Spectral and flux variability in NICER observations and optical spectra of RS Oph
Abstract
NICER monitoring of RS Oph in the 0.2-12 keV energy range is continuing with daily observations, with non-continuous exposure times ranging between about 1000 s and 9000 s each day. After 2021 August 17 (ATel #14864) we measured a steady, slow decrease of count rate in the 0.2-12 keV range as the X-ray source became softer (increasing in hardness ratio, namely count rate in the 0.2-1 keV band divided by count rate in the 1-12 keV band), but there were soft X-ray flares on 2021 August 26 and 27. On 2021 September 1st, the average count rate was 126.9 & plusmn; 0.5 cts/s in the 0.2-12 keV range.
- Publication:
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The Astronomer's Telegram
- Pub Date:
- September 2021
- Bibcode:
- 2021ATel14901....1P
- Keywords:
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- Nova