PROBING THE MSP PRENATAL STAGE: THE OPTICAL IDENTIFICATION OF THE X-RAY BURSTER EXO 1745-248 IN TERZAN 5
We report on the optical identification of the neutron star burster EXO 1745-248 in Terzan 5. The identification was performed by exploiting Hubble Space Telescope/Advanced Camera for Surveys images acquired in Director's Discretionary Time shortly after (approximately one month) the Swift dete...
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| Veröffentlicht in: | Astrophysical journal. Letters 2015-07, Vol.807 (1), p.1-5 |
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| creator | Ferraro, F R Pallanca, C Lanzoni, B Cadelano, M Massari, D Dalessandro, E Mucciarelli, A |
| description | We report on the optical identification of the neutron star burster EXO 1745-248 in Terzan 5. The identification was performed by exploiting Hubble Space Telescope/Advanced Camera for Surveys images acquired in Director's Discretionary Time shortly after (approximately one month) the Swift detection of the X-ray burst. The comparison between these images and previous archival data revealed the presence of a star that is currently brightened by ~3 mag, consistent with expectations during an X-ray outburst. The centroid of this object well agrees with the position, in the archival images, of a star located in the turn-off/sub-giant-branch region of Terzan 5. This supports the scenario that the companion should have recently filled its Roche Lobe. Such a system represents the prenatal stage of a millisecond pulsar, an evolutionary phase during which heavy mass accretion on the compact object occurs, thus producing X-ray outbursts and re-accelerating the neutron star. |
| doi_str_mv | 10.1088/2041-8205/807/1/L1 |
| format | Article |
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Letters</title><description>We report on the optical identification of the neutron star burster EXO 1745-248 in Terzan 5. The identification was performed by exploiting Hubble Space Telescope/Advanced Camera for Surveys images acquired in Director's Discretionary Time shortly after (approximately one month) the Swift detection of the X-ray burst. The comparison between these images and previous archival data revealed the presence of a star that is currently brightened by ~3 mag, consistent with expectations during an X-ray outburst. The centroid of this object well agrees with the position, in the archival images, of a star located in the turn-off/sub-giant-branch region of Terzan 5. This supports the scenario that the companion should have recently filled its Roche Lobe. 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| subjects | APPROXIMATIONS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Bursting CAMERAS Centroids COMPARATIVE EVALUATIONS Hubble Space Telescope Image detection MASS NEUTRON STARS Outbursts PROBES PULSARS ROCHE EQUIPOTENTIALS SPACE STAR EVOLUTION TELESCOPES X RADIATION X-rays |
| title | PROBING THE MSP PRENATAL STAGE: THE OPTICAL IDENTIFICATION OF THE X-RAY BURSTER EXO 1745-248 IN TERZAN 5 |
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