Search Publications
Census of ρ Ophiuchi candidate members from Gaia Data Release 2
Mora, A.; Cánovas, H.; Bombrun, A. +6 more
Context. The Ophiuchus cloud complex is one of the best laboratories to study the earlier stages of the stellar and protoplanetary disc evolution. The wealth of accurate astrometric measurements contained in the Gaia Data Release 2 can be used to update the census of Ophiuchus member candidates.
Aims: We seek to find potential new members of …
Evolved massive stars at low-metallicity. I. A source catalog for the Small Magellanic Cloud
Yang, Ming; Bonanos, Alceste Z.; Jiang, Bi-Wei +9 more
We present a clean, magnitude-limited (IRAC1 or WISE1 ≤ 15.0 mag) multiwavelength source catalog for the Small Magellanic Cloud (SMC) with 45 466 targets in total, with the purpose of building an anchor for future studies, especially for the massive star populations at low-metallicity. The catalog contains data in 50 different bands including 21 o…
Distances to molecular clouds at high galactic latitudes based on Gaia DR2
Macquart, Jean-Pierre; Xu, Ye; Yan, Qing-Zeng +4 more
We report the distances of molecular clouds at high Galactic latitudes (|b| > 10°) derived from parallax and G-band extinction (AG) measurements in the second Gaia data release, Gaia DR2. Aided by Bayesian analyses, we determined distances by identifying the breakpoint in the extinction AG toward molecular clouds and using…
Probing fragmentation and velocity sub-structure in the massive NGC 6334 filament with ALMA
André, Ph.; Arzoumanian, D.; Shimajiri, Y. +3 more
Context. Herschel imaging surveys of galactic interstellar clouds support a paradigm for low-mass star formation in which dense molecular filaments play a crucial role. The detailed fragmentation properties of star-forming filaments remain poorly understood, however, and the validity of the filament paradigm in the intermediate- to high-mass regim…
Masses and ages for metal-poor stars. A pilot programme combining asteroseismology and high-resolution spectroscopic follow-up of RAVE halo stars
Valentini, M.; García, R. A.; Chiappini, C. +10 more
Context. Very metal-poor halo stars are the best candidates for being among the oldest objects in our Galaxy. Samples of halo stars with age determination and detailed chemical composition measurements provide key information for constraining the nature of the first stellar generations and the nucleosynthesis in the metal-poor regime.
Aims: A…
Six new supermassive black hole mass determinations from adaptive-optics assisted SINFONI observations
Krajnović, Davor; Sarzi, Marc; Cappellari, Michele +4 more
Different massive black hole mass - host galaxy scaling relations suggest that the growth of massive black holes is entangled with the evolution of their host galaxies. The number of measured black hole masses is still limited and additional measurements are necessary to understand the underlying physics of this apparent coevolution. We add six ne…
Exoplanet characterisation in the longest known resonant chain: the K2-138 system seen by HARPS
Bouchy, F.; Deleuil, M.; Kirk, J. +36 more
The detection of low-mass transiting exoplanets in multiple systems brings new constraints to planetary formation and evolution processes and challenges the current planet formation theories. Nevertheless, only a mere fraction of the small planets detected by Kepler and K2 have precise mass measurements, which are mandatory to constrain their comp…
Feedback from OB stars on their parent cloud: gas exhaustion rather than gas ejection
Peretto, N.; Marsh, K.; Fuller, G. A. +1 more
Context. Stellar feedback from high-mass stars shapes the interstellar medium, and thereby impacts gas that will form future generations of stars. However, due to our inability to track the time evolution of individual molecular clouds, quantifying the exact role of stellar feedback on their star formation history is an observationally challenging…
A UV and optical study of 18 old novae with Gaia DR2 distances: mass accretion rates, physical parameters, and MMRD
Selvelli, Pierluigi; Gilmozzi, Roberto
We combine the results of our earlier study of the UV characteristics of 18 classical novae (CNe) with data from the literature and with the recent precise distance determinations from the Gaia satellite to investigate the statistical properties of old novae. All final parameters for the sample include a detailed treatment of the errors and their …
Contrast sensitivities in the Gaia Data Release 2
Cataldi, Gianni; Brandeker, Alexis
The source detection sensitivity of Gaia is reduced near sources. To characterise this contrast sensitivity is important for understanding the completeness of the Gaia data products, in particular when evaluating source confusion in lower resolution surveys such as photometric monitoring for transits. Here, we statistically evaluate the catalogue …