2021MNRAS.503L..51P

Query : 2021MNRAS.503L..51P

2021MNRAS.503L..51P - Mon. Not. R. Astron. Soc., 503, L51-L55 (2021/May-1)

A 2-d orbital period for a redback millisecond pulsar candidate in the globular cluster NGC 6397.

PICHARDO MARCANO M., RIVERA SANDOVAL L.E., MACCARONE T.J., ZHAO Y. and HEINKE C.O.

Abstract (from CDS):

We report optical modulation of the companion to the X-ray source U18 in the globular cluster NGC 6397. U18, with combined evidence from radio and X-ray measurements, is a strong candidate as the second redback in this cluster, initially missed in pulsar searches. This object is a bright variable star with an anomalous red colour and optical variability (∼0.2 mag in amplitude) with a periodicity ∼1.96 d that can be interpreted as the orbital period. This value corresponds to the longest orbital period for known redback candidates and confirmed systems in Galactic globular clusters and one of the few with a period longer than 1 d.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): globular clusters: general - globular clusters: individual: (NGC 6397) - X-rays: binaries pulsars

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2FGL J0846.0+2820 gam 08 46 03 +28 20.9           ~ 24 0
2 PSR J1023+0038 Psr 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 470 0
3 XSS J12270-4859 Psr 12 27 58.7476831464 -48 53 42.824592960           ~ 321 0
4 V* RS CVn RS* 13 10 36.9077924448 +35 56 05.584994412 8.57 8.51 7.93 7.7   F6IV+G8IV 753 0
5 2FGL J1417.5-4404 LXB 14 17 16.80 -44 04 40.5           ~ 58 0
6 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
7 Cl* NGC 6397 SAW V31 El? 17 40 42.6230201282 -53 40 27.291274010   16.41 15.95 16.10   ~ 22 0
8 PSR J1740-5340 Psr 17 40 44.589 -53 40 40.90   17.43   16.25   ~ 157 2
9 IGR J18245-2452 LXB 18 24 32.50 -24 52 07.8           ~ 253 0

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