2020A&A...640A..35R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET13:10:00

2020A&A...640A..35R - Astronomy and Astrophysics, volume 640A, 35-35 (2020/8-1)

Optical counterpart to Swift J0243.6+6124.

REIG P., FABREGAT J. and ALFONSO-GARZON J.

Abstract (from CDS):


Context. Swift J0243.6+6124 is a unique system. It is the first and only ultra-luminous X-ray source in our Galaxy. It is the first and only high-mass Be X-ray pulsar showing radio jet emission. It was discovered during a giant X-ray outburst in October 2017. While there are numerous studies in the X-ray band, very little is known about the optical counterpart.
Aims. Our aim is to characterize the variability timescales in the optical and infrared bands in order to understand the nature of this intriguing system.
Methods. We performed optical spectroscopic observations to determine the spectral type. Long-term photometric light curves together with the equivalent width of the Hα line were used to monitor the state of the circumstellar disk. We used BVRI photometry to estimate the interstellar absorption and distance to the source. Continuous photometric monitoring in the B and V bands allowed us to search for intra-night variability.
Results. The optical counterpart to Swift J0243.6+6124 is a V=12.9, O9.5Ve star, located at a distance of ∼5kpc. The optical extinction in the direction of the source is AV=3.6mag. The rotational velocity of the O-type star is 210km/s. The long-term optical variability agrees with the growth and subsequent dissipation of the Be circumstellar disk after the giant X-ray outburst. The optical and X-ray luminosity are strongly correlated during the outburst, suggesting a common origin. We did not detect short-term periodic variability that could be associated with nonradial pulsations from the Be star photosphere.
Conclusions. The long-term optical and infrared pattern of variability of Swift J0243.6+6124 is typical of Be/X-ray binaries. However, the absence of nonradial pulsations is unusual and adds another peculiar trait to this unique source.

Abstract Copyright: © ESO 2020

Journal keyword(s): stars: emission-line - Be - binaries: close - X-rays: binaries - stars: individual: Swift J0243.6+6124 - stars: neutron

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 669 0
2 EM* GGA 104 HXB 01 47 00.2121223849 +61 21 23.661992704 11.76 12.09 11.366 11.00 10.52 B1IIIe 172 0
3 Gaia DR2 465628266540345216 * 02 43 38.2313765362 +61 26 40.687085894           ~ 1 0
4 SWIFT J0243.6+6124 Psr 02 43 40.4249772475 +61 26 03.757301990   13.71 12.84 12.57   ~ 57 0
5 V* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 407 1
6 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 909 0
7 LS V +44 17 HXB 04 40 59.3295352454 +44 31 49.258751047 11.02 11.42 10.73 10.28 9.76 B0.2Ve 99 0
8 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 879 0
9 IGR J06074+2205 HXB 06 07 26.6120418797 +22 05 47.759512772   12.85 12.21 11.80 11.32 B0.5Ve 32 1
10 V* V572 Pup HXB 08 12 28.3576629560 -31 14 52.138780764 12.14 13.03 12.74 12.44   B0.2IVe 62 0
11 WRAY 15-793 HXB 11 20 57.1736252056 -61 55 00.165172193 12.81 13.06 12.12     O9.5III/Ve 175 0
12 HD 102567 Be* 11 48 00.0214627917 -62 12 24.900348094 8.24 9.06 9.00 9.62   O/Bne 291 0
13 V* V850 Cen HXB 13 01 17.0966951298 -61 36 06.636402972   15.6       B2Vne 276 0
14 GSC 03588-00834 HXB 21 03 35.7101268891 +45 45 05.568943629   15.34 14.20 13.49 12.75 B0Ve 150 0
15 2MASS J21342037+4738002 HXB 21 34 20.3718012674 +47 38 00.206178882   14.68 14.16 13.80 13.42 ~ 16 0
16 4U 2238+60 HXB 22 39 20.8444678371 +61 16 26.607919757   16.26 14.80 13.89 12.92 Be 44 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-13:10:00

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