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[C I](1-0) and [C I](2-1) in Resolved Local Galaxies
Hunt, Leslie K.; Wilson, Christine D.; Rosolowsky, Erik +16 more
We present resolved [C I] line intensities of 18 nearby galaxies observed with the SPIRE FTS spectrometer on the Herschel Space Observatory. We use these data along with resolved CO line intensities from J up = 1 to 7 to interpret what phase of the interstellar medium the [C I] lines trace within typical local galaxies. A tight, linear …
The Araucaria project: High-precision orbital parallax and masses of eclipsing binaries from infrared interferometry
Weber, M.; Kervella, P.; Tkachenko, A. +9 more
Context. The precise determinations of stellar mass at ≲1% provide important constraints on stellar evolution models. Accurate parallax measurements can also serve as independent benchmarks for the next Gaia data release.
Aims: We measured the masses and distance of binary systems with a precision level better than 1% using a fully geometrica…
Fractal statistics in young star clusters: structural parameters and dynamical evolution
Hetem, Annibal; Gregorio-Hetem, Jane
We used fractal statistics to quantify the degree of observed substructures in a sample of 50 embedded clusters and more evolved open clusters (< 100 Myr) found in different galactic regions. The observed fractal parameters were compared with N-body simulations from the literature, which reproduce star-forming regions under different initial co…
The evolution of carbon-polluted white dwarfs at low effective temperatures
Blouin, Simon; Dufour, Patrick
Taking advantage of the Gaia Data Release 2, recent studies have revisited the evolution of carbon-polluted white dwarfs (DQs) across a large range of effective temperatures. These analyses have clearly confirmed the existence of two distinct DQ evolutionary sequences: one with normal-mass white dwarfs and one with heavily polluted and generally m…
The angular momentum of disc galaxies at z = 1
Fraternali, F.; Di Teodoro, E. M.; Oosterloo, T. +3 more
We investigate the relation between stellar mass (M⋆) and specific stellar angular momentum (j⋆), or "Fall relation", for a sample of 17 isolated, regularly rotating disc galaxies at z ∼ 1. All galaxies have rotation curves determined from Hα emission-line data; HST imaging in optical and infrared filters; and robust determin…
Galactic Rotation and the Oort Constants in the Solar Vicinity
Zhao, Gang; Li, Chengdong; Yang, Chengqun
Gaia DR2 data are used to calculate the Oort constants and derive the Galactic rotational properties in this work. We choose the solar vicinity stars with a “clean” sample within 500 pc. The Oort constants are then fitted through the relation between the proper motions as a function of Galactic longitude l. A maximum likelihood method is adopted t…
Multi-scale analysis of the Monoceros OB 1 star-forming region. II. Colliding filaments in the Monoceros OB1 molecular cloud
Sanhueza, Patricio; Soam, Archana; Doi, Yasuo +24 more
Context. We started a multi-scale analysis of star formation in G202.3+2.5, an intertwined filamentary sub-region of the Monoceros OB1 molecular complex, in order to provide observational constraints on current theories and models that attempt to explain star formation globally. In the first paper (Paper I), we examined the distributions of dense …
Spectral and Timing Analysis of the Accretion-powered Pulsar 4U 1626-67 Observed with Suzaku and NuSTAR
Enoto, Teruaki; Chakrabarty, Deepto; Terada, Yukikatsu +13 more
We present an analysis of the spectral shape and pulse profile of the accretion-powered pulsar 4U 1626-67 observed with Suzaku and Nuclear Spectroscopic Telescope Array (NuSTAR) during a spin-up state. The pulsar, which experienced a torque reversal to spin-up in 2008, has a spin period of ∼7.7 s. Comparing the phase-averaged spectra obtained with…
Lyα in the GJ 1132 System: Stellar Emission and Planetary Atmospheric Evolution
Charbonneau, David; Kempton, Eliza M. -R.; Newton, Elisabeth +6 more
GJ 1132b, which orbits an M dwarf, is one of the few known Earth-sized planets, and at 12 pc away it is one of the closest known transiting planets. Receiving roughly 19× Earth’s insolation, this planet is too hot to be habitable but can inform us about the volatile content of rocky planet atmospheres around cool stars. Using Hubble Space Telescop…
Kronoseismology III: Waves in Saturn's inner C ring
Nicholson, Philip D.; French, Richard G.; McGhee-French, Colleen A. +1 more
We investigate waves driven in Saturn's rings by planetary normal modes, concentrating on the previously unexplored inner C ring. In this region, the known waves all have exceptionally short wavelengths, which has proven problematic for previous studies that depended on the accurate estimate of wave phases for wave identification. However, detaile…