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9 papers · 1 filter
The Cepheid Period-Luminosity Relation at Mid-Infrared Wavelengths: I. First-Epoch LMC Data
Wendy L. Freedman, Barry F. Madore, Jane Rigby +2
We present the first mid-infrared Period-Luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids. Single-epoch observations of 70 Cepheids were extracted from Spitzer I…
Cool Companions to White Dwarf Stars from the Two Micron All Sky Survey All Sky Data Release
D. W. Hoard, S. Wachter, Laura K. Sturch +5
We present the culmination of our near-infrared survey of the optically spectroscopically identified white dwarf stars from the McCook & Sion catalog, conducted using photometric d…
Spitzer Space Telescope observations of magnetic cataclysmic variables: possibilities for the presence of dust in polars
C. S. Brinkworth, D. W. Hoard, S. Wachter +6
We present Spitzer Space Telescope photometry of six short-period polars, EF Eri, V347 Pav, VV Pup, V834 Cen, GG Leo, and MR Ser. We have combined the Spitzer Infrared Array Camera…
The powerful outburst in Hercules A
P. E. J. Nulsen, D. C. Hambrick, B. R. McNamara +4
The radio source Hercules A resides at the center of a cooling flow cluster of galaxies at redshift z = 0.154. A Chandra X-ray image reveals a shock front in the intracluster mediu…
Chandra HRC Localization of the Low Mass X-ray Binaries X1624-490 and X1702-429: The Infrared Counterparts
S. Wachter, J. W. Wellhouse, S. K. Patel +3
We report on the precise localization of the low mass X-ray binaries X1624-490 and X1702-429 with the Chandra HRC-I. We determine the best positions to be 16:28:02.825 -49:11:54.61…
Simultaneous optical and X-ray high speed photometry of Cyg X-2
G. Dubus, B. Kern, A. A. Esin +2
The X-ray emission from X-ray binaries may originate in flares occurring when magnetic loops anchored in the disc reconnect. In analogy with our Sun, H alpha emission should arise…