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Titolo: Ultracompact X-ray binaries with neon-rich degenerate donors
Autore: Juett, AM; Psaltis, D; Chakrabarty, D;
- Indirizzi:
- MIT, Dept Phys, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139MIT, Dept Phys, Cambridge, MA 02139 USA MIT, Space Res Ctr, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139MIT, Space Res Ctr, Cambridge, MA 02139 USA
- Titolo Testata:
- ASTROPHYSICAL JOURNAL
fascicolo: 1,
volume: 560,
anno: 2001,
parte:, 2
pagine: L59 - L63
- SICI:
- 0004-637X(20011010)560:1<L59:UXBWND>2.0.ZU;2-6
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- LINE EMISSION; SPECTROSCOPY; ABSORPTION; 4U-1626-67; EVOLUTION; BURSTS;
- Keywords:
- binaries : close; stars : individual (2S 0918-549, 4U 0614+091, 4U 1543-624, 4U 1850-087); X-rays : binaries;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 37
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Juett, AM MIT, Dept Phys, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139 , Dept Phys, Cambridge, MA 02139 USA
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- Citazione:
- A.M. Juett et al., "Ultracompact X-ray binaries with neon-rich degenerate donors", ASTROPHYS J, 560(1), 2001, pp. L59-L63
Abstract
There are three low-mass X-ray binaries (4U 0614+091, 2S 0918-549, and 4U 1543-624) for which broadline emission near 0.7 keV was previously reported. A recent high-resolution observation of 4U 0614+091 with the Chandra Low-Energy Transmission Grating Spectrometer (LETGS) found evidence of an unusually high Ne/O abundance ratio along the line of sight but failed to detectthe previously reported 0.7 keV feature. We have made a search of archivalASCA spectra and identified a fourth source with the 0.7 keV feature, the 20 minute ultracompact binary 4U 1850-087. In all four of these sources, the 0.7 keV residual is eliminated from the ASCA spectra by allowing excess photoelectric absorption due to a nonsolar relative abundance of neon, just as in the LETGS spectrum of 4U 0614+091. The optical properties of these systems suggest that all four are ultracompact (P-orb < minutes) binaries. Wepropose that there is excess neon local to each of these sources, as also found in the ultracompact binary pulsar 4U 1626-67. We suggest that the mass donor in these systems is a low-mass, neon-rich degenerate dwarf and thatthe binaries are all ultracompact.
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Documento generato il 23/05/13 alle ore 13:48:50