Bibcode
Siegel, Michael H.; Hoversten, Erik A.; Roming, Peter W. A.; Landsman, Wayne B.; Allende-Prieto, C.; Breeveld, Alice A.; Brown, Peter; Holland, Stephen T.; Kuin, N. P. M.; Page, Mathew J.; Vanden Berk, Daniel E.
Bibliographical reference
The Astrophysical Journal, Volume 725, Issue 1, pp. 1215-1225 (2010).
Advertised on:
12
2010
Journal
Citations
8
Refereed citations
5
Description
At present, the precision of deep ultraviolet photometry is somewhat
limited by the dearth of faint ultraviolet standard stars. In an effort
to improve this situation, we present a uniform catalog of 11 new faint
(u ~ 17) ultraviolet standard stars. High-precision photometry of these
stars has been taken from the Sloan Digital Sky Survey and Galaxy
Evolution Explorer archives and combined with new data from the Swift
Ultraviolet Optical Telescope to provide precise photometric measures
extending from the near-infrared to the far-ultraviolet. These stars
were chosen because they are known to be hot (20, 000 < T
eff < 50, 000 K) DA white dwarfs with published Sloan
spectra that should be photometrically stable. This careful selection
allows us to compare the combined photometry and Sloan spectroscopy to
models of pure hydrogen atmospheres to both constrain the underlying
properties of the white dwarfs and test the ability of white dwarf
models to predict the photometric measures. We find that the photometry
provides good constraints on white dwarf temperatures, which
demonstrates the ability of Swift/UVOT to investigate the properties of
hot luminous stars. We further find that the models reproduce the
photometric measures in all 11 passbands to within their systematic
uncertainties. Within the limits of our photometry, we find the standard
stars to be photometrically stable. This success indicates that the
models can be used to calibrate additional filters to our standard
system, permitting easier comparison of photometry from heterogeneous
sources. The largest source of uncertainty in the model fitting is the
uncertainty in the foreground reddening curve, a problem that is
especially acute in the UV.
Related projects
Chemical Abundances in Stars
Stellar spectroscopy allows us to determine the properties and chemical compositions of stars. From this information for stars of different ages in the Milky Way, it is possible to reconstruct the chemical evolution of the Galaxy, as well as the origin of the elements heavier than boron, created mainly in stellar interiors. It is also possible to
Carlos
Allende Prieto