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Confronting expansion distances of planetary nebulae with Gaia DR2 measurements
Steffen, M.; Schönberner, D.
Context. Individual distances to planetary nebulae are of the utmost relevance for our understanding of post-asymptotic giant-branch evolution because they allow a precise determination of stellar and nebular properties. Also, objects with individual distances serve as calibrators for the so-called statistical distances based on secondary nebular …
Distribution of red clump stars does not support the X-shaped Galactic bulge
López-Corredoira, M.; Lee, Y. -W.; Garzón, F. +1 more
Context. Claims of an X-shaped Galactic bulge were based on the assumption of red clump stars as standard candles in some lines of sight crossing the off-plane bulge. However, some doubts have been cast on whether the two peaks in star counts along the line of sight really represent a double peak in the density distribution, or whether there is so…
Re-reduction of CCD astrometric observations of Neptunian satellites in 2006-2007 based on Gaia DR2 and comparison with ephemerides
Cheng, X.; Yan, D.; Qiao, R. C. +3 more
Based on the newly released Gaia DR2 star catalogue, the CCD images of Neptunian satellites taken by the telescopes at Xinglong Observatory of National Astronomical Observatory in 2006-2007 were re-reduced. A total of 174 satellite positions were derived, including 34 new observed positions of Triton, 28 new and 112 updated observed positions of N…
A spectral synergy method to retrieve martian water vapor column-abundance and vertical distribution applied to Mars Express SPICAM and PFS nadir measurements
Montmessin, F.; Ferron, S.
Up to now, all attempts to retrieve martian water vapor from nadir observations have focused their analysis on a single spectral domain and comparison between the results of various experiments showed the difficulty to reconcile the water vapor datasets together. Inspired by a methodology recently developed for the analysis of Earth observations, …
Hierarchical Bayesian model to infer PL(Z) relations using Gaia parallaxes
Sarro, L. M.; Clementini, G.; Garofalo, A. +2 more
In a recent study we analysed period-luminosity-metallicity (PLZ) relations for RR Lyrae stars using the Gaia Data Release 2 (DR2) parallaxes. It built on a previous work that was based on the first Gaia Data Release (DR1), and also included period-luminosity (PL) relations for Cepheids and RR Lyrae stars. The method used to infer the relations fr…
FIGS: spectral fitting constraints on the star formation history of massive galaxies since the cosmic noon
Finkelstein, Steven L.; Pirzkal, Nor; Hathi, Nimish +16 more
We constrain the stellar population properties of a sample of 52 massive galaxies - with stellar mass log (Ms/M⊙) ≳ 10.5 - over the redshift range 0.5 < z < 2 by use of observer-frame optical and near-infrared slitless spectra from Hubble Space Telescope's ACS and WFC3 grisms. The deep exposures (∼100 ks) allow us to ta…
The search campaign to identify and image the Philae Lander on the surface of comet 67P/Churyumov-Gerasimenko
Sierks, H.; Güttler, C.; Deller, J. +30 more
On the 12th of November 2014, the Rosetta Philae Lander descended to make the first soft touchdown on the surface of a comet - comet 67P/Churyumov-Gerasimenko. That soft touchdown did occur but due to the failure in the firing of its two harpoons, Philae bounced and travelled across the comet making contact with the surface twice more before final…
Dynamical Masses for the Hyades Binary 80 Tauri
Torres, Guillermo
The empirical mass-luminosity relation in the Hyades cluster rests on dynamical mass determinations for five binary systems, of which one is eclipsing and the other four are visual or interferometric binaries. The last one was identified and first measured more than 20 yr ago. Here we present dynamical mass measurements for a new binary system in …
Active Galactic Nuclei in Dusty Starbursts at z = 2: Feedback Still to Kick in
Daddi, E.; Rodighiero, G.; Rujopakarn, W. +18 more
We investigate a sample of 152 dusty sources at 1.5 < z < 2.5 to understand the connection of enhanced star formation rate (SFR) and black hole accretion rate. The sources are Herschel-selected, having stellar masses M * > 1010 M ⊙ and SFR (∼100-1000 M ⊙ yr-1) elevated (>4×) above …
SLUG IV: a novel forward-modelling method to derive the demographics of star clusters
Calzetti, Daniela; Fumagalli, Michele; Adamo, Angela +1 more
We describe a novel method for determining the demographics of a population of star clusters, for example distributions of cluster mass and age, from unresolved photometry. This method has a number of desirable properties: it fully exploits all the information available in a data set without any binning, correctly accounts for both measurement err…