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Table 1
Observation log of XMM-Newton and Chandra data used for our spectral modelling of 4U 1820-30.
| Dataset | Obs. ID | Date | Exposure (ks) | Count rate (cts s−1) | Instrument | Mode |
|---|---|---|---|---|---|---|
| Chandra | ||||||
| 1 | 98 | 10∕03∕2000 | 15.0 | 37.7 | LETG/HRC-S | – |
| 2 | 1021 | 21∕07∕2001 | 9.6 | 84.3 | HETG/ACIS | TE |
| 1022 | 12∕09∕2001 | 10.7 | 107.1 | HETG/ACIS | TE | |
| 3 | 6633 | 12∕08∕2006 | 25.1 | 126.0 | HETG/ACIS | CC |
| 6634 | 20∕10∕2006 | 25.0 | 174.0 | HETG/ACIS | CC | |
| 7032 | 05∕11∕2006 | 46.2 | 148.1 | HETG/ACIS | CC | |
| 4 | 12444 | 08∕03∕2011 | 89.7 | 84.4 | LETG/ACIS | CC |
| XMM-Newton | ||||||
| 5 | 0084110201 | 09∕10∕2001 | 39.6 | 74.7 | RGS | Spec. HER+SES |
| 6 | 0551340201 | 02∕04∕2009 | 41.8 | 51.3 | RGS | Spec. HER |
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