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The origin of galactic metal-rich stellar halo components with highly eccentric orbits
Springel, Volker; Grand, Robert J. J.; Gómez, Facundo A. +6 more
Using the astrometry from the ESA's Gaia mission, previous works have shown that the Milky Way stellar halo is dominated by metal-rich stars on highly eccentric orbits. To shed light on the nature of this prominent halo component, we have analysed 28 Galaxy analogues in the Auriga suite of cosmological hydrodynamics zoom-in simulations. Some three…
A Temporary Epoch of Stalled Spin-down for Low-mass Stars: Insights from NGC 6811 with Gaia and Kepler
Agüeros, Marcel A.; Curtis, Jason Lee; Douglas, Stephanie T. +1 more
Stellar rotation was proposed as a potential age diagnostic that is precise, simple, and applicable to a broad range of low-mass stars (≤slant 1 {M}⊙ ). Unfortunately, rotation period ({P}{{rot}}) measurements of low-mass members of open clusters have undermined the idea that stars spin down with a common age dependence (i.e.…
The GALAH survey: An abundance, age, and kinematic inventory of the solar neighbourhood made with TGAS
Freeman, K. C.; Skúladóttir, Á.; Rix, H. -W. +32 more
The overlap between the spectroscopic Galactic Archaeology with HERMES (GALAH) survey and Gaia provides a high-dimensional chemodynamical space of unprecedented size. We present a first analysis of a subset of this overlap, of 7066 dwarf, turn-off, and sub-giant stars. These stars have spectra from the GALAH survey and high parallax precision from…
YBC: a stellar bolometric corrections database with variable extinction coefficients. Application to PARSEC isochrones
Fu, Xiaoting; Girardi, Léo; Marigo, Paola +7 more
We present the YBC database of stellar bolometric corrections, in which we homogenise widely used theoretical stellar spectral libraries and provide BCs for many popular photometric systems, including Gaia filters. The database can easily be extended to additional photometric systems and stellar spectral libraries. The web interface allows users t…
Black Hole Mass Scaling Relations for Early-type Galaxies. I. M BH-M *, sph and M BH-M *,gal
Graham, Alister W.; Davis, Benjamin L.; Sahu, Nandini
Analyzing a sample of 84 early-type galaxies (ETGs) with directly measured supermassive black hole masses -- nearly doubling the sample size of such galaxies with multicomponent decompositions -- a symmetric linear regression on the reduced (merger-free) sample of 76 galaxies reveals MBH ∝ M*,sph1.27+/-0.07 with a …
Optical Spectroscopy and Demographics of Redback Millisecond Pulsar Binaries
Strader, Jay; Bahramian, Arash; Cheung, C. C. +12 more
We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the context of the 14 confirmed and 10 candidate field…
Piercing the Milky Way: an all-sky view of the Orphan Stream
Li, T. S.; Evans, N. W.; Belokurov, V. +14 more
We use astrometry, broad-band photometry, and variability information from the Data Release 2 of ESA's Gaia mission (GDR2) to identify members of the Orphan Stream (OS) across the whole sky. The stream is traced above and below the celestial equator and in both Galactic hemispheres, thus increasing its visible length to ∼210° equivalent to ∼150 kp…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XIX. A chemical tagging of the multiple stellar populations over the chromosome maps
Anderson, J.; Milone, A. P.; Cordoni, G. +8 more
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters (GCs) has investigated GCs and their stellar populations. In previous papers of this series we have introduced a pseudo two-colour diagram, or `chromosome map' (ChM) that maximizes the separation between the multiple populations. We have identified two main classes of GCs: T…
Homogeneous photometry - VII. Globular clusters in the Gaia era
Pancino, E.; Sanna, N.; Stetson, P. B. +2 more
We present wide-field, ground-based Johnson-Cousins UBVRI photometry for 48 Galactic globular clusters based on about 90 000 public and proprietary images. The photometry is calibrated with the latest transformations obtained in the framework of our secondary standard project, with typical internal and external uncertainties of order a few millima…
Structure and kinematics of the Taurus star-forming region from Gaia-DR2 and VLBI astrometry
Bouy, H.; Covey, K.; Sarro, L. M. +9 more
Aims: We take advantage of the second data release of the Gaia space mission and the state-of-the-art astrometry delivered from very long baseline interferometry observations to revisit the structure and kinematics of the nearby Taurus star-forming region.
Methods: We apply a hierarchical clustering algorithm for partitioning the stars i…