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Lithium in CEMP-no stars: A new constraint on the lithium depletion mechanism in the early universe*
Li, Haining; Matsuno, Tadafumi; Aoki, Wako +1 more
Most relatively warm, unevolved, metal-poor stars (Teff ≳ 5800 K and [Fe/H] ≲ -1.5) exhibit almost constant lithium abundances, irrespective of metallicity or effective temperature, and thus form the so-called Spite plateau. This was originally interpreted as arising from lithium created by the Big Bang nucleosynthesis. Recent observati…
Near-infrared variability study of the central 2.3 × 2.3 arcmin2 of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
Morris, Mark R.; Williams, Benjamin F.; Rich, R. Michael +8 more
Because of strong and spatially highly variable interstellar extinction and extreme source crowding, the faint (K ≥ 15) stellar population in the Milky Way's nuclear star cluster is still poorly studied. RR Lyrae stars provide us with a tool to estimate the mass of the oldest, relative dim stellar population. Recently, we analysed <italic>&l…
Charge States and FIP Bias of the Solar Wind from Coronal Holes, Active Regions, and Quiet Sun
Fu, Hui; Madjarska, Maria S.; Li, Bo +3 more
Connecting in situ measured solar-wind plasma properties with typical regions on the Sun can provide an effective constraint and test to various solar wind models. We examine the statistical characteristics of the solar wind with an origin in different types of source regions. We find that the speed distribution of coronal-hole (CH) wind is bimoda…
The ALMA Frontier Fields Survey. III. 1.1 mm emission line identifications in Abell 2744, MACSJ 0416.1-2403, MACSJ 1149.5+2223, Abell 370, and Abell S1063
Kneissl, R.; Demarco, R.; Laporte, N. +12 more
Context. Most sub-mm emission line studies of galaxies to date have targeted sources with known redshifts where the frequencies of the lines are well constrained. Recent blind line scans circumvent the spectroscopic redshift requirement, which could represent a selection bias.
Aims: Our aim is to detect emission lines present in continuum ori…
Temperature structure and kinematics of the IRDC G035.39-00.33
Caselli, Paola; Henshaw, Jonathan D.; Wang, Ke +6 more
Aims: Infrared dark clouds represent the earliest stages of high-mass star formation. Detailed observations of their physical conditions on all physical scales are required to improve our understanding of their role in fueling star formation.
Methods: We investigate the large-scale structure of the IRDC G035.39-00.33, probing the dense g…
The spatially resolved star formation history of mergers. A comparative study of the LIRGs IC 1623, NGC 6090, NGC 2623, and Mice
González Delgado, R. M.; Di Matteo, P.; Sánchez, S. F. +8 more
This paper presents the spatially resolved star formation history (2D-SFH) of a small sample of four local mergers: the early-stage mergers IC 1623, NGC 6090, and the Mice, and the more advanced merger NGC 2623, by analyzing IFS data from the CALIFA survey and PMAS in LArr mode. Full spectral fitting techniques are applied to the datacubes to obta…
Searching for Interstellar {{\rm{C}}}_{60}^{+} Using a New Method for High Signal-to-noise HST/STIS Spectroscopy
Gull, T. R.; Lallement, R.; Najarro, F. +9 more
Due to recent advances in laboratory spectroscopy, the first optical detection of a very large molecule has been claimed in the diffuse interstellar medium (ISM): {{{C}}}60+ (ionized Buckminsterfullerene). Confirming the presence of this molecule would have significant implications regarding the carbon budget and chemical com…
Electrostatic Potential Radiated by a Pulsating Charge in a Two-Electron Temperature Plasma
Henri, P.; Wattieaux, G.; Béghin, C. +2 more
Mutual impedance experiments have been developed to constrain the plasma bulk properties, such as density and temperature, of ionospheric and later space plasmas, through the electric coupling between an emitter and a receiver electric antennas. So far, the analytical modeling of such instruments has enabled to treat ionospheric plasmas, where cha…
Asteroseismic masses of retired planet-hosting A-stars using SONG
Huber, Daniel; Bedding, Timothy R.; Stello, Dennis +9 more
To better understand how planets form, it is important to study planet occurrence rates as a function of stellar mass. However, estimating masses of field stars is often difficult. Over the past decade, a controversy has arisen about the inferred occurrence rate of gas-giant planets around evolved intermediate-mass stars - the so-called 'retired A…
Current and Future Constraints on Primordial Magnetic Fields
Feng, Chang; Reichardt, Christian L.; Sutton, Dylan R.
We present new limits on the amplitude of potential primordial magnetic fields (PMFs) using temperature and polarization measurements of the cosmic microwave background (CMB) from Planck, the BICEP2/Keck Array, Polarbear, and SPTpol. We reduce twofold the 95% confidence upper limit on the CMB anisotropy power due to a nearly scale-invariant PMF, w…