High-resolution X-ray spectra of the compact binary supersoft X-ray source CAL 87

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Volume 690 (October 2024)

A&A, 690 (2024) A9

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Table 1.

Fitting results for the emission lines.

Line	λ₀ (Å)	λ_m (Å)	v_shift (km s⁻¹)	Flux	λ_m (Å)	v_shift (km s⁻¹)	Flux
		2001-08-13/14			2003-04-18/19
		Chandra ACIS+LETG			XMM-Newton RGS

Fe XVII	15.0140	15.08x̃₂	1317 $_{- 1189}^{+ 1180}$ $^{+1180}_{-1189}$	0.20 $_{- 0.10}^{+ 0.10}$ $^{+0.10}_{-0.10}$	15.05 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$	719 $_{- 198}^{+ 201}$ $^{+201}_{-198}$	0.23 $_{- 0.05}^{+ 0.06}$ $^{+0.06}_{-0.05}$
Fe XVII?	15.2610	15.32 $_{- 0.04}^{+ 0.03}$ $^{+0.03}_{-0.04}$	1159 $_{- 785}^{+ 589}$ $^{+589}_{-785}$	0.25 $_{- 0.08}^{+ 0.09}$ $^{+0.09}_{-0.08}$	15.29 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$	570 $_{- 194}^{+ 198}$ $^{+198}_{-194}$	0.33 $_{- 0.06}^{+ 0.07}$ $^{+0.07}_{-0.06}$
O VIII Lyβ	16.0055	16.05 $_{- 0.07}^{+ 0.08}$ $^{+0.08}_{-0.07}$	834 $_{- 1311}^{+ 1498}$ $^{+1498}_{-1311}$	0.18 $_{- 0.13}^{+ 0.15}$ $^{+0.15}_{-0.13}$	16.04 $_{- 0.01}^{+ 0.02}$ $^{+0.02}_{-0.01}$	646 $_{- 187}^{+ 374}$ $^{+374}_{-187}$	0.22 $_{- 0.05}^{+ 0.05}$ $^{+0.05}_{-0.05}$
Fe XVII	16.7800	16.81 $_{- 0.05}^{+ 0.05}$ $^{+0.05}_{-0.05}$	540 $_{- 885}^{+ 890}$ $^{+890}_{-885}$	0.12 $_{- 0.08}^{+ 0.08}$ $^{+0.08}_{-0.08}$	16.82 $_{- 0.02}^{+ 0.01}$ $^{+0.01}_{-0.02}$	715 $_{- 351}^{+ 179}$ $^{+179}_{-351}$	0.23 $_{- 0.05}^{+ 0.07}$ $^{+0.07}_{-0.05}$
Fe XVII	17.0510	17.11 $_{- 0.03}^{+ 0.03}$ $^{+0.03}_{-0.03}$	1037 $_{- 519}^{+ 525}$ $^{+525}_{-519}$	0.40 $_{- 0.13}^{+ 0.12}$ $^{+0.12}_{-0.13}$	17.09 $_{- 0.02}^{+ 0.01}$ $^{+0.01}_{-0.02}$	686 $_{- 351}^{+ 178}$ $^{+178}_{-351}$	0.43 $_{- 0.06}^{+ 0.09}$ $^{+0.09}_{-0.06}$
O VIII Lyα	18.9671	19.03 $_{- 0.04}^{+ 0.03}$ $^{+0.03}_{-0.04}$	994 $_{- 630}^{+ 472}$ $^{+472}_{-630}$	0.85 $_{- 0.13}^{+ 0.12}$ $^{+0.12}_{-0.13}$	19.03 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$	994 $_{- 161}^{+ 154}$ $^{+154}_{-161}$	1.17 $_{- 0.09}^{+ 0.08}$ $^{+0.08}_{-0.09}$
O VII r	21.6015	21.75 $_{- 0.08}^{+ 0.09}$ $^{+0.09}_{-0.08}$	2060 $_{- 1110}^{+ 1249}$ $^{+1249}_{-1110}$	0.54 $_{- 0.42}^{+ 0.44}$ $^{+0.44}_{-0.42}$	21.69 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$	1228 $_{- 137}^{+ 141}$ $^{+141}_{-137}$	0.46 $_{- 0.12}^{+ 0.12}$ $^{+0.12}_{-0.12}$
O VII i	21.8010	…	…	…	21.82	261	0.14 $_{- 0.09}^{+ 0.09}$ $^{+0.09}_{-0.09}$
O VII f	22.0974	…	…	…	22.16	851	0.22 $_{- 0.10}^{+ 0.11}$ $^{+0.11}_{-0.10}$
N VI	22.8070	22.85 $_{- 0.04}^{+ 0.05}$ $^{+0.05}_{-0.04}$	565 $_{- 523}^{+ 651}$ $^{+651}_{-523}$	…	22.86 $_{- 0.02}^{+ 0.02}$ $^{+0.02}_{-0.02}$	697 $_{- 260}^{+ 256}$ $^{+256}_{-260}$	0.26 $_{- 0.07}^{+ 0.09}$ $^{+0.09}_{-0.07}$
Ar XVI	23.5060	23.61 $_{- 0.09}^{+ 0.08}$ $^{+0.08}_{-0.09}$	1326 $_{- 1143}^{+ 1018}$ $^{+1018}_{-1143}$	0.11 $_{- 0.09}^{+ 0.09}$ $^{+0.09}_{-0.09}$	23.61 $_{- 0.04}^{+ 0.03}$ $^{+0.03}_{-0.04}$	1330 $_{- 510}^{+ 386}$ $^{+386}_{-510}$	0.16 $_{- 0.08}^{+ 0.07}$ $^{+0.07}_{-0.08}$
N VII Lyα	24.7792	24.84 $_{- 0.05}^{+ 0.02}$ $^{+0.02}_{-0.05}$	736 $_{- 602}^{+ 246}$ $^{+246}_{-602}$	0.48 $_{- 0.21}^{+ 0.21}$ $^{+0.21}_{-0.21}$	24.86 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$	978 $_{- 124}^{+ 119}$ $^{+119}_{-124}$	0.48 $_{- 0.07}^{+ 0.07}$ $^{+0.07}_{-0.07}$

Notes. Rest, measured wavelength, line shifts, and fluxes ×10⁻¹³ ergs cm⁻² s⁻¹ for the emission lines identified and measured in the grating spectra of CAL 87. Fluxes are calculated with the cflux command in XSPEC. The errors are at a 90% confidence level.

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