Daresbury Laboratory ISSN 0962-6034
ANALYSIS OF ASTRONOMICAL
An informal Newsletter issued biannually by Collaborative Computational Project No. 7
on the Analysis of Astronomical Spectra.
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.
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
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
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.
- The carriers shipping the workstation from St Andrews to Armagh
dropped one of two 2Gb disk drives.
Plans to expand the ftp service had to be delayed by three months. The disk has now been replaced.
- The JANET connection to Armagh Observatiory is currently
carried on a 128 kbps line. Until the Observatory is able to obtain
a much faster connection, ftp access to large datasets will not be
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
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.
Finally, readers will find a
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