAC on the {\it Spitzer Space Telescope}. One of the two objects previously identified as protostars in N159 has an SED...
Bipolar Symbiotic Planetary Nebulae in the Thermal-IR: M2-9, Mz3, and He2-104 (2004)
Smith, Nathan, Gehrz, Robert D.
We present thermal-IR images of three extreme bipolar objects, M2-9, Mz3, and He2-104. They are bipolar planetary nebulae with bright central stars and are thought to be powered by symbiotic binary...
Kinematics and Ultraviolet to Infrared Morphology of the Inner Homunculus of η Carinae (2004)
Smith, Nathan, Morse, Jon A., Gull, Theodore R., Hillier, D. John, Gehrz, Robert D., Walborn, Nolan R., ...
We present the first ultraviolet and optical images of η Car and itscircumstellar Homunculus nebula, obtained with the Advanced Camera forSurveys/High Resolution Camera (ACS/HRC) on board the Hubble...
A disrupted circumstellar torus inside eta Carinae's Homunculus Nebula (2002)
Smith, Nathan, Gehrz, Robert D., Hinz, Phillip M., Hoffmann, William F., Mamajek, Eric E., Meyer, Michael R., ...
We present thermal infrared images of the bipolar nebula surrounding eta Carinae at six wavelengths from 4.8 to 24.5 microns. These were obtained with the MIRAC3 camera system at the Magellan...
Infrared Studies of AFGL Sources. (2002)
Gehrz,Robert D., Hackwell,John A., Grasdalen,Gary L.
The data acquired during the past three years from a promising base upon which to build a statistically complete analysis of the infrared objects populating our galaxy. Wyoming observations have also...