Details

Autor(en) / Beteiligte

• Ahmed, S.
• Bennett, D. W.
• Bennett, J. V.
• Berger, N.
• Boger, E.
• Boyko, I.
• Cao, G. F.
• Chai, J.
• Chen, Y. B.
• Deng, Z. Y.
• Denig, A.
• Denysenko, I.
• Fang, S. S.
• Fang, Y.
• Feldbauer, F.
• Fioravanti, E.
• Gong, W. X.
• Gradl, W.
• Gu, M. H.
• Gu, S.
• Guo, R. P.
• Hao, X. Q.
• He, K. L.
• Heng, Y. K.
• Holtmann, T.
• Hu, C.
• Ikegami Andersson, W.
• Ji, Q. P.
• Ji, X. B.
• Jiang, X. S.
• Johansson, T.
• Julin, A.
• Kang, X. L.
• Khan, T.
• Koch, L.
• Kühn, W.
• Lara, M.
• Li, H. J.
• Li, K.
• Li, P. L.
• Li, Z. B.
• Liang, Y. F.
• Lin, D. X.
• Liu, C. X.
• Liu, F. H.
• Liu, Feng
• Liu, H. B.
• Liu, J. B.
• Liu, P. L.
• Liu, Y. Y.
• Lou, X. C.
• Lu, J. G.
• Lu, Y. P.
• Luo, X. L.
• Ma, H. L.
• Ma, T.
• Ma, X. Y.
• Maas, F. E.
• Maggiora, M.
• Mezzadri, G.
• Min, T. J.
• Mitchell, R. E.
• Olsen, S. L.
• Ouyang, Q.
• Patteri, P.
• Pelizaeus, M.
• Pettersson, J.
• Qi, H. R.
• Qian, S.
• Qin, N.
• Shan, W.
• Spataro, S.
• Sun, X. H.
• Tapan, I.
• Wang, Y. Q.
• Wang, Z. G.
• Xiong, X. A.
• Yang, H. J.
• Yin, J. H.
• Yu, J. S.
• Yuan, Y.
• Zafar, A. A.
• Zeng, Y.
• Zhang, B. X.
• Zhang, B. Y.
• Zhang, H. Y.
• Zhang, J. Q.
• Zhang, K.
• Zhang, S. Q.
• Zhang, X. Y.
• Zhang, Y.
• Zhang, Y. T.
• Zhang, Z. P.
• Zhao, Lei
• Zheng, B.
• Zheng, J. P.
• Zheng, W. J.
• Zheng, Y. H.
• Zhou, X. R.
• Zhuang, J.

Titel

Measurement of $e^{+}e^{-} \to \pi^{0}\pi^{0}\psi(3686)$ at $\sqrt{s}$ from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure

Ort / Verlag

GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report observations of the hot post-asymptotic giant branch star ZNG 1 in the globular cluster M5 (NGC 5904) with the Far Ultraviolet Spectroscopic Explorer (FUSE). From the resulting spectrum, we derive an effective temperature T_eff = 44300 +/- 300 K, a surface gravity log g = 4.3 +/- 0.1, a rotational velocity v sin i = 170 +/- 20 km/s, and a luminosity log (L/L_sun) = 3.52 +/- 0.04. The atmosphere is helium-rich (Y = 0.93), with enhanced carbon (2.6% by mass), nitrogen (0.51%) and oxygen (0.37%) abundances. The spectrum shows evidence for a wind with terminal velocity near 1000 km/s and an expanding shell of carbon- and nitrogen-rich material around the star. The abundance pattern of ZNG 1 is suggestive of the ``born-again'' scenario, whereby a star on the white-dwarf cooling curve undergoes a very late shell flash and returns to the AGB, but the star's rapid rotation is more easily explained by a previous interaction with a binary companion.