2018A&A...616A.186F


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.21CEST06:23:38

2018A&A...616A.186F - Astronomy and Astrophysics, volume 616A, 186-186 (2018/8-1)

A tale of two periods: determination of the orbital ephemeris of the super-Eddington pulsar NGC 7793 P13.

FURST F., WALTON D.J., HEIDA M., HARRISON F.A., BARRET D., BRIGHTMAN M., FABIAN A.C., MIDDLETON M.J., PINTO C., RANA V., TRAMPER F., WEBB N. and KRETSCHMAR P.

Abstract (from CDS):

We present a timing analysis of multiple XMM-Newton and NuSTAR observations of the ultra-luminous pulsar NGC 7793 P13 spread over its 65 d variability period. We use the measured pulse periods to determine the orbital ephemeris, confirm a long orbital period with Porb=63.9+0.5–0.6d, and find an eccentricity of e≤0.15. The orbital signature is imprinted on top of a secular spin-up, which seems to get faster as the source becomes brighter. We also analyze data from dense monitoring of the source with Swift and find an optical photometric period of 63.9±0.5d and an X-ray flux period of 66.8±0.4d. The optical period is consistent with the orbital period, while the X-ray flux period is significantly longer. We discuss possible reasons for this discrepancy, which could be due to a super-orbital period caused by a precessing accretion disk or an orbital resonance. We put the orbital period of P13 into context with the orbital periods implied for two other ultra-luminous pulsars, M82 X-2 and NGC 5907 ULX, and discuss possible implications for the system parameters.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: neutron - X-rays: binaries - techniques: radial velocities - accretion - accretion disks - pulsars: individual: NGC 7793 P13

CDS comments: Paragraph.1 M51 ULX 8 could be [TIW2006] ULX 8 or [LB2005] NGC 5194 X8.

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 - 2019
#notes
1 NAME NGC 300 2010da s*b 00 55 04.86 -37 41 43.7           LBV 74 0
2 V* SU UMa DN* 08 12 28.2694633475 +62 36 22.428029272           B2 462 0
3 [KCF2005] M82 G ULX 09 55 51.040 +69 40 45.49           ~ 142 1
4 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3665 4
5 RX J133006+47156 UX? 13 30 06.00 +47 15 42.3           ~ 19 0
6 RX J133007+47110 UX? 13 30 07.55 +47 11 06.1   25.17 25.49   26.04 ~ 36 1
7 [SST2011] J151558.60+561810.0 ULX 15 15 58.60 +56 18 10.0           ~ 70 0
8 NGC 7793 GiG 23 57 49.7533807411 -32 35 27.708304655 10.26 9.74 9.28 9.06 9.7 ~ 886 2
9 NAME NGC 7793 X-1 X 23 57 50.90 -32 37 26.6           ~ 91 0

    Equat.    Gal    SGal    Ecl

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2019.08.21-06:23:38

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