期刊
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
卷 187, 期 1, 页码 149-171出版社
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/187/1/149
关键词
catalogs; instrumentation: spectrographs; methods: data analysis; stars: general; ultraviolet: stars
资金
- Space Telescope Science Institute [HST-AR-10638.01-A]
- NASA [NAG5-13058]
StarCAT is a catalog of high resolution ultraviolet spectra of objects classified as stars, recorded by Space Telescope Imaging Spectrograph (STIS) during its initial seven years of operations (1997-2004). StarCAT is based on 3184 echelle observations of 545 distinct targets, with a total exposure duration of 5.2 Ms. For many of the objects, broad ultraviolet coverage has been achieved by splicing echellegrams taken in two or more FUV (1150-1700 angstrom) and/or NUV (1600-3100 angstrom) settings. In cases of multiple pointings on conspicuously variable sources, spectra were separated into independent epochs. Otherwise, different epochs were combined to enhance the signal-to-noise ratio (S/N). A post-facto correction to the calstis pipeline data sets compensated for subtle wavelength distortions identified in a previous study of the STIS calibration lamps. An internal fluxing procedure yielded coherent spectral energy distributions (SEDs) for objects with broadly overlapping wavelength coverage. The best StarCAT material achieves 300 m s(-1) internal velocity precision; absolute accuracy at the 1 km s(-1) level; photometric accuracy of order 4%; and relative flux precision several times better (limited mainly by knowledge of SEDs of UV standard stars). While StarCAT represents a milestone in the large-scale post-processing of STIS echellegrams, a number of potential improvements in the underlying final pipeline are identified.
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