Euclid：47 Tuc的对流转变间隙
太阳与恒星天体物理
2026-06-26 v1 星系天体物理
摘要
我们报告了借助Euclid数据首次探测到球状星团47 Tuc（NGC 104）中的“对流转变间隙”（也称为“M矮星间隙”）。这一特征与晚型矮星物理性质的变化有关，一直难以捉摸，迄今仅有两例探测。利用Euclid提供的大量恒星、高分辨率和测光精度，我们在47 Tuc的主序光度函数中检测到处统计显著的尖锐不连续性，我们将其识别为对流转变间隙。我们将47 Tuc中该间隙的观测特性与理论模型进行比较，展示了该间隙如何成为探测球状星团内部化学结构及其多重恒星族的强大诊断工具。继最初在贫金属星团NGC 6397中发现之后，在富金属的47 Tuc中识别出对流间隙表明，这一特征可能比以前认为的更为普遍。这些结果表明，Euclid的变革性影响远不止于宇宙学，其影响遍及天体物理学的多个领域，包括分辨恒星族。
引用
@article{arxiv.2606.28504,
title = {Euclid: The convective-transition gap of 47 Tuc},
author = {M. Libralato and M. Griggio and R. Gerasimov and L. R. Bedin and I. McDonald and B. Altieri and J. Anderson and F. Annibali and E. Balbinot and G. Battaglia and A. Bellini and P. Casenove and J. -C. Cuillandre and E. Dalessandro and A. M. N. Ferguson and H. R. A. Jones and K. Kuijken and F. Z. Majidi and D. Massari and A. Mohandasan and F. Niederhofer and G. Polenta and J. D. Sakowska and F. Soldano and C. Zerbinati and S. Andreon and N. Auricchio and H. Aussel and C. Baccigalupi and M. Baldi and A. Balestra and P. Battaglia and A. Biviano and E. Branchini and M. Brescia and S. Camera and V. Capobianco and C. Carbone and J. Carretero and M. Castellano and G. Castignani and S. Cavuoti and K. C. Chambers and A. Cimatti and C. Colodro-Conde and G. Congedo and C. J. Conselice and L. Conversi and Y. Copin and F. Courbin and H. M. Courtois and M. Cropper and H. Degaudenzi and G. De Lucia and H. Dole and F. Dubath and X. Dupac and M. Farina and R. Farinelli and F. Faustini and S. Ferriol and M. Frailis and E. Franceschi and S. Galeotta and K. George and B. Gillis and C. Giocoli and J. Gracia-Carpio and A. Grazian and F. Grupp and S. V. H. Haugan and H. Hoekstra and W. Holmes and I. M. Hook and F. Hormuth and A. Hornstrup and K. Jahnke and M. Jhabvala and S. Kermiche and A. Kiessling and B. Kubik and M. Kümmel and M. Kunz and H. Kurki-Suonio and A. M. C. Le Brun and S. Ligori and P. B. Lilje and V. Lindholm and I. Lloro and O. Mansutti and O. Marggraf and M. Martinelli and N. Martinet and F. Marulli and R. J. Massey and E. Medinaceli and S. Mei and M. Meneghetti and E. Merlin and G. Meylan and A. Mora and L. Moscardini and R. Nakajima and R. C. Nichol and S. -M. Niemi and C. Padilla and S. Paltani and F. Pasian and W. J. Percival and V. Pettorino and M. Poncet and L. A. Popa and F. Raison and A. Renzi and J. Rhodes and G. Riccio and F. Rizzo and E. Romelli and M. Roncarelli and R. Saglia and Z. Sakr and D. Sapone and M. Schirmer and P. Schneider and T. Schrabback and A. Secroun and E. Sihvola and P. Simon and C. Sirignano and G. Sirri and L. Stanco and P. Tallada-Crespí and A. N. Taylor and I. Tereno and S. Toft and R. Toledo-Moreo and F. Torradeflot and I. Tutusaus and J. Valiviita and T. Vassallo and Y. Wang and J. Weller and D. Scott},
journal= {arXiv preprint arXiv:2606.28504},
year = {2026}
}
备注
12 pages, 10 figures. Accepted for publication in A&A on 25 June 2026, first submission to A&A on 2 June 2026. Official Euclid data available at the CDS upon publication