The g n k m f u photometric system

Basic Reference

Dickow P., Gyldenkerne K., Hansen L., Jacobsen P.-U., et al. 1970, Astron. Astrophys. Suppl. 2, 1

Abstract

Photoelectric narrow-band observations have been carried out for 1160 late-type stars north of declination -30d. Most of the stars are of spectral type G and K, and a number of high velocity stars has been included in the programme. Measured are: the G-band break (index g), the cyanogen absorption with band head at 4216 A (index n), the break at 4000 A including the K line of CaII (index k), the metallic-line index m, and two colour indices f and u. The results are presented in a catalogue together with relevant data collected from the literature.

Content

Access to the data and references

Asiago Database on Photometric System (ADPS)

Indices and Parameters

g, n, k, m, f, u
    g = 2.5 [log I(4389) - log I(4271)] + cte
    n = 2.5 [log I(4271) - log I(4174)] + cte
    k = 2.5 [log I(3910) - log I(4057)] + cte
    m = 2.5 [log I(4517) - log I(4057)] + cte
    f = 2.5 [log I(4973) - log I(4057)] + cte
    u = 2.5 [log I(4057) - log I(3440)] + cte

Filters

3440 : Schott UG11 + WG 3
Peak wavelength : 3440 Å ; Width : 389 Å
3910 : Schott UV - PIL
Peak wavelength : 3910 Å ; Width : 55 Å
4057 : Schott PIL
Peak wavelength : 4057 Å ; Width : 73 Å
4517 : Schott PIL
Peak wavelength : 4517 Å ; Width : 80 Å
4973 : Schott PIL
Peak wavelength : 4973 Å ; Width : 95 Å
4174 : BairdAtomic B 9
Peak wavelength : 4174 Å ; Width : 40 Å
4271 : Baird Atomic B 9
Peak wavelength : 4271 Å ; Width : 27 Å
4389 : Baird Atomic B 9
Peak wavelength : 4389 Å ; Width : 47 Å

Photomultiplier

EMI 6256 S/A with a Cs-Sb cathode
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Last update: 21 May 1996