| タイトル | Detection of an ultraviolet and visible counterpart of the NGC 6624 X-ray burster |
| 著者（英） | Boksenberg, A.; Barbieri, C.; Disney, M. J.; Stanford, S. A.; Deharveng, J. M.; Crane, P.; Blades, J. C.; Jakobsen, P.; King, I. R.; Albrecht, R. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1993-08-20 |
| 言語 | eng |
| 内容記述 | We have detected, in images taken with the HST FOC, the UV and optical counterpart of the X-ray source 4U 1820-30 in the globular cluster NGC 6624. Astrometric measurements place this object 2 sigma from the X-ray position of 4U 1820-30. The source dominates a far-UV FOC image and has the same flux at 1400 A as was seen through the large IUE aperture by Rich et al. (1993). It has a B magnitude of 18.7 but is not detected in V. It is 0.66 arcsec from the center of NGC 6624, a fact that may change the interpretation of the P-average of the 11 minute binary orbit. The flux drops between 1400 and 4300 A at a rate that is nearly as steep as that of a Rayleigh-Jeans curve. The flux is far too large to come from the neutron star directly but could accord with radiation from a heated accretion disk and/or the heated side of the companion star. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 93A55102 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/314071 |
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