Fig. 1 from Hubble Space Telescope Observations of the Main Sequence of M4

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Hubble Space Telescope Observations of the Main Sequence of M4

Authors: H. B. Richer, G. G. Fahlman, J. Brewer, S. Davis, J. Kalirai, P. B. Stetson, B. M. S. Hansen, R. M. Rich, R. A. Ibata, B. K. Gibson, and M. Shara

Richer et al. 2004 The Astronomical Journal 127 2771.

Provider: AAS Journals

Caption: Fig. 1.

Variation in the sky background as a function of time (mean Julian days) or angle between the Sun and M4 on the long‐exposure frames in the outer annulus in both F606W and F555W. The decrease is due to the lowering of the zodiacal light background as the Sun‐M4 angle increased. The few jumps in the brightness levels are due to observations taken close to the bright limb of the Earth.

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