Optical and Ultraviolet Photometry of Isolated Neutron Stars
We propose ultraviolet and B-band observations of 5 nearby, thermally emitting neutron stars. These data will measure the Rayleigh-Jeans tails of their spectra, providing a vital complement to X-ray spectroscopy and helping to constrain atmospheric models, working toward the ultimate goal of unraveling the physics of neutron stars. With these data we will have good-quality optical and UV data for the full sample of these objects, allowing detailed comparisons between them. Finally, the data should allow us to measure proper motions for one or two objects, and will serve as the reference data for the remaining objects; such proper motions allow ages to be determined for these objects by tracing them back to likely birth locations.
We will be observing 5 different neutron stars in the optical (ACS/WFC/F475W) and UV (ACS/SBC/F140LP), to measure photometry and astrometry. For each object we will be observing for 1, 2, or 3 orbits in each band depending on how bright the objects are. We use the WFC1 aperture so that the source is not near the chip gap and we can have the largest number of astrometric references on the same CCD. We dither 4 times per orbit for good pixel-phase coverage, and then offset with POSTARGs in the subsequent orbits for even better coverage where applicable.
HOT STARS
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NEUTRON STAR
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NEUTRON STAR
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J2000
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J2000
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NEUTRON STAR
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F140LP
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F140LP
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