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Development of a Southern Vilnius Standard Photometric System

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dc.contributor.author Forbes, Murray Charles
dc.date.accessioned 2008-08-20T03:39:12Z
dc.date.accessioned 2022-11-02T00:46:31Z
dc.date.available 2008-08-20T03:39:12Z
dc.date.available 2022-11-02T00:46:31Z
dc.date.copyright 1996
dc.date.issued 1996
dc.identifier.uri https://ir.wgtn.ac.nz/handle/123456789/28336
dc.description.abstract The Vilnius Standard Photometric System is said to have several advantages over other photometric systems; reduction procedures free of systematic errors, a homogeneous set of standard stars, accurate dereddening, spectral classification and calibration of physical parameters for normal stars, and a good detection rate of abnormal stars. To investigate these, two southern, open star clusters (Omicron Velorum and Kappa Crucis) have been measured in the Vilnius system. The observations were used to derive astrophysical parameters such as age ((45±l5)x106 and (10±3)x10 6 years respectively), composition (both solar metallicity), distance to the clusters (m-M = 5m.94±0.02 and 12m.18±0.05), interstellar reddening along our light of sight to the clusters (Ey-v = 0m.00±0.02 and 0m.31±0.09), and cluster membership probabilities for the individual stars. These compared favorably with the consensus of similar analyses made by observers using other photometric systems, with one exception being the distance to Kappa Crucis (<m-M> = 11m.59). As no stars further south than declination -26° have been measured in the (original) Vilnius System, it was necessary to calibrate the local system to the standard system by measuring equatorial stars common to both. To alleviate this problem in the future, suitable southern stars were measured to form a southern standard system. Initially bright stars evenly spread across the sky were calibrated - this will ensure any future observing programme will have nearby standards. The next phase of the programme was to calibrate the E-region stars – this is a set of stars in common use as southern standards in other photometric systems. The final phase was to calibrate a sequence of stars near the south celestial pole - producing a set of stars so that the same standards can be observed at any time during the year. This southern standard system could not be completely established in the time available (it is approximately 50% finished), due to the larger than expected uncertainties in the measurements largely caused by the atmospheric effects of the Mount Pinatubo eruption. en_NZ
dc.format pdf en_NZ
dc.language en_NZ
dc.language.iso en_NZ
dc.publisher Te Herenga Waka—Victoria University of Wellington en_NZ
dc.title Development of a Southern Vilnius Standard Photometric System en_NZ
dc.type Text en_NZ
vuwschema.type.vuw Awarded Doctoral Thesis en_NZ
thesis.degree.discipline Physics en_NZ
thesis.degree.grantor Te Herenga Waka—Victoria University of Wellington en_NZ
thesis.degree.level Doctoral en_NZ
thesis.degree.name Doctor of Philosophy en_NZ

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