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Title:
A Multiwavelength Study of 1WGA J1346.5-6255: A New γ Cas Analog Unrelated to the Background Supernova Remnant G309.2-00.6
Authors:
Safi-Harb, Samar; Ribó, Marc; Butt, Yousaf; Matheson, Heather; Negueruela, Ignacio; Lu, Fangjun; Jia, Shumei; Chen, Yong
Affiliation:
AA(Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada; .; Department of Physics, George Washington University, Washington, DC 20052.), AB(Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Barcelona 08028, Spain.; AIM-Astrophysique Interactions Multiéchelles (UMR 7158 CEA/CNRS/Université Paris 7 Denis Diderot), CEA Saclay, DSM/DAPNIA/Service d'Astrophysique, Gif-sur-Yvette, Cedex 91191, France.), AC(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138.), AD(Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada; .), AE(Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Escuela Politécnica Superior, Universitat d'Alacant, Alicante 03080, Spain.), AF(Key Laboratory of Particle Astrophysics, Istitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.), AG(Key Laboratory of Particle Astrophysics, Istitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.), AH(Key Laboratory of Particle Astrophysics, Istitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.)
Publication:
The Astrophysical Journal, Volume 659, Issue 1, pp. 407-418. (ApJ Homepage)
Publication Date:
04/2007
Origin:
UCP
ApJ Keywords:
ISM: Abundances, ISM: individual (G309.2-00.6), open clusters and associations: individual (NGC 5281), Stars: Emission-Line, Be, stars: individual (HD 119682), X-rays: individual (1RXS J134633.6-625528), X-rays: individual (1WGA J1346.5-6255), X-rays: individual (SNR G309.2-00.6)
DOI:
10.1086/512055
Bibliographic Code:
2007ApJ...659..407S

Abstract

1WGA J1346.5-6255 is a ROSAT X-ray source found within the radio lobes of the supernova remnant (SNR) G309.2-00.6. It appears to coincide with the bright and early-type star HD 119682, in the galactic open cluster NGC 5281. Its radio morphology, consisting of two brightened and distorted arcs of emission on opposite sides of the 1WGA J1346.5-6255 source and of a jetlike feature and break in the shell, suggest that 1WGA J1346.5-6255/G309.2-00.6 is a young analog of the microquasar powering the W50 nebula SS 433. This motivated us to study this source at X-ray and optical wavelengths. We present new Chandra observations of 1WGA J1346.5-6255, archival XMM-Newton observations of G309.2-00.6, and optical spectroscopic observations of HD 119682, to search for X-ray jets from 1WGA J1346.5-6255, study its association with the SNR, and test for whether HD 119682 represents its optical counterpart. We find no evidence for jets from 1WGA J1346.5-6255 down to an unabsorbed flux of 2.6×10-13 ergs cm-2 s (0.5-7.5 keV), we rule out its association with G309.2-00.6, and we confirm that HD 119682 is its optical counterpart. We derive a distance of 1.2+/-0.3 kpc, consistent with the distance estimate to NGC 5281 (1.3+/-0.3 kpc), and much smaller than the distance derived to G309.2-00.6. We discuss the nature of the source, unveil that HD 119682 is a Be star, and suggest it is a new member of the recently proposed group of γ Cas analogs. The Chandra and XMM-Newton X-ray light curves show variability on timescales of hundreds of seconds, and the presence of a possible period of ~1500 s that could be the rotational period of an accreting neutron star or white dwarf in this γ Cas analog.
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