2022A&A...661A..22D


Query : 2022A&A...661A..22D

2022A&A...661A..22D - Astronomy and Astrophysics, volume 661A, 22-22 (2022/5-1)

eROSITA detection of flares from the Be/X-ray binary A0538-66.

DUCCI L., MEREGHETTI S., SANTANGELO A., JI L., CARPANO S., COVINO S., DOROSHENKO V., HABERL F., MAITRA C., KREYKENBOHM I. and UDALSKI A.

Abstract (from CDS):

In 2018, XMM-Newton observed the awakening in X-rays of the Be/X-ray binary (Be/XRB) A0538-66. It showed bright and fast flares close to periastron with properties that had never been observed in other Be/XRBs before. We report the results from the observations of A0538-66 collected during the first all-sky survey of eROSITA, an X-ray telescope (0.2-10 keV) on board the Spektrum-Roentgen-Gamma satellite. eROSITA caught two flares within one orbital cycle at orbital phases φ = 0.29 and φ = 0.93 (where φ = 0 corresponds to periastron), with peak luminosities of ∼2-4 x 1036 erg s–1 (0.2-10 keV) and durations of 42 ≤ Δtfl ≤ 5.7 x 104 s. The flare observed at φ ~= 0.29 shows that the neutron star can accrete considerably far from periastron, although it is expected to be outside of the circumstellar disk, thus providing important new information about the plasma environment surrounding the binary system. We also report the results from the photometric monitoring of A0538-66 carried out with the REM, OGLE, and MACHO telescopes from January 1993 until March 2020. We found that the two sharp peaks that characterize the orbital modulation in the optical occur asymmetrically in the orbit, relative to the position of the donor star.

Abstract Copyright: © ESO 2022

Journal keyword(s): accretion, accretion disks - stars: neutron - X-rays: binaries - X-rays: individuals: 1A 0538-66

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 LIN 139 HXB 00 49 42.0078068952 -73 23 14.676382752 14.09 15.00 14.98   14.70 O9.5-B0.5III-V 70 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10314 1
3 RX J0058.2-7231 HXB 00 58 12.5869662000 -72 30 48.759613812 13.91 14.98 14.87   14.62 B0IIIe 59 0
4 [HP99] 946 Be* 05 20 30.9009 -69 31 54.999   14.41 14.40     O8e 56 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16153 1
6 RX J0535.6-6651 HXB 05 35 40.9970566152 -66 51 53.547559416   13.7 13.8     B0.5IIIe 281 0

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2022.08.09-16:49:20

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