A long-term optical and X-ray ephemeris of the polar EK Ursae Majoris

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Volume 507 / No 1 (November III 2009)

A&A, 507 1 (2009) 385-388

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Table 1:

Timings of optical minima and X-ray/EUV dips of EK UMa quoted as terrestrial time at the solar-system barycenter.
Cycle	BJD(TT)	Error		W	$\rm O-C$		$\rm O-C-\Delta T_{\rm o,x}$		B	Instrument
number	(days)	(days)	(phase)		(days)	(phase)	(days)	(phase)
-137044	43991.898920	0.001590	0.019989	0	0.002254	0.028331	0.000151	0.001894	X	EINSTEIN⁽¹⁾
-106532	46418.943640	0.003000	0.037715	1	-0.000242	-0.003038	-0.000242	-0.003038	O	Morris et al.
-84181	48196.835820	0.001590	0.019989	0	0.003491	0.043886	0.001388	0.017449	X	RASS⁽²⁾
-77149	48756.187740	0.000350	0.004400	1	0.001844	0.023188	-0.000258	-0.003249	X	ROSAT
-74652	48954.809360	0.001590	0.019989	0	0.002040	0.025649	-0.000063	-0.000788	X	ROSAT⁽¹⁾
-72610	49117.238510	0.000350	0.004400	1	0.002296	0.028867	0.000193	0.002430	X	ROSAT
-65258	49702.046290	0.000500	0.006286	1	0.002423	0.030456	0.000320	0.004019	X	EUVE
-46777	51172.099370	0.000550	0.006914	1	0.002422	0.030453	0.000319	0.004016	X	EUVE
-46359	51205.348030	0.000580	0.007292	1	0.001681	0.021132	-0.000422	-0.005305	X	EUVE
-45992	51234.541220	0.000350	0.004400	1	0.002215	0.027842	0.000112	0.001405	X	EUVE
-45673	51259.915480	0.000350	0.004400	1	0.001931	0.024282	-0.000171	-0.002155	X	EUVE
-45247	51293.801400	0.000460	0.005783	1	0.002098	0.026374	-0.000005	-0.000063	X	EUVE
-51	54888.870790	0.000350	0.004400	1	-0.000154	-0.001938	-0.000154	-0.001938	O	MONET/N
-1	54892.847380	0.000690	0.008674	1	-0.000765	-0.009621	-0.000765	-0.009621	O	MONET/N
0	54892.927690	0.000350	0.004400	1	0.000001	0.000009	0.000001	0.000009	O	MONET/N
1	54893.007530	0.000350	0.004400	1	0.000297	0.003730	0.000297	0.003730	O	MONET/N
24	54894.836640	0.000350	0.004400	1	-0.000106	-0.001331	-0.000106	-0.001331	O	MONET/N
200	54908.836120	0.000350	0.004400	1	-0.000374	-0.004699	-0.000374	-0.004699	O	MONET/N
201	54908.916110	0.000350	0.004400	1	0.000072	0.000907	0.000072	0.000907	O	MONET/N
275	54914.803220	0.000690	0.008674	1	0.000925	0.011623	0.000925	0.011623	O	MONET/N
276	54914.882060	0.000350	0.004400	1	0.000220	0.002772	0.000220	0.002772	O	MONET/N
277	54914.961360	0.000350	0.004400	1	-0.000024	-0.000296	-0.000024	-0.000296	O	MONET/N
564	54937.790620	0.000350	0.004400	1	0.000102	0.001282	0.000102	0.001282	O	MONET/N
565	54937.870370	0.000350	0.004400	1	0.000308	0.003872	0.000308	0.003872	O	MONET/N
576	54938.744750	0.000350	0.004400	1	-0.000296	-0.003725	-0.000296	-0.003725	O	MONET/N
577	54938.824110	0.000690	0.008674	1	-0.000480	-0.006038	-0.000480	-0.006038	O	MONET/N
615	54941.847300	0.000350	0.004400	1	0.000037	0.000463	0.000037	0.000463	O	MONET/N

⁽¹⁾ Based on the start of the bright phase at $\phi=-0.37\pm 0.02$ relative to the center of the X-ray dip. Not used in deriving the ephemeris; ⁽²⁾ ROSAT All Sky Survey. Not used in deriving the ephemeris.

Source LaTeX | All tables | In the text

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