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The ATLAS All-Sky Stellar Reference Catalog
Wolf, C.; Smartt, S. J.; Stalder, B. +6 more
The Asteroid Terrestrial-impact Last Alert System (ATLAS) observes most of the sky every night in search of dangerous asteroids. Its data are also used to search for photometric variability, where sensitivity to variability is limited by photometric accuracy. Since each exposure spans 7.°6 corner to corner, variations in atmospheric transparency i…
The Hipparcos-Gaia Catalog of Accelerations
Brandt, Timothy D.
This paper presents a cross-calibrated catalog of Hipparcos and Gaia astrometry to enable their use in measuring changes in proper motion, i.e., accelerations in the plane of the sky. The final catalog adopts the reference frame of the second Gaia data release (DR2) and locally cross-calibrates both the scaled Hipparcos-Gaia DR2 positional differe…
The kinematics of the Scorpius-Centaurus OB association from Gaia DR1
Wright, Nicholas J.; Mamajek, Eric E.
We present a kinematic study of the Scorpius-Centaurus (Sco-Cen) OB association (Sco OB2) using Gaia DR1 parallaxes and proper motions. Our goal is to test the classical theory that OB associations are the expanded remnants of dense and compact star clusters disrupted by processes such as residual gas expulsion. Gaia astrometry is available for 25…
The bright-star masks for the HSC-SSP survey
Oguri, Masamune; Medezinski, Elinor; Bosch, James +4 more
We present the procedure to build and validate the bright-star masks for the Hyper-Suprime-Cam Strategic Subaru Proposal (HSC-SSP) survey. To identify and mask the saturated stars in the full HSC-SSP footprint, we rely on the Gaia and Tycho-2 star catalogues. We first assemble a pure star catalogue down to GGaia < 18 after removing ∼…
Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation
Choi, Jieun; Conroy, Charlie; Dotter, Aaron +4 more
The Hyades, Praesepe, and Pleiades are well-studied stellar clusters that anchor important secondary stellar age indicators. Recent studies have shown that main sequence turn off based ages for these clusters may depend on the degree of rotation in the underlying stellar models. Rotation induces structural instabilities that can enhance the chemic…
The magnetic early B-type stars I: magnetometry and rotation
Wade, G. A.; Neiner, C.; Shultz, M. E. +7 more
The rotational and magnetic properties of many magnetic hot stars are poorly characterized, therefore the Magnetism in Massive Stars and Binarity and Magnetic Interactions in various classes of Stars collaborations have collected extensive high-dispersion spectropolarimetric data sets of these targets. We present longitudinal magnetic field measur…
The mass of the young planet Beta Pictoris b through the astrometric motion of its host star
Snellen, I. A. G.; Brown, A. G. A.
The young massive Jupiters discovered with high-contrast imaging1-4 provide a unique opportunity to study the formation and early evolution of gas giant planets. A key question is to what extent gravitational energy from accreted gas contributes to the internal energy of a newly formed planet. This has led to a range of formation scenar…
The Cepheid period-luminosity-metallicity relation based on Gaia DR2 data
Groenewegen, M. A. T.
Aims: We use parallax data from the Gaia second data release (GDR2), combined with parallax data based on HIPPARCOS and HST data, to derive the period-luminosity-metallicity (PLZ) relation for Galactic classical cepheids (CCs) in the V, K, and Wesenheit WVK bands.
Methods: An initial sample of 452 CCs are extracted from the literature wi…
Empirical photometric calibration of the Gaia red clump: Colours, effective temperature, and absolute magnitude
Arenou, F.; Babusiaux, C.; Turon, C. +2 more
Context. Gaia Data Release 1 allows the recalibration of standard candles such as the red clump stars. To use those stars, they first need to be accurately characterised. In particular, colours are needed to derive interstellar extinction. As no filter is available for the first Gaia data release and to avoid the atmosphere model mismatch, an empi…
Age-resolved chemistry of red giants in the solar neighbourhood
Bovy, Jo; Majewski, Steven R.; Feuillet, Diane K. +7 more
In the age of high-resolution spectroscopic stellar surveys of the Milky Way, the number of stars with detailed abundances of multiple elements is rapidly increasing. These elemental abundances are directly influenced by the evolutionary history of the Galaxy, but this can be difficult to interpret without an absolute timeline of the abundance enr…