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http://hdl.handle.net/20.500.12386/24006
Titolo: | Probing the MSP Prenatal Stage: The Optical Identification of the X-Ray Burster EXO 1745-248 in Terzan 5 | Autori: | Ferraro, F. R. Pallanca, C. Lanzoni, B. Cadelano, M. Massari, D. Dalessandro, Emanuele Mucciarelli, A. |
Data pubblicazione: | 2015 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 807 | Fascicolo: | 1 | Da pagina:: | L1 | Abstract: | 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. <P />Based on observations (GO 14061, GO 12933, GO 9799) with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555. | URI: | http://hdl.handle.net/20.500.12386/24006 | URL: | https://iopscience.iop.org/article/10.1088/2041-8205/807/1/L1 | ISSN: | 0004-637X | DOI: | 10.1088/2041-8205/807/1/L1 | Bibcode ADS: | 2015ApJ...807L...1F | Fulltext: | open |
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