Near-infrared JHKs observations of MAXI J0206-749 (= RX J0209.6-7427)
ATel #13315; K. Morihana (Nagoya U.), T. Mihara (RIKEN), Y. Moritani (Kavli IPMU), M. Nakajima (Nihon U.), A. Kawachi (Tokai U.), K. Miyakawa (Tokyo Tech), and T. Nagayama (Kagoshima U.)
on 27 Nov 2019; 08:15 UT
Credential Certification: Motoki Nakajima (nakajima.motoki@nihon-u.ac.jp)
Subjects: Infra-Red, Binary, Neutron Star, Transient, Pulsar
From November 22 to 25, we observed the field of the NIR counterpart (2MASS J02093456-7427118) of the new X-ray transient MAXI J0206-749 (ATel #13300) with the near-infrared (J, H, Ks) simultaneous imaging camera SIRIUS attached to 1.4 m telescope IRSF (InfraRed Survey Facility) in Sutherland observatory, South Africa. The transient was identified as RX J0209.6-7427 (ATel #13303) and the 9s pulsation was discovered (ATel #13309). Therefore it is a Be X-ray binary pulsar in the Magellanic bridge (Kahabka and Hilker 2005).
We detected a near-infrared source at the position of MAXI J0206-749 in the combined images whose total exposure time is nearly 900s each night. The observation periods and the magnitudes (Vega) are tabled below. The magnitudes are calibrated against 2MASS point sources in the field. The source is a little brighter on 2019-11-24 on Ks band and is ongoing NIR little flare, comparing with NIR magnitudes in quiescent (J = 14.29 ± 0.04, H = 14.21 ± 0.06, K = 14.05 ± 0.07 measured from the data by 2MASS on MJD 51103.1829).
| OBS-Start (UTC) |
MJD |
J |
H |
K |
| 2019-11-22 22:15:59.00 |
58809.92777 |
14.313 ± 0.003 |
14.169 ± 0.006 |
14.048 ± 0.016 |
| 2019-11-23 22:19:36.60 |
58810.93028 |
14.299 ± 0.003 |
14.137 ± 0.006 |
14.046 ± 0.012 |
| 2019-11-24 02:17:02.70 |
58812.09517 |
14.292 ± 0.004 |
14.142 ± 0.007 |
13.998 ± 0.014 |
| 2019-11-25 02:14:16.80 |
58813.09325 |
14.277 ± 0.003 |
14.136 ± 0.004 |
14.011 ± 0.010 |
We thank prompt observations to the IRSF staff.
