Daresbury Laboratory ISSN 0962-6034

NEWSLETTER ON ANALYSIS OF ASTRONOMICAL SPECTRA

An informal Newsletter issued biannually by Collaborative Computational Project No. 7 on the Analysis of Astronomical Spectra.

Number 24, November 1996


Editorial

Workshop Proceedings

This issue of the Newsletter includes reports of papers presented at a workshop held in Canterbury at the end of September, 1996. The topic of that meeting was ``Astrophysical Spectroscopy at Sub-Millimetre and Far-Infrared Wavelengths''. The meeting provided a forum in which observations made possible with recent advances in detector technology and new instruments such as ISO could be explored using computational tools which simulate the structure, chemistry and emergent radiation from astronomical sources. These included hot protostellar cores, the extended envelopes of red supergiants, the interstellar medium in the Galaxy and Magellanic Clouds, and cold gas and dust in high-z quasars. A remarkable illustration of the successful modelling of maser emission observed in Mira-type variables is given in papers by Yates and Richards.

Software developments

mmline One paper presented in Kent (Skinner) describes a computer code designed to solve the radiative transfer equations for pure rotational line emission from an AGB star wind. This code ( MMLINE) was originally written by Kay Schoenberg (1988 A&A 195, 198). It was donated to CCP7 in 1991, but in an unuseable state. Chris Skinner has sucessfully salvaged and improved MMLINE, which is now available in the CCP7 library. The URL is

ftp:://ccp7.arm.ac.uk/ccp7/Soft/mmline.tar.Z

atlas.lester John Lester (Toronto) has kindly made available his versions of Kurucz' model atmosphere programs (ATLAS9, BALMER9, WIDTH9, and SYNTHE) which have been extensively rewritten and are specifically implemented for Unix-based computers. Prospective users should be wary that both Kurucz's and Lester's versions of these codes continue to be improved and will not necessarily give identical results. The author has provided additional scripts to streamline the generation of synthetic spectra using Lester's version of SYNTHE. A read.me file is available on-line in the CCP7 ftp server. URL's are

ftp:://ccp7.arm.ac.uk/ccp7/Soft/atlas.lester.tar.Z
ftp:://ccp7.arm.ac.uk/ccp7/Soft/atlas.lester.read.me

Move to Armagh

As intimated in the last issue of the Newsletter, the author moved to the Armagh Observatory at the beginning of July 1996. The CCP7 Sun workstation which hosts the CCP7 software library, an anonymous ftp service and a number of useful WWW pages moved at the same time. The ftp and WWW services were reinstated by the end of July. Two problems affecting the service were encountered.

ftp service expanding

With the planned 2Gb disk space now available for the ftp and WWW service, a major expansion of the service has been implemented. For example, many datasets distributed by Kurucz' on CD-ROM are now available on-line. Further information is provided on the WWW at URL http://star.arm.ac.uk/ccp7/www/atlas.html.

Steps are also being taken to provide a transatlantic mirror of the CCP7 ftp and WWW site. Watch the CCP7 WWW pages for more information.

User survey

Finally, readers will find a questionnaire attached to the end of this Newsletter. CCP7 exists to pursue a specific scientific research programme and to provide a service to the astronomical community. In order to ensure that this service is as useful as possible, the CCP7 Working Group would appreciate your views on the type of service that is being and should be provided.

Please take five minutes to complete the questionnaire and return it as soon as possible.

Simon Jeffery (CCP7 Secretary)
13 November 1996


CCP7 Newsletter #24
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