SIMBAD references

2019MNRAS.490.1498L - Mon. Not. R. Astron. Soc., 490, 1498-1508 (2019/December-1)

Detailed study of the Milky Way globular cluster Laevens 3.

LONGEARD N., MARTIN N., IBATA R.A., COLLINS M.L.M., LAEVENS B.P.M., BELL E. and MACKEY D.

Abstract (from CDS):

We present a photometric and spectroscopic study of the Milky Way satellite Laevens 3. Using MegaCam/Canada-France-Hawaii Telescope g and i photometry and Keck II/DEIMOS multi-object spectroscopy, we refine the structural and stellar properties of the system. The Laevens 3 colour-magnitude diagram shows that it is quite metal-poor, old (13.0 ±1.0 Gyr), and at a distance of 61.4 ±1.0 kpc, partly based on two RR Lyrae stars. The system is faint (MV=–2.8+0.2^–0.3 mag) and compact (rh=11.4±_1.0 pc). From the spectroscopy, we constrain the systemic metallicity ( [Fe/H]spectro = -1.8 ±0.1 dex) but the metallicity and velocity dispersions are both unresolved. Using Gaia DR2, we infer a mean proper motion of (µα^*,µ^δ)=(0.51±0.28,–0.83±_0.27) mas yr–1, which, combined with the system's radial velocity (<vr>=–70.2±0.5 km s–1), translates into a halo orbit with a pericenter and apocenter of 40.7 +5.6–14.7 and 85.6+17.2–5.9 kpc, respectively. Overall, Laevens 3 shares the typical properties of the Milky Way's outer halo globular clusters. Furthermore, we find that this system shows signs of mass segregation that strengthens our conclusion that Laevens 3 is a globular cluster.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Local Group

Status at CDS : All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 84

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2021.04.12-06:25:41

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