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Galactic calibration of the tip of the red giant branch
Clementini, Gisella; Da Costa, Gary; Mould, Jeremy
Indications from Gaia data release 2 are that the tip of the red giant branch (a population II standard candle related to the helium flash in low mass stars) is close to -4 in absolute I magnitude in the Cousins photometric system. Our sample is high-latitude southern stars from the thick disk and inner halo, and our result is consistent with long…
Rotating Solar Models with Low Metal Abundances as Good as Those with High Metal Abundances
Yang, Wuming
Standard solar models (SSMs) constructed in accord with low metal abundances disagree with seismically inferred results. We constructed rotating solar models with low metal abundances that included enhanced settling and convection overshoot. In one of our rotating models, AGSSr2a, the convection overshoot allowed us to recover the radius of the ba…
Formation of coronal rain triggered by impulsive heating associated with magnetic reconnection
Kohutova, P.; Verwichte, E.; Froment, C.
Context. Coronal rain consists of cool plasma condensations formed in coronal loops as a result of thermal instability. The standard models of coronal rain formation assume that the heating is quasi-steady and localised at the coronal loop footpoints.
Aims: We present an observation of magnetic reconnection in the corona and the associated im…
Angular momentum of z ∼ 1.5 galaxies and their local analogues with adaptive optics
Glazebrook, Karl; Fisher, Deanne B.; Obreschkow, Danail +9 more
We present stellar specific angular momentum j* measurements of two z ∼ 1.5 galaxies in the KGES sample and 12 DYNAMO z ∼ 0.1 analogues of high-redshift galaxies. We combine natural seeing integral field spectroscopic data to trace line emission out to high multiples of effective radius re, with adaptive optics assisted Keck/…
K2-288Bb: A Small Temperate Planet in a Low-mass Binary System Discovered by Citizen Scientists
Schlieder, Joshua E.; Howard, Andrew W.; Petigura, Erik A. +23 more
Observations from the Kepler and K2 missions have provided the astronomical community with unprecedented amounts of data to search for transiting exoplanets and other astrophysical phenomena. Here, we present K2-288, a low-mass binary system (M2.0 ± 1.0; M3.0 ± 1.0) hosting a small (R p = 1.9 R ⊕), temperate (T eq …
Cassini Composite Infrared Spectrometer (CIRS) Observations of Titan 2004-2017
Bézard, Bruno; Vinatier, Sandrine; Lellouch, Emmanuel +16 more
From 2004 to 2017, the Cassini spacecraft orbited Saturn, completing 127 close flybys of its largest moon, Titan. Cassini’s Composite Infrared Spectrometer (CIRS), one of 12 instruments carried on board, profiled Titan in the thermal infrared (7-1000 µm) throughout the entire 13 yr mission. CIRS observed on both targeted encounters (flybys) …
XMM-Newton observations of PSR J0726-2612, a radio-loud XDINS
Pintore, Fabio; Mereghetti, Sandro; Turolla, Roberto +4 more
We present the results of an XMM-Newton observation of the slowly rotating (P = 3.4 s), highly magnetized (B ≈ 3 × 1013 G) radio pulsar PSR J0726-2612. A previous X-ray observation with the Chandra satellite showed that some of the properties of PSR J0726-2612 are similar to those of the X-ray-dim isolated neutron stars (XDINSs), a smal…
Properties of the Umbral Filament Observed in Active Region NOAA 12529
Murabito, Mariarita; Guglielmino, Salvo L.; Romano, Paolo +2 more
Recent observations of the solar photosphere revealed the presence of elongated filamentary bright structures inside sunspot umbrae, called umbral filaments (UFs). These features differ in morphology, magnetic configuration, and evolution from light bridges (LBs) that are usually observed to intrude in sunspots. To characterize a UF observed in th…
Fluorine Abundances in the Galactic Disk
Cunha, Katia; Smith, Verne V.; Hayes, Christian R. +5 more
The chemical evolution of fluorine is investigated in a sample of Milky Way red giant stars that span a significant range in metallicity from [Fe/H] ∼ -1.3 to 0.0 dex. Fluorine abundances are derived from vibration-rotation lines of HF in high-resolution infrared spectra near 2.335 µm. The red giants are members of the thin and thick disk/ha…
CPCS 2.0 — new automatic tool for time-domain astronomy
Rybicki, K.; Wyrzykowski, Ł.; Zieliński, P. +3 more
The Cambridge Photometric Calibration Server (CPCS) has been designed to respond to the need of automated rapid photometric data calibration and dissemination for transient events, primarily from Gaia space mission. The Calibration Server has been in operation since 2013 and has been used to calibrate around 50 000 observations of hundreds of tran…