Photoelectric UBVRI sequences in the galactic globular clusters IC 4499 and NGC 6723
F. Alvarado, Erich Wenderoth, G. Alcaíno, W. Liller
Abstract
F. Alvarado, Erich Wenderoth, G. Alcaíno, W. Liller
Abstract
UBVRI photoelectric sequences for the galactic globular clusters IC 4499 and NGC 6723 are herewith presented. Both of them include fields suitable for charge coupled devices (CCD) coverage. The number of stars and the range of magnitude and colors are: IC 4499, eight stars with 12.5 less than V less than 15.3; 0.7 less than B - V less than 1.7; NGC 6723, seventeen stars with 10.4 less than V less than 15.6; 0.4 less than B - V less than 1.6. The stars were measured an average of eight times on at least four different nights. One stars of IC 4499 and twelve in NGC 6723 are in common with previous works.
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UBVRI photoelectric sequences for the galactic globular clusters IC 4499 and NGC 6723 are herewith presented. Both of them include fields suitable for charge coupled devices (CCD) coverage. The number of stars and the range of magnitude and colors are: IC 4499, eight stars with 12.5 less than V less than 15.3; 0.7 less than B - V less than 1.7; NGC 6723, seventeen stars with 10.4 less than V less than 15.6; 0.4 less than B - V less than 1.6. The stars were measured an average of eight times on at least four different nights. One stars of IC 4499 and twelve in NGC 6723 are in common with previous works.
Key concepts: Physics, Globular cluster, Astrophysics, Photoelectric effect, Astronomy, Stars, Optics