The Jacobsen RI photometric system

Basic Reference

Jacobsen P.-U.

Abstract

The infra-red colour index R-I is given for 330 stars, the majority of which are G and K type giants brighter than 7th apparent visual magnitude. An ITT FW 118 photomultiplier with an end-on S1 cathode cooled with dry-ice was employed. The results have been transformed to R-I in Johnson's system.

Content

Access to the data and references

Asiago Database on Photometric System (ADPS)

Indices and Parameters

R-I

Filters

R : 2 mm Schott RG 610/1 + Corning 3965 + 2 mm Schott KG 3
I : Corning 2540

Photomultiplier

ITT FW-118

Transformation

Johnson
(R-I)J = 0.761 (R-I)puj - 0.196
Six color
(R-I)six = 0.924 (R-I)puj - 0.703
Argue
(R-I)A = 0.758 (R-I)puj - 0.181

Please, send your commentsto Jean-Claude.Mermilliod@obs.unige.ch
Jean-Claude.Mermilliod@obs.unige.ch
Last update: 21 May 1996