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Constraining Mass-transfer Histories of Blue Straggler Stars with COS Spectroscopy of White Dwarf Companions
Sills, Alison; Knigge, Christian; Mathieu, Robert D. +4 more
Recent studies show that the majority of blue straggler stars (BSSs) in old open clusters are formed through mass transfer from an evolved star onto a main-sequence companion, resulting in a BSS and white dwarf (WD) in a binary system. We present constraints on the mass transfer histories of two BSS-WD binaries in the open cluster NGC 188, using W…
Rotating Halo Traced by the K-giant Stars from LAMOST and Gaia
Tian, Hao; Xu, Yan; Liu, Chao +1 more
With the help of Gaia DR2, we are able to obtain the full 6D phase space information for stars from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope DR5. With high precision of the position, velocity, and metallicity, the rotation of the local stellar halo is presented using the K-giant stars with [Fe/H] < -1 dex within 4 kpc from …
L1495 revisited: a PPMAP view of a star-forming filament
Griffin, M. J.; Smith, M. W. L.; Marsh, K. A. +4 more
We have analysed the Herschel and SCUBA-2 dust continuum observations of the main filament in the Taurus L1495 star-forming region, using the Bayesian fitting procedure PPMAP. (i) If we construct an average profile along the whole length of the filament, it has FWHM ∼eq 0.087± 0.003 pc; but the closeness to previous estimates is coincidental. (ii)…
Ripple Patterns in In-plane Velocities of OB Stars from LAMOST and Gaia
Cheng, Xinlun; Mao, Shude; Liu, Chao +1 more
With about 12,000 OB type stars selected from the LAMOST and Gaia survey, we study their three-dimensional velocity distribution over the range of galactocentric radius from 6 to 15 kpc in the Galactic disk plane. A clear ripple pattern in the radial velocity (V R ) map is shown. The median V R reaches -8 km s-1…
Through thick or thin: multiple components of the magneto-ionic medium towards the nearby H II region Sharpless 2-27 revealed by Faraday tomography
Federrath, Christoph; Gaensler, B. M.; McClure-Griffiths, N. M. +12 more
Sharpless 2-27 (Sh2-27) is a nearby H II region excited by ζOph. We present observations of polarized radio emission from 300 to 480 MHz towards Sh2-27, made with the Parkes 64 m Radio Telescope as part of the Global Magneto-Ionic Medium Survey. These observations have an angular resolution of 1.35°, and the data are uniquely sensitive to magneto-…
Galaxy cluster mergers as triggers for the formation of jellyfish galaxies: case study of the A901/2 system
Chies-Santos, Ana L.; Lima Neto, Gastão B.; Roman-Oliveira, Fernanda V. +4 more
The A901/2 system is a rare case of galaxy cluster interaction, in which two galaxy clusters and two smaller groups are seen in route of collision with each other simultaneously. Within each of the four substructures, several galaxies with features indicative of jellyfish morphologies have been observed. In this paper, we propose a hydrodynamic mo…
Galactocentric acceleration in VLBI analysis. Findings of IVS WG8
Gipson, J. M.; Gordon, D.; MacMillan, D. S. +8 more
Aims: The IVS Working Group on Galactic Aberration (WG8) was established to investigate issues related to incorporating the effect of Galactic aberration in IVS analysis. The circular motion of the solar system barycenter around the Galactic center causes a change in aberration, which in the case of geodetic VLBI observing is over time scales…
Gaia 19ajj: A Young Star Brightening Due to Enhanced Accretion and Reduced Extinction
Hillenbrand, Lynne A.; Reipurth, Bo; Isaacson, Howard +2 more
We report on the source Gaia 19ajj, identifying it as a young star associated with a little-studied star-forming region seen along a complex line of sight through the Gum Nebula. The optical lightcurve recently recorded by Gaia exhibits a slow and unsteady 5.5 mag rise over about 3 yr, while the mid-infrared lightcurve from NEOWISE over the same t…
Transiting Planets Near the Snow Line from Kepler. I. Catalog
Kawahara, Hajime; Masuda, Kento
We present a comprehensive catalog of cool (period P ≳ 2 yr) transiting planet candidates in the 4 yr light curves from the prime Kepler mission. Most of the candidates show only one or two transits and have largely been missed in the original Kepler Object of Interest catalog. Our catalog is based on all known such candidates in the literature, a…
On the Orbital Decay of Globular Clusters in NGC 1052-DF2: Testing a Baryon-only Mass Model
van den Bosch, Frank C.; van Dokkum, Pieter; Dutta Chowdhury, Dhruba
The dark matter content of the ultra-diffuse galaxy NGC 1052-DF2, as inferred from globular cluster (GC) and stellar kinematics, carries a considerable amount of uncertainty, with current constraints also allowing for the complete absence of dark matter. We test the viability of such a scenario by examining whether in a “baryon-only” mass model th…