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Absolute Properties of the Eclipsing γ Dor Star V404 Lyrae
Koo, Jae-Rim; Hong, Kyeongsoo; Lee, Jae Woo +1 more
We present the first high-resolution spectra for the eclipsing binary V404 Lyr showing γ Dor pulsations, which we use to study its absolute properties. By fitting models to the disentangling spectrum of the primary star, we found that it has an effective temperature of T eff,1 = 7330 ± 150 K and a rotational velocity of v 1 s…
Paβ, Hα, and Attenuation in NGC 5194 and NGC 6946
Murphy, Eric; Schinnerer, Eva; Wong, Tony +5 more
We combine Hubble Space Telescope Paschen β (Paβ) imaging with ground-based, previously published Hα maps to estimate the attenuation affecting Hα, A(Hα), across the nearby, face-on galaxies NGC 5194 and NGC 6946. We estimate A(Hα) in ∼2000 independent 2″ ∼ 75 pc diameter apertures in each galaxy, spanning out to a galactocentric radius of almost …
Empirical completeness assessment of the Gaia DR2, Pan-STARRS 1, and ASAS-SN-II RR Lyrae catalogues
Mateu, Cecilia; Holl, Berry; Rimoldini, Lorenzo +1 more
RR Lyrae stars are an important and widely used tracer of the most ancient populations of our Galaxy, mainly due to their standard candle nature. The current availability of large-scale surveys of variable stars is allowing us to trace the structure of our entire Galaxy, even in previously inaccessible areas like the Galactic disc. In this work, w…
Hydrogenated fullerenes (fulleranes) in space
Zhang, Yong; Hsia, Chih-Hao; Sadjadi, Seyedabdolreza
Since the first laboratory synthesis of C60 in 1985, fullerene-related species have been proposed to interpret various astronomical features. After more than 25 years' efforts, several circumstellar and interstellar features have been convincingly assigned to C60, C70, and C
Applying Noether's Theorem to Matter in the Milky Way: Evidence for External Perturbations and Non-steady-state Effects from Gaia Data Release 2
Yanny, Brian; Gardner, Susan; Hinkel, Austin
We apply Noether's theorem to observations of main-sequence stars from the Gaia Data Release 2 archive to probe the matter distribution function of the Galaxy. That is, we examine the axial symmetry of stars at vertical heights z, $0.2\leqslant | z| \leqslant 3\,\mathrm{kpc}$ , to probe the quality of the angular momentum Lz as an integ…
The ALMA Frontier Fields Survey. V. ALMA Stacking of Lyman-Break Galaxies in Abell 2744, Abell 370, Abell S1063, MACSJ0416.1-2403 and MACSJ1149.5+2223
Kneissl, R.; Demarco, R.; Treister, E. +15 more
Context. The Hubble Frontier Fields offer an exceptionally deep window into the high-redshift universe, covering a substantially larger area than the Hubble Ultra-Deep field at low magnification and probing 1-2 mag deeper in exceptional high-magnification regions. This unique parameter space, coupled with the exceptional multi-wavelength ancillary…
The strange case of the peculiar spiral galaxy NGC 5474. New pieces of a galactic puzzle
Cignoni, M.; Tosi, M.; Bellazzini, M. +5 more
We present the first analysis of the stellar content of the structures and substructures identified in the peculiar star-forming galaxy NGC 5474, based on Hubble Space Telescope resolved photometry from the LEGUS survey. NGC 5474 is a satellite of the giant spiral M 101, and it is known to have a prominent bulge that is significantly off-set from …
The nearby spiral density-wave structure of the Galaxy: line-of-sight velocities of the Gaia DR2 main-sequence A, F, G, and K stars
Hou, Li-Gang; Gedalin, Michael; Jiang, Ing-Guey +2 more
Distances and velocities of ≈ 2400 000 main-sequence A, F, G, and K stars are collected from the second data release of ESA's Gaia astrometric mission. This material is analysed to find evidence of radial and azimuthal systematic non-circular motions of stars in the solar neighbourhood on the assumption that the system is subject to spiral density…
Assessing Spectroscopic Binary Multiplicity Properties Using Robo-AO Imaging
Stassun, Keivan G.; Mathieu, Robert D.; Laos, Emily
We present higher-order multiplicity results for 60 solar-type spectroscopic binaries based on 0.75 µm imaging data taken by the robotic adaptive optics (Robo-AO) system at the Kitt Peak 2.1 m telescope. Our contrast curves show sensitivity up to ∼5 mag at ∼1″ separation; at very small separations, we identify candidate companions from image…
Zodiacal light observations and its link with cosmic dust: A review
Lasue, Jeremie; Levasseur-Regourd, Anny-Chantal; Renard, Jean-Baptiste
The zodiacal light is a nightglow mostly visible along the plane of the ecliptic. It represents the background radiation associated with solar light scattered by the tenuous flattened interplanetary cloud of dust particles surrounding the Sun and the planets. It is an interesting subject of study, as the source of the micrometeoroids falling on Ea…