On the Binary Nature of 1RXS J162848.1−415241

Torres, M. A. P.; Garcia, M. R.; Steeghs, D.; McClintock, Jeffrey E.

doi:10.1086/432907

Cited by 6 publications

(5 citation statements)

References 60 publications

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“…In active stars line broadening of the Hα profile can be well above the rotational broadening measured in the photospheric lines and reach up to 9 Å (= 400 km s −1 ) FWHM in extremely active objects (see e.g. Walter & Basri 1982, Torres et al 2005. The lack of Helium in emission above the continuum is also a common characteristic of chromospherically active sources.…”

Section: Criteria For the Spectroscopic Identification Of Accreting B...mentioning

confidence: 95%

Identification of 23 accreting binaries in the Galactic Bulge Survey

Torres

Jonker

Britt

et al. 2014

Monthly Notices of the Royal Astronomical Society

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We are undertaking a survey to characterize the X-ray sources found with the Chandra X-ray observatory in a strip of fields at −3 • < l < 3 • , b = +1.5 • and −3 • < l < 3 • , b = −1.5 • . This so-called Galactic Bulge Survey (GBS) targets X-ray emitting binaries in the bulge with the primary purpose of finding quiescent X-ray binaries. The aims of this survey are to quantify dynamically the mass of compact objects in these X-ray binaries in order to constrain the neutron star equation of state and to test black hole formation models. In addition, using the survey number counts of various sources we aim to test models for binary formation and evolution. Here, we present the identification of optical counterparts to twenty-three GBS X-ray sources. We report their accurate coordinates and medium resolution optical spectra acquired at the Very Large Telescope and Magellan. All sources are classified as accreting binaries according to their emission line characteristics. To distinguish accreting binaries from chromospherically active objects we develop and explain criteria based on Hα and Hei λλ5786, 6678 emission line properties available in the literature. The spectroscopic properties and photometric variability of all the objects are discussed and a classification of the source is given where possible. Among the twenty-three systems, at least nine of them show an accretion-dominated optical spectrum (CX28, CX63, CX70, CX128, CX142, CX207, CX522, CX794 CX1011) and another six show photospheric lines from a late-type donor star in addition to accretion disc emission (CX44, CX93, CX137, CX154, CX377 and CX1004) indicating that they are probably accreting binaries in quiescence or in a low accretion rate state. Two sources are confirmed to be eclipsing: CX207 and CX794. CX207 shows a broad asymmetric Hα profile blue-shifted by > 300 km s −1 . Such line profile characteristics are consistent with a magnetic (Polar) cataclysmic variable. CX794 is an eclipsing nova-like cataclysmic variable in the period gap. Time-resolved photometry and the large broadening of the Hα emission lines in CX446 (2100 km s −1 Full-Width at Half Maximum; FWHM) suggest that this is also an eclipsing or high-inclination accreting binary. Finally, the low-accretion rate source CX1004 shows a double-peaked Hα profile with a FWHM of 2100 km s −1 . This supports a high inclination or even eclipsing system. Whether the compact object is a white dwarf in an eclipsing cataclysmic variable or a black hole primary in a high-inclination low-mass X-ray binary remains to be established.

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Section: Criteria For the Spectroscopic Identification Of Accreting B...mentioning

confidence: 95%

Identification of 23 accreting binaries in the Galactic Bulge Survey

Torres

Jonker

Britt

et al. 2014

Monthly Notices of the Royal Astronomical Society

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“…′′ 6 (Krauss et al 2006). The absence of an optical/IR counterpart sets an upper limit on distance of 12 kpc (Torres et al 2006). The absence of PRE bursts sets a more stringent upper limit of 10.6 kpc (Kaaret et al 2007).…”

Section: Xte J1739-285 (ν B = 1122 Hz)*mentioning

confidence: 98%

Detecting gravitational wave emission from the known accreting neutron stars

Watts

Krishnan

Bildsten³

et al. 2008

Monthly Notices of the Royal Astronomical Society

203

286

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Detection of gravitational waves from accreting neutron stars (NSs) in our galaxy, due to ellipticity or internal oscillation, would be a breakthrough in our understanding of compact objects and explain the absence of NSs rotating near the break-up limit. Direct detection, however, poses a formidable challenge. Using the current data available on the properties of the accreting NSs in Low Mass X-Ray Binaries (LMXBs), we quantify the detectability for the known accreting NSs, considering various emission scenarios and taking into account the negative impact of parameter uncertainty on the data analysis process. Only a few of the persistently bright NSs accreting at rates near the Eddington limit are detectable by Advanced LIGO if they are emitting gravitational waves at a rate matching the torque from accretion. A larger fraction of the known population is detectable if the spin and orbital parameters are known in advance, especially with the narrow-band Advanced LIGO. We identify the most promising targets, and list specific actions that would lead to significant improvements in detection probability. These include astronomical observations (especially for unknown orbital periods), improvements in data analysis algorithms and capabilities, and further detector development

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“…As is customary in this series of papers, we now update the broad statistical approach used in Papers V and VI by including the results presented here, along with recent spectroscopic optical and NIR identifications of INTEGRAL sources as HMXBs (Chaty et al 2008, but see Nespoli et al 2008b;Nespoli et al 2008a,c), LMXBs (Torres et al 2006;Cadolle Bel et al 2007;Nespoli et al 2008b;Torres et al 2008) and AGNs (Bikmaev et al 2008a;Gonçalves et al 2008).…”

Section: Statistical Considerationsmentioning

confidence: 99%

Unveiling the nature of INTEGRAL objects through optical spectroscopy. VII. Identification of 20 Galactic and extragalactic hard X-ray sources

Masetti,

Parisi,

Palazzi

et al. 2008

Preprint

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Within the framework of our program of assessment of the nature of unidentified or poorly known INTEGRAL sources, we present here spectroscopy of optical objects, selected through positional cross-correlation with soft X-ray detections (afforded with satellites such as Swift, ROSAT, Chandra and/or XMM-Newton) as putative counterparts of hard X-ray sources detected with the IBIS instrument onboard INTEGRAL. Using 6 telescopes of various sizes and archival data from two on-line spectroscopic surveys we are able to identify, either for the first time or independent of other groups, the nature of 20 INTEGRAL hard X-ray sources. Our results indicate that: 11 of these objects are active galactic nuclei (AGNs) at redshifts between 0.014 and 0.978, 7 of which display broad emission lines, 2 show narrow emission lines only, and 2 have unremarkable or no emission lines (thus are likely Compton thick AGNs); 5 are cataclysmic variables (CVs), 4 of which are (possibly magnetic) dwarf novae and one is a symbiotic star; and 4 are Galactic X-ray binaries (3 with high-mass companions and one with a low-mass secondary). It is thus again found that the majority of these sources are AGNs or magnetic CVs, confirming our previous findings. When possible, the main physical parameters for these hard X-ray sources are also computed using the multiwavelength information available in the literature. These identifications support the importance of INTEGRAL in the study of the hard X-ray spectrum of all classes of X-ray emitting objects, and the effectiveness of a strategy of multi-catalogue cross-correlation plus optical spectroscopy to securely pinpoint the actual nature of unidentified hard X-ray sources.

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On the Binary Nature of 1RXS J162848.1−415241

Cited by 6 publications

References 60 publications

Identification of 23 accreting binaries in the Galactic Bulge Survey

Identification of 23 accreting binaries in the Galactic Bulge Survey

Detecting gravitational wave emission from the known accreting neutron stars

Unveiling the nature of INTEGRAL objects through optical spectroscopy. VII. Identification of 20 Galactic and extragalactic hard X-ray sources

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