2023A&A...671A..90H


Query : 2023A&A...671A..90H

2023A&A...671A..90H - Astronomy and Astrophysics, volume 671A, 90 (2023/3-1)

SRG/eROSITA-triggered XMM-Newton observations of three Be/X-ray binaries in the LMC: Discovery of X-ray pulsations.

HABERL F., MAITRA C., KALTENBRUNNER D., BUCKLEY D.A.H., MONAGENG I.M., UDALSKI A., DOROSHENKO V., DUCCI L., KREYKENBOHM I., MAGGI P., RAU A., VASILOPOULOS G., WEBER P. and WILMS J.

Abstract (from CDS):

Context. Using data from eROSITA, the soft X-ray instrument aboard Spectrum-Roentgen-Gamma (SRG), we report the discovery of two new hard transients, eRASSU J050810.4-660653 and eRASSt J044811.1-691318, in the Large Magellanic Cloud. We also report the detection of the Be/X-ray binary RX J0501.6-7034 in a bright state.
Aims. We initiated follow-up observations to investigate the nature of the new transients and to search for X-ray pulsations coming from RX J0501.6-7034.
Methods. We analysed the X-ray spectra and light curves from our XMM-Newton observations, obtained optical spectra using the South African Large Telescope to look for Balmer emission lines and utilised the archival data from the Optical Gravitational Lensing Experiment (OGLE) for the long-term monitoring of the optical counterparts.
Results. We find X-ray pulsations for eRASSU J050810.4-660653, RX J0501.6-7034, and eRASSt J044811.1-691318 of 40.6 s, 17.3 s, and 784 s, respectively. The Hα emission lines with equivalent widths of -10.4 Å (eRASSU J050810.4-660653) and -43.9 Å (eRASSt J044811.1-691318) were measured, characteristic for a circumstellar disc around Be stars. The OGLE I- and V-band light curves of all three systems exhibit strong variability. A regular pattern of deep dips in the light curves of RX J0501.6-7034 suggests an orbital period of ∼451 days.
Conclusions. We identify the two new hard eROSITA transients eRASSU J050810.4-660653 and eRASSt J044811.1-691318 and the known Be/X-ray binary RX J0501.6-7034 as Be/X-ray binary pulsars.

Abstract Copyright: © The Authors 2023

Journal keyword(s): stars: emission-line - Be - stars: neutron - galaxies: individual: LMC - X-rays: binaries

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11178 1
2 2dFS 1777 HX? 01 03 31.5097256352 -73 01 43.688390808 14.09 15.17 15.41   15.65 B0(V) 10 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7084 0
4 NAME Magellanic Bridge HI 03 11 -77.5           ~ 449 1
5 eRASSt J044811.1-691318 X 04 48 10.67 -69 13 18.0           ~ 1 0
6 MACHO 44.1741.17 HXB 04 51 06.80 -69 48 03.2     14.70     ~ 19 1
7 NAME LMC 7 Supergiant Shell HII 04 53 41 -69 35.2           ~ 26 0
8 OGLE BRIGHT-LMC-MISC-414 HXB 04 57 36.9542985456 -69 27 27.513739692     13.751   13.547 ~ 5 0
9 NAME LMC 1 Supergiant Shell sh 04 59 41 -65 44.7           ~ 38 0
10 SV* HV 2289 HXB 05 01 23.8898 -70 33 34.206   14.4 14.5     B0Ve 29 0
11 2MASS J05080993-6606523 XB* 05 08 09.93744 -66 06 52.3152           ~ 11 0
12 NAME LMC 5 Supergiant Shell sh 05 22 42 -66 05.6           ~ 53 0
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17478 0
14 EQ J052914-662446 XB* 05 29 14.9 -66 24 46           ~ 5 0
15 NAME LMC 4 Supergiant Shell sh 05 31 33 -66 40.5           ~ 176 0

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