Search Publications
Constraining the thermally pulsing asymptotic giant branch phase with resolved stellar populations in the Small Magellanic Cloud
Boyer, Martha L.; Girardi, Léo; Dalcanton, Julianne J. +17 more
The thermally pulsing asymptotic giant branch (TP-AGB) experienced by low- and intermediate-mass stars is one of the most uncertain phases of stellar evolution and the models need to be calibrated with the aid of observations. To this purpose, we couple high-quality observations of resolved stars in the Small Magellanic Cloud (SMC) with detailed s…
A catalogue of stellar diameters and fluxes for mid-infrared interferometry
Meisenheimer, K.; Matter, A.; Jaffe, W. +14 more
We present the Mid-infrared stellar Diameters and Fluxes compilation Catalogue (MDFC) dedicated to long-baseline interferometry at mid-infrared wavelengths (3-13 µm). It gathers data for half a million stars, i.e. nearly all the stars of the Hipparcos-Tycho catalogue whose spectral type is reported in the SIMBAD data base. We cross-match 26 …
The chemical composition of HIP 34407/HIP 34426 and other twin-star comoving pairs
Lambert, D. L.; Endl, M.; Meléndez, J. +4 more
We conducted a high-precision elemental abundance analysis of the twin-star comoving pair HIP 34407/HIP 34426. With mean error of 0.013 dex in the differential abundances (Δ[X/H]), a significant difference was found: HIP 34407 is more metal rich than HIP 34426. The elemental abundance differences correlate strongly with condensation temperature, w…
A statistically significant lack of debris discs in medium separation binary systems
Wyatt, Mark C.; Kennedy, Grant M.; Su, Kate Y. L. +1 more
We compile a sample of 341 binary and multiple star systems with the aim of searching for and characterizing Kuiper belt-like debris discs. The sample is assembled by combining several smaller samples studied in previously published work with targets from two unpublished Herschel surveys. We find that 38 systems show excess emission at 70 or 100 &…
The mass-loss, expansion velocities, and dust production rates of carbon stars in the Magellanic Clouds
Goldman, Steven R.; Boyer, Martha L.; van Loon, Jacco Th +5 more
The properties of carbon stars in the Magellanic Clouds (MCs) and their total dust production rates are predicted by fitting their spectral energy distributions (SED) over pre-computed grids of spectra reprocessed by dust. The grids are calculated as a function of the stellar parameters by consistently following the growth for several dust species…
The spectral energy distributions of active galactic nuclei
Salvato, M.; Ricci, C.; Brown, M. J. I. +5 more
We present spectral energy distributions (SEDs) of 41 active galactic nuclei, derived from multiwavelength photometry and archival spectroscopy. All of the SEDs span at least 0.09 to 30 µm, but in some instances wavelength coverage extends into the X-ray, far-infrared, and radio. For some active galactic nuclei (AGNs) we have fitted the meas…
The scattered disc of HR 8799
Booth, Mark; Krivov, Alexander V.; Löhne, Torsten +1 more
HR 8799 is a young F0-type star with four directly imaged giant planets and two debris belts, one located exterior and another one interior to the region occupied by the planetary orbits. Not only having an architecture similar to that of our Solar system but also revealing dissimilarities such as high masses of planets, a huge radial extent, and …
The integrated properties of the CALIFA galaxies: model-derived galaxy parameters and quenching of star formation
Zezas, A.; Ciesla, L.; Charmandaris, V. +6 more
We present a study of the integrated properties of the 835 galaxies in the Calar-Alto Legacy Integral Field spectroscopy Area survey. To derive the main physical parameters of the galaxies we have fitted their UV-to-IR spectral energy distributions (SEDs) with sets of theoretical models using CIGALE. We perform a comparison of the integrated galax…
Prevalence of neutral gas in centres of merging galaxies-II: nuclear H I and multiwavelength properties
Srianand, R.; Gupta, N.; Dutta, R.
Using a sample of 38 radio-loud galaxy mergers at z ≤ 0.2, we confirm the high detection rate (∼84 per cent) of H I 21-cm absorption in mergers, which is significantly higher (∼4 times) than in non-mergers. The distributions of the H I column density [N({H I})] and velocity shift of the absorption with respect to the systemic redshift of the galax…
Variable dust emission by WC type Wolf-Rayet stars observed in the NEOWISE-R survey
Williams, P. M.
Photometry at 3.4 and 4.6 {µ m} of 128 Population I WC type Wolf-Rayet stars in the Galaxy and 12 in the Large Magellanic Cloud (LMC) observed in the WISE NEOWISE-R survey was searched for evidence of circumstellar dust emission and its variation. Infrared spectral energy distributions (SEDs) were assembled, making use of archival r, i, Z, a…