Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..24p&link_type=abstract
Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech
Astronomy and Astrophysics
Astronomy
Scientific paper
Since 1996 a group of astronomers has been working on setting up and then using the Strömvil photometric system, a combination of the four Strömgren and three Vilnius system filters. The system was announced in Straižys et al. (1996). A summary of the work up to 2003 can be found in Sūdžius et al. (2003). The major ability of the Strömvil system is that, from photoelectric measures alone one can determine the reddening, temperature, gravity and metalicity of stars. With all the new surveys that have been made and ones yet to be made, such a system will be of great use to identify the nature of the new faint stars that will be identified and classify them by stellar type. And since the reddening can be calculated for each region, the intrinsic properties of these stars can be determined. The main observational programs underway in the Strömvil system at present are: 1. Setting up the primary standards. Kazlauskas et al. (2005) have published a list of 780 photoelectric standards in the northern hemisphere. 2. At the Vatican Advanced Technology Telescope on Mt. Graham Boyle and Philip have been making CCD Strömvil measures of open and globular clusters. Observations are taken in each run of the rich open cluster M 67. These measures are matched to the high-accuracy CCD photometry of Laugalys et al. (2004) by constraining the corrections to each flatfield to provide the needed one percent photometry in new program fields with only a few standards for zero-point calibration. 3. At Casleo, in Argentina, Philip and Pintado have been observing clusters with the 2.15 meter telescope. 4. On the data reduction side Janusz and Boyle have written the CommandLog which automates the process of data reduction for members of our group. This will ensure that all observations will be reduced in exactly the same way.
Boyle Richard P.
Davis Philip A. G.
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