Search Publications
Identifying Contaminated K-Band Globular Cluster RR Lyrae Photometry
Gieren, W.; Turner, D.; Majaess, D.
Acquiring near-infrared K-band (2.2 µm) photometry for RR Lyrae variables in globular clusters and nearby galaxies is advantageous, since the resulting distances are less impacted by reddening and metallicity. However, K-band photometry for RR Lyrae variables in M5, Reticulum, M92, ω Cen, and M15 display clustercentric trends. The Hubble Spa…
Interstellar Gas in the Local Chimneys
Welsh, Barry Y.; Lallement, Rosine
We present ultraviolet absorption observations of four nearby (d < 250 pc) DA white dwarfs using spectral data (R ∼ 15 km s-1) obtained with the NASA HST Cosmic Origins Spectrograph (1150-1700 Å) and the Far Ultraviolet Spectroscopic Explorer (912-1170 Å). Two of these targets (WD2321 - 549 and WD2124 - 224) sample gas along the Sout…
Far-Ultraviolet Spectroscopy of Three Long-Period Novalike Variables
Sion, Edward M.; Godon, Patrick; Bisol, Alexandra C.
We have selected three novalike variables at the long-period extreme of novalike orbital periods: V363 Aur, RZ Gru, and AC Cnc, all with IUE archival far-ultraviolet spectra. All are UX UMa-type novalike variables and all have Porb > 7 hr. V363 Aur is a bona fide SW Sex star, and AC Cnc is a probable one, while RZ Gru has not proven …
TYC 8380-1953-1: Discovery of an RS CVn Binary Through the XMM-Newton Slew Survey
Stelzer, B.; López-Santiago, J.; Saxton, R.
In this article we report the discovery of the chromospherically active (RS CVn type) binary TYC 8380-1953-1 through the XMM-Newton slew survey and present results of our optical and X-ray follow-up. With a flux limit of 6 × 10-13 ergs cm-2 s-1 in the soft band (0.2-2 keV), the XMM-Newton slew has a similar sensiti…
The [Fe/H] Dependence on the Ca ii- MV Relationship
Pancino, E.; Wallerstein, George; Gomez, T. A.
We have examined the Wilson-Bappu effect, a relationship between the absolute magnitude of the star, MV, and the logarithm of the Ca ii emission width, W0, over the largest MV range to date, +13 to -5, covering M-dwarfs to type Ia supergiants. We used an extensive literature, the latest Hipparcos reduction, data fr…
Using the XMM-Newton Optical Monitor to Study Cluster Galaxy Evolution
Kuntz, K. D.; Hammer, Derek; Miller, Neal A. +2 more
We explore the application of XMM-Newton Optical Monitor (XMM-OM) ultraviolet (UV) data to study galaxy evolution. Our sample is constructed as the intersection of all Abell clusters with z < 0.05 and having archival XMM-OM data in either the UVM2 or UVW1 filters, plus optical and UV photometry from the Sloan Digital Sky Survey and GALEX, respe…
Intermediate Velocity Gas Detected Towards the NGC 6752 Globular Cluster
Welsh, Barry Y.; Lallement, Rosine
We present medium resolution ultraviolet absorption measurements recorded with the HST-COS and FUSE spectrographs towards two post-AGB stars (UIT-1 and B1754) associated with the NGC 6752 globular cluster. We have detected intermediate velocity (IV) gas with Vlsr ∼ +38 km s-1 along the 3.9 kpc sight-line to the cluster in the…
KINGFISH—Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel: Survey Description and Image Atlas
Helou, G.; Roussel, H.; Murphy, E. J. +40 more
The KINGFISH project (Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel) is an imaging and spectroscopic survey of 61 nearby (d < 30 Mpc) galaxies, chosen to cover a wide range of galaxy properties and local interstellar medium (ISM) environments found in the nearby universe. Its broad goals are to characterize the ISM of pre…
IMACS: The Inamori-Magellan Areal Camera and Spectrograph on Magellan-Baade
Dressler, Alan; Kelson, Daniel; Shectman, Stephen +12 more
The Inamori-Magellan Areal Camera and Spectrograph (IMACS) is a wide-field, multipurpose imaging spectrograph on the Magellan-Baade telescope at Las Campanas Observatory. IMACS has two channels—f/2 and f/4, each with an 8K × 8K pixel mosaic of CCD detectors, that service the widest range of capabilities of any major spectrograph. These include wid…
Water in Star-forming Regions with the Herschel Space Observatory (WISH). I. Overview of Key Program and First Results
de Graauw, Th.; Liseau, R.; Braine, J. +69 more
Water In Star-forming regions with Herschel (WISH) is a key program on the Herschel Space Observatory designed to probe the physical and chemical structures of young stellar objects using water and related molecules and to follow the water abundance from collapsing clouds to planet-forming disks. About 80 sources are targeted, covering a wide rang…