Unveiling the white dwarf in the eclipsing polar HU Aquarii

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Table 3.

Best-fit parameters for the r-band light curve.

Parameter	Unit	14 May 2005	15 May 2005	16 May 2005	17 May 2005
Spot longitude	deg	$15 . 3_{- 0.5}^{+ 0.6}$ $15.3^{+0.6}_{-0.5}$	16.9 ± 0.4	14.6 ± 0.2	12.4 ± 0.6
Spot latitude	deg	$69 . 0_{- 0.3}^{+ 0.2}$ $69.0^{+0.2}_{-0.3}$	68.3 ± 0.2	67.3 ± 0.1	68.2 ± 0.3
Spot FWHM	deg	$3 . 2_{- 0.7}^{+ 1.0}$ $3.2^{+1.0}_{-0.7}$	4.2 ± 0.4	3.4 ± 0.1	2.9 ± 0.3
Spot T_cen	10⁶ K	$2 . 9_{- 0.6}^{+ 0.7}$ $2.9^{+0.7}_{-0.6}$	$2 . 2_{- 0.3}^{+ 0.5}$ $2.2^{+0.5}_{-0.3}$	5.8 ± 0.4	$10 . 1_{- 1.6}^{+ 2.1}$ $10.1^{+2.1}_{-1.6}$

Notes. Best-fit parameters for the cyclotron emission region based on fitting the ULTRACAM r-band light curves of HU Aqr. We note that the temperature of the spot is purely a flux scaling factor and assumes blackbody emission, which is not an accurate representation of cyclotron emission.

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