B
 eppo
 SAX
 Serendipitous Discovery of the X-Ray Pulsar SAX J1802.7-2017

Augello, Giuseppa; Iaria, R.; Robba, N. R.; Salvo, T. Di; Burderi, L.; Lavagetto, G.; Stella, L.

doi:10.1086/379092

Cited by 35 publications

(43 citation statements)

References 15 publications

(16 reference statements)

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“…These sources were persistent, at least on a time scale of 2 years, but vary by factor 5 to 20 at least. Weak detection of all these sources, excepting IGR J16418−4532, by previous mission (Murakami et al 2003;Rodriguez et al 2003;Sugizaki et al 2001;Warwick et al 1988;Augello et al 2003;Lutovinov et al 2005a) also support their persistent nature. Table 3.…”

Section: Long Term Variabilitysupporting

confidence: 52%

XMM-Newton and INTEGRAL observations of new absorbed supergiant high-mass X-ray binaries

Walter

Heras

Bassani

et al. 2006

A&A

169

227

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Context. During the first year in operation, INTEGRAL, the European Space Agency's γ-ray observatory, has detected more than 28 new bright sources in the galactic plane which emit the bulk of their emission above 10 keV. Aims. To understand the nature of those sources we have obtained follow-up observations in the X-ray band with XMM-Newton. Methods. We derive accurate X-ray positions, propose infrared counterparts and study the source high energy long and short term variability and spectra. Results. 70% of the sources are strongly absorbed (N H ≥ 10 23 atom cm −2 ). More than half of these absorbed sources show pulsations with periods ranging from 139 to 1300 s, i.e., they are slow X-ray pulsars. The candidate infrared counterparts are not as strongly absorbed demonstrating that part of the absorbing matter is local to the sources. Conclusions. Many of these new sources are supergiant high-mass X-ray binaries (HMXB) in which the stellar wind of the companion star is accreted onto the compact object. The large local absorption in these new sources can be understood if the compact objects are buried deep in their stellar winds. These new objects represent half of the population of supergiant HMXB.

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Section: Long Term Variabilitysupporting

confidence: 52%

XMM-Newton and INTEGRAL observations of new absorbed supergiant high-mass X-ray binaries

Walter

Heras

Bassani

et al. 2006

A&A

169

227

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“…IGR J18027-2016 is a persistent eclipsing X-ray pulsar detected by INTEGRAL Lutovinov et al, 2005b) and BeppoSAX (Augello et al, 2003). With a spin period of 139.612 sec and an orbital period of 4.4696 days, its orbit could be reconstructed Mason et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

High-mass X-ray binaries in the Milky Way

Walter

Lutovinov

Bozzo

et al. 2015

Astron Astrophys Rev

228

234

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High-mass X-ray binaries are fundamental in the study of stellar evolution, nucleosynthesis, structure and evolution of galaxies and accretion processes. Hard X-rays observations by INTEGRAL and Swift have broadened significantly our understanding in particular for the super-giant systems in the Milky Way, which number has increased by almost a factor of three. INTEGRAL played a crucial role in the discovery, study and understanding of heavily obscured systems and of fast X-ray transients. Most super-giant systems can now be classified in three categories: classical/obscured, eccentric and fast transient.The classical systems feature low eccentricity and variability factor of ∼ 10 3 , mostly driven by hydrodynamic phenomena occurring on scales larger than the accretion radius. Among them, systems with short orbital periods and close to Roche-Lobe overflow or with slow winds, appear highly obscured. In eccentric systems, the variability amplitude can reach even higher factors, because of the contrast of the wind density along the orbit. Four super-giant systems, featuring fast outbursts, very short orbital periods and anomalously low accretion rates, are not yet understood.Simulations of the accretion processes on relatively large scales have progressed and reproduce parts of the observations. The combined effects of wind

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“…The resulting radial velocities were then corrected to the solar system barycentre and are reported in Table 1. The eccentricity of the system is reported as e 0.2 (Augello et al 2003) and although no precise measurement of the eccentricity is reported, Hill et al (2005) found sinusoidal modulation from an analysis of pulse arrival times that indicates the NS is in a circular orbit around the mass donor. We have thus fitted the radial velocities of the supergiant donor with a sinusoidal solution, using the ephemeris of Hill et al (2005) which specifies the epoch of mid-eclipse as T(MJD) = 52 168.26(4) + 4.5696(9)N (1) the uncertainties in brackets refer to the last decimal place quoted and N is the cycle number.…”

Section: Discussionmentioning

confidence: 99%

The masses of the neutron and donor star in the high-mass X-ray binary IGR J18027-2016

Mason

Norton

Clark

et al. 2011

A&A

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Aims. We report near-infrared observations of the supergiant donor to the eclipsing high mass X-ray binary pulsar IGR J18027-2016. We aim to determine its spectral type and measure its radial velocity curve and hence determine the stellar masses of the components. Methods. ESO/VLT observations of the donor utilising the NIR spectrograph ISAAC were obtained in the H and K bands. The multiepoch H band spectra were cross-correlated with RV templates in order to determine a radial solution for the system. Results. The spectral type of the donor was confirmed as B0-1 I. The radial velocity curve constructed has a semi-amplitude of 23.8 ± 3.1 km s −1 . Combined with other measured system parameters, a dynamically determined neutron star mass of 1.4 ± 0.2-1.6 ± 0.3 M is found. The mass range of the B0-B1 I donor was 18.6 ± 0.8-21.8 ± 2.4 M . These lower and upper limits were obtained under the assumption that the system is viewed edge-on (i = 90 • with β = 0.89) for the lower limit and the donor fills its Roche lobe (β = 1 with i = 73.1 • ) for the upper limit respectively.

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B eppo SAX Serendipitous Discovery of the X-Ray Pulsar SAX J1802.7-2017

Cited by 35 publications

References 15 publications

XMM-Newton and INTEGRAL observations of new absorbed supergiant high-mass X-ray binaries

XMM-Newton and INTEGRAL observations of new absorbed supergiant high-mass X-ray binaries

High-mass X-ray binaries in the Milky Way

The masses of the neutron and donor star in the high-mass X-ray binary IGR J18027-2016

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