eta Carinae obs. around the 2014 X-ray minimum : J/ApJ/838/45

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Authors : Corcoran M.F. orcid , Liburd J., Morris D. (hide) , Liburd J., Morris D. et..al

VizieR DOI : 10.26093/cds/vizier.18380045
Bibcode : 2017ApJ...838...45C (ADS) (Simbad) (Objects)
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CDS Keywords : Binaries, X-ray
UAT : X-ray binary stars

Observation (OC)

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Inserted into VizieR : 27-Nov-2017
Last modification : 12-Mar-2018

The 2014 X-ray minimum of {eta} Carinae as seen by Swift. (2017)

Keywords : binaries general; stars: individual: "eta Carinae", HD 93308; stars: winds, outflows; stars: early-type; stars: massive; X-rays: stars

Abstract:We report on Swift X-ray Telescope observations of Eta Carinae ({eta}Car), an extremely massive, long-period, highly eccentric binary obtained during the 2014.6 X-ray minimum/periastron passage. These observations show that {eta} Car may have been particularly bright in X-rays going into the X-ray minimum state, while the duration of the 2014 X-ray minimum was intermediate between the extended minima seen in 1998.0 and 2003.5 by Rossi X-Ray Timing Explorer (RXTE), and the shorter minimum in 2009.0. The hardness ratios derived from the Swift observations showed a relatively smooth increase to a peak value occurring 40.5 days after the start of the X-ray minimum, though these observations cannot reliably measure the X-ray hardness during the ...(more)
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The most recent X-ray observations of {eta} Car by Swift began in 2014 April. Observations were scheduled twice per week at the outset. The Swift log of the 2014 observations discussed here is given in Table 1. For our discussion, we also include recalibrated fluxes from Rossi X-Ray Timing Explorer (RXTE), including previously unpublished observations from 2010 through 2011. See section 2. To study both orbit-dependent and non-orbit-dependent (secular) variations, we include in Table 2 data obtained by the RXTE-PCA in the interval 1996 February 9 through 2011 December 28. We re-reduced the entire RXTE data set in a consistent way. See section 4.1. 


                


                

                    

                


                

                    

                


                

                    
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