The mass of the white dwarf in YY Dra (=DO Dra): Dynamical measurement and comparative study with X-ray estimates

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Volume 690 (October 2024)

A&A, 690 (2024) A218

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Table 2.

Best-fit parameters of the circular and elliptical fits to the radial velocity measurements.

Circular fits: $V (t) = γ + K_{abs} \sin [\frac{2 π}{P} (t - T_{0})]$ $V (t) = \gamma + K_{\mathrm{abs}} \, \mathrm{sin} \, \left[ \frac{2 \pi}{P}(t-T_{0}) \right]$
Data set	γ	K_abs	χ²/	dof
	(km s⁻¹)	(km s⁻¹)	dof
2020 February	−3(3)	181(3)	2.52	10
2021 May	−6(3)	186(2)	0.72	14
2022 May	−3(3)	184(3)	1.17	14
2021 May + 2022 May	−5(3)	185(1)	0.94	30
Elliptical fits: V(t) = γ + S₁ sin x + C₁ cos x + S₂ sin 2x + C₂ cos 2x
Data set	γ	$e = \sqrt{\frac{S_{2}^{2} + C_{2}^{2}}{S_{1}^{2} + C_{1}^{2}}}$ $e = \sqrt{\frac{S_2^2+C_2^2}{S_1^2+C_1^2}}$	χ²/	dof
	(km s⁻¹)		dof
2020 February	5(20)	0.08(8)	1.42	7
2021 May	−2(6)	0.02(2)	0.62	11
2022 May	−5(3)	0.03(2)	0.95	11
2021 May + 2022 May	−6(3)	0.03(1)	0.78	27

Notes. Numbers in brackets specify the uncertainty in the last digit, where we have quadratically added the 2.4 km s⁻¹ standard deviation to the γ errors to account for the uncertainty in the measurement of the intrinsic radial velocity of the template.

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