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M. Barylak and J. D. Ponz
ESA Villafranca
P.O. Box 50727, 28080 Madrid, Spain
This contribution describes the IUEFA project at Villafranca, and the plans to make the archive available to the scientific community under through the INES (IUE New Extracted Spectra) project.
There is no doubt that scientific archives represent an invaluable resource. The IUEFA will provide important reference information for current and future UV space missions. No maintenance and support of a data archive was foreseen in IUE's original mission plan. Hence, in the context of the IUEFA project, a special effort has been dedicated to the definition of the mission archive and its distribution to the scientific community world-wide. It has been said and truly written that ``IUE has led the way in promoting archiving services''.
The IUE Final Archive (IUEFA) was defined as a project between NASA, ESA and PPARC, according to the following main requirements:
Based upon the previous requirements, NEWSIPS (Garhart et al. 1997) was developed and implemented at both GSFC and VILSPA observing stations. The main elements for the production system, depicted in Figure 1, are: (1) Raw archive stored on optical disks, provides the input images to the NEWSIPS production pipeline. (2) Image parameters, defining the main object characteristics and instrumental setup. These parameters determine the calibration options, provide quality control information and are maintained under a relational data base management system (DBMS) (Barylak, 1996). (3) Pipeline (NEWSIPS), implemented under MIDAS. (4) Master archive, stored on optical disks. (5) On-line data server with extracted spectra - both two-dimensional and absolutely calibrated fluxes - available on-line.
The number of observations in the archive is about 70,000 low and 30,000 high resolution images. The volume of the information of the master archive is shown in Table 1, indicating the size in Gbytes for each file type.
| Data set | Low res. | High res. | Total |
| Raw images | 42.0 | 18.0 | 60.0 |
| Linearized | 168.0 | 72.0 | 240.0 |
| 2D spectra | 16.8 | 72.0 | 88.8 |
| 1D spectra | 4.2 | 36.0 | 40.2 |
| Total | 231.0 | 198.0 | 429.0 |
At the time of writing, the raw archive is complete and all image parameters have been verified. Local processing at Villafranca and data exchange with GSFC are well advanced, so that the low-dispersion set is nearly finished and more than 50 % of the high-dispersion spectra have been processed and are available on the data server. The master archive will be completed by December 1997.
Access to the ESA IUE data server (Yurrita & Barylak, 1997) is available at http://iuearc.vilspa.esa.es/. This server implements the following basic features:
After completion of IUEFA, data distribution is planned following the original, low-cost, distributed archive concept of ULDA/USSP (Wamsteker, et al. 1989).
The INES (IUE New Extracted Spectra) project will contain (1) the re-extracted set of low-dispersion spectra together with all high-dispersion observations re-sampled to the low-dispersion domain, (2) the two dimensional line-by-line spectra, and (3) a new version of high-dispersion spectra, with orders concatenated.
INES will be based on the following structure:
The suggested configuration for the National host data server is based upon a PC running the Linux operating system. Our prototype is running under the free DBMS MySQL employing Perl to interface with both the APACHE HTTP server and the WWW browser. This data server also implements the syntax proposed for information exchange among remote astronomical services (see ASU http://vizier.u-strasbg.fr/doc/asu.html). Furthermore, the access catalogue includes references to IUE spectra included in scientific publications which can be retrieved via the standard BIBCODE as defined in the NASA Astrophysics Data System (ADS) (Eichhorn et al. 1998).
Barylak, M. 1996, ESA IUE Newsletter No. 46, February 1996, 19
Eichhorn, G., Accomazzi, A., Grant, C.S., Kurtz, M.J., & Murray, S.S. 1998, this volume
Garhart, M.P., Smith, M.A., Levay, K.L., & Thompson, R.W. 1997, NEWSIPS Information Manual, version 2.0
González-Riestra, R., Cassatella, A., & de la Fuente, A. 1992, Record of the IUE Three Agency Coordination Meeting, November 1992, D-78
Kinney, A.L., Bohlin R.C., & Neil, J.D. 1991, PASP, 103, 694
Linde, P., & Dravins, D. 1990, ESA SP-310, 605
NASA/Science Office of Standards and Technology 1995, Definition of the Flexible Image Transport System (FITS), NOST 100-1.1
Ponz, J.D., Thompson, R.W., & Muñoz, J.R. 1994, A&AS, 105, 53
Wamsteker, W., Driessen, C., Muñoz, J.R., Hassall, B.J.M., Pasian, F., Barylak, M., Russo, G., Egret, D., Murray, J., Talavera, A., & Heck, A. 1989, A&A, 79, 1
Yurrita, I., & Barylak, M. 1997, Access to the ESA IUE Data Server, ESA IUE Newsletter No. 47, January 1997, 34.
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