2018A&A...616A..36M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.19CEST05:06:11

2018A&A...616A..36M - Astronomy and Astrophysics, volume 616A, 36-36 (2018/8-1)

EXTraS discovery of a peculiar flaring X-ray source in the Galactic globular cluster NGC 6540.

MEREGHETTI S., DE LUCA A., SALVETTI D., BELFIORE A., MARELLI M., PAIZIS A., RIGOSELLI M., SALVATERRA R., SIDOLI L. and TIENGO A.

Abstract (from CDS):

We report the discovery of a flaring X-ray source 7'' from the center of the globular cluster NGC 6540 obtained during the EXTraS project devoted to a systematic search for variability in archival data of the XMM-Newton satellite. The source had a quiescent X-ray luminosity on the order of ∼1032erg/s in the 0.5-10keV range (for a distance of NGC 6540 of 4kpc) and showed a flare lasting about 300s. During the flare, the X-ray luminosity increased by more than a factor 40, with a total emitted energy of ∼1036erg. These properties, as well as Hubble Space Telescope photometry of the possible optical counterparts, suggest the identification with a chromospherically active binary in the cluster. However, the flare luminosity is significantly higher than what is commonly observed in stellar flares of such a short duration, leaving open the possibility of other interpretations.

Abstract Copyright: © ESO 2018

Journal keyword(s): globular clusters: individual: NGC 6540 - stars: flare - X-rays: binaries - X-rays: bursts

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3463 0
2 V* RS CVn Al* 13 10 36.9078781154 +35 56 05.587686902 8.57 8.51 7.93 7.7   F6IV+G8IV 677 0
3 NGC 6540 GlC 18 06 08.60 -27 45 55.0           ~ 82 0
4 3XMM J180608.9-274553 X 18 06 08.94 -27 45 53.5           ~ 1 0
5 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 637 0
6 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1763 0
7 NAME Galactic Bulge reg ~ ~           ~ 3233 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2018A&A...616A..36M and select 'bookmark this link' or equivalent in the popup menu


2019.10.19-05:06:11

© Université de Strasbourg/CNRS

    • Contact