{"id":54232,"date":"2020-08-26T16:10:00","date_gmt":"2020-08-26T13:10:00","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/astrosat-observations-detect-thermonuclear-x-ray-bursts-on-cygnus-x-2\/"},"modified":"2020-08-26T16:10:00","modified_gmt":"2020-08-26T13:10:00","slug":"astrosat-observations-detect-thermonuclear-x-ray-bursts-on-cygnus-x-2","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/astrosat-observations-detect-thermonuclear-x-ray-bursts-on-cygnus-x-2\/","title":{"rendered":"#AstroSat observations detect thermonuclear X-ray bursts on Cygnus X-2"},"content":{"rendered":"

“#AstroSat observations detect thermonuclear X-ray bursts on Cygnus X-2<\/strong>”<\/p>\n

\n
\n
\n
\"AstroSat<\/img>
\n The raw light curve of Cyg X-2. Credit: Devasia et al., 2020.
\n <\/figcaption><\/figure>\n<\/div>\n<\/div>\n

Using the AstroSat spacecraft, Indian astronomers have identified thermonuclear X-ray bursts on the low-mass X-ray binary (LMXB) Cygnus X-2. The finding, reported in a paper published August 17 on the arXiv preprint server, could shed more light on the nature of this source.<\/p>\n

\n <\/section>\n

X-ray binaries consist of a normal star or a white dwarf transferring mass onto a compact neutron star or a black hole. Based on the mass of the companion star, astronomers divide them into low-mass X-ray binaries (LMXB) and high-mass X-ray binaries (HMXB).<\/p>\n

LMXBs may exhibit transient outbursts, during which an increase in X-ray luminosities is observed. Some of these outbursts are characterized as type I X-ray bursts\u2014thermonuclear explosions taking place on the surface layers of neutron stars.
\nDiscovered in 1965, Cygnus X-2 (Cyg X-2 for short) is a neutron star LMXB with an orbital period of about 9.84 days. The mass of the neutron star is app<\/a>roximately 1.71 solar masses, while the mass of its companion, an evolved late-type star, is estimated to be between 0.4 and 0.7 solar masses.
\nSince the detection of Cyg X-2, a number of type I X-ray bursts, burst-like events and quasi-periodic oscillations (QPOs) have been observed from this source. Now, a team of astronomers led by Jincy Devasia of the Henry Baker College in Melukavu, India, reports the discovery of five new type I X-ray bursts and one burst-like event in Cyg X-2. The finding was made with the Large Area X-ray Proportional Counter (LAXPC) instrument onboard the AstroSat satellite.
\n“In this work, we present the results of timing and spectral analysis of AstroSat\/LAXPC observations of Cyg X-2 carried out in 2016 and report the detection of five type I thermonuclear X-ray bursts and one burst-like event,” the astronomers wrote in the paper.
\nThe LAXPC instrument detected the presence of a total of six X-ray-burst-like peaks. The bursts, designated B1 to B6, are general<\/a>ly weak, lasting between four and six seconds.
\nThe events have burst peak-to-persistent intensity ratios below 3.0, decay times of about 1-1.5 seconds, and fluences of around 0.01 milliergs\/cm2<\/sup>. All of the bursts exhibit a blackbody temperature in the range 1-2 keV while their radii are between 5 and 18 km. B5 was found to exhibit a substructure with two peaks, which distinguishes it from the other five bursts that were classified as type I X-ray bursts.
\nAccording to the paper, the properties of B5 are similar to those of the burst-like events previously reported on Cyg X-2, while the characteristics of the remaining five events are consistent with typical thermonuclear X-ray explosions identified by other studies. The results suggest that the newly detected bursts are helium-fuelled flashes.
\nThe astronomers concluded that all in all, Cyg X-2 was entering the early flaring branch (FB) during the AstroSat observations in 2016.
\n“Using results from our analysis we infer that during this observation in 2016, Cyg X-2 can be characterized as being in the early FB with a puffed up accretion disk and a clumpy coronal structure while undergoing medium-to-high levels of accretion,” the authors of the paper wrote.<\/p>\n

\n<\/hr>\n
\n<\/hr>\n

More information:<\/strong>
\n Thermonuclear X-ray bursts detected in Cyg X-2 using AstroSat\/LAXPC, arXiv:2008.07172 [astro-ph.HE] arxiv.org\/abs\/2008.07172<\/p>\n

\u00a9 2020 Science<\/a> X Network<\/p>\n

\n Citation<\/strong>:
\n AstroSat observations detect thermonuclear X-ray bursts on Cygnus X-2 (2020, August 26)
\n retrieved 26 August 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-08-astrosat-thermonuclear-x-ray-cygnus-x-.html<\/p>\n

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“#AstroSat observations detect thermonuclear X-ray bursts on Cygnus X-2” The raw light curve of Cyg X-2. Credit: Devasia et al., 2020. Using the AstroSat spacecraft, Indian astronomers have identified thermonuclear X-ray bursts on the low-mass X-ray binary (LMXB) Cygnus X-2. The finding, reported in a paper published August 17 on the arXiv preprint server, could…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[16],"tags":[5017,59063],"class_list":["post-54232","post","type-post","status-publish","format-standard","hentry","category-sciencee","tag-astronomy","tag-astrosat-observations-detect-thermonuclear-x-ray-bursts-on-cygnus-x-2"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/54232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=54232"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/54232\/revisions"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=54232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=54232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=54232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}