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http://hdl.handle.net/20.500.12386/26486
Title: | IGR J18293-1213 is an eclipsing cataclysmic variable | Authors: | Clavel, M. Tomsick, J. A. Bodaghee, A. Chiu, J. L. Fornasini, F. M. Hong, J. Krivonos, R. PONTI, GABRIELE Rahoui, F. Stern, D. |
Issue Date: | 2016 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 461 | Issue: | 1 | First Page: | 304 | Abstract: | Studying the population of faint hard X-ray sources along the plane of the Galaxy is challenging because of high extinction and crowding, which make the identification of individual sources more difficult. IGR J18293-1213 is part of the population of persistent sources which have been discovered by the INTEGRAL satellite. We report on NuSTAR and Swift/XRT observations of this source, performed on 2015 September 11. We detected three eclipsing intervals in the NuSTAR light curve, allowing us to constrain the duration of these eclipses, ∆ t= 30.8^{+6.3}_{-0.0} min, and the orbital period of the system, T = 6.92 ± 0.01 h. Even though we only report an upper limit on the amplitude of a putative spin modulation, the orbital period and the hard thermal bremsstrahlung spectrum of IGR J18293-1213 provide strong evidence that this source is a magnetic cataclysmic variable. Our NuSTAR and Swift/XRT joint spectral analysis places strong constraints on the white dwarf mass M_wd = 0.78^{+0.10}_{-0.09} M<SUB>☉</SUB>. Assuming that the mass to radius ratio of the companion star M<SUB>⋆</SUB>/R<SUB>⋆</SUB> = 1 (solar units) and using T, ∆t, and M<SUB>wd</SUB>, we derived the mass of the companion star M<SUB>⋆</SUB> = 0.82 ± 0.01 M<SUB>☉</SUB>, the orbital separation of the binary system a = 2.14 ± 0.04 R<SUB>☉</SUB>, and its orbital inclination compared to the line of sight I=(72.2°^{+2.4}_{-0.0})± 1.0°. | URI: | http://hdl.handle.net/20.500.12386/26486 | URL: | https://academic.oup.com/mnras/article/461/1/304/2595291 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw1330 | Bibcode ADS: | 2016MNRAS.461..304C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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stw1330Clavel.pdf | PDF editoriale | 1.28 MB | Adobe PDF | View/Open |
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