The INES system -: II.: Ripple correction and absolute calibration for IUE high resolution spectra

被引:22
作者
Cassatella, A
Altamore, A
González-Riestra, R
Ponz, JD
Barbero, J
Talavera, A
Wamsteker, W
机构
[1] CNR, Ist Astrofis Spaziale, I-00133 Rome, Italy
[2] Univ Roma Tre, Dipartimento Fis E Amaldi, I-00146 Rome, Italy
[3] VILSPA, Lab Astrofis Espacial & Fis Fundamental, E-28080 Madrid, Spain
[4] VILSPA, European Space Agcy, E-28080 Madrid, Spain
[5] Univ Almeria, Dept Fis Aplicada, E-04120 Almeria, Spain
[6] VILSPA, ESA, IUE Observ, E-28080 Madrid, Spain
来源
ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES | 2000年 / 141卷 / 02期
关键词
methods : data analysis; techniques : image processing; ultraviolet : general;
D O I
10.1051/aas:2000316
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this paper we document the results of the study which led to the ripple correction and absolute calibration algorithms applied to the high resolution spectra processed with the NEWSIPS software for the Final archive of the IUE Project. In this analysis, based on a very large number of spectral we find that both the It and alpha parameters (not only the former as previously believed) vary with order number. This fact, together with the finding that the central peaks of the blaze function vary also as a function of the THDA temperature (for the SWP camera) and of the date of observations (for the LWP and LWR cameras), makes the ripple correction algorithm more complex than previously considered but, at the same time, considerably more reliable. As for the high resolution absolute calibration, the method followed is similar to the one implemented in IUESIPS. The internal accuracy of the high resolution calibration is about 4%. We note that the ripple correction and absolute calibration algorithms here described apply also to IUE data processed and distributed with the INES system.
引用
收藏
页码:331 / 341
页数:11
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