Siriusly, a newly identified intermediate-age Milky Way stellar cluster: a spectroscopic study of Gaia 1

被引：8
|
作者：
Simpson, J. D. [1 ,2 ,3 ]
De Silva, G. M. [1 ,4 ]
Martell, S. L. [5 ]
Zucker, D. B. [1 ,2 ,3 ]
Ferguson, A. M. N. [6 ]
Bernard, E. J. [7 ]
Irwin, M. [8 ]
Penarrubia, J.
Tolstoy, E. [9 ]
机构：
[1] Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia
[2] Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia
[3] Macquarie Univ, Res Ctr Astron Astrophys & Astrophoton, Sydney, NSW 2109, Australia
[4] Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia
[5] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
[6] Univ Edinburgh, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
[7] Univ Cote Azur, CNRS, OCA, Lagrange, France
[8] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England
[9] Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 471卷 / 04期
基金：
美国国家科学基金会; 澳大利亚研究理事会; 美国国家航空航天局;
关键词：
catalogues; Galaxy: general; Galaxy: structure; PARSEC EVOLUTIONARY TRACKS; MASSIVE STARS; METALLICITIES;
D O I：
10.1093/mnras/stx1892
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We confirm the reality of the recently discovered Milky Way stellar cluster Gaia 1 using spectra acquired with the HERMES and AAOmega spectrographs of the Anglo-Australian Telescope. This cluster had been previously undiscovered due to its close angular proximity to Sirius, the brightest star in the sky at visual wavelengths. Our observations identified 41 cluster members, and yielded an overall metallicity of [Fe/H] = -0.13 +/- 0.13 and barycentric radial velocity of vr = 58.30 +/- 0.22 km s(-1). These kinematics provide a dynamical mass estimate of 12.9(-3.9)(+4.6) x 10(3) M-circle dot. Isochrone fits to Gaia, 2MASS, and Pan-STARRS1 photometry indicate that Gaia 1 is an intermediate age (similar to 3 Gyr) stellar cluster. Combining the spatial and kinematic data we calculate Gaia 1 has a circular orbit with a radius of about 12 kpc, but with a large out of plane motion: z(max) = 1.1(-0.3)(+0.4) kpc. Clusters with such orbits are unlikely to survive long due to the number of plane passages they would experience.
引用
收藏
页码：4087 / 4098
页数：12
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