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Globules and pillars in Cygnus X. III. Herschel and upGREAT/SOFIA far-infrared spectroscopy of the globule IRAS 20319+3958 in Cygnus X
Comerón, F.; Schneider, N.; Bontemps, S. +11 more
IRAS 20319+3958 in Cygnus X South is a rare example of a free-floating globule (mass ~240 M⊙, length ~1.5 pc) with an internal H II region created by the stellar feedback of embedded intermediate-mass stars, in particular, one Herbig Be star. In Schneider et al. 2012, (A&A, 542, L18) and Djupvik et al. 2017, (A&A, 599, A37), we …
Mapping the tilt of the Milky Way bulge velocity ellipsoids with ARGOS and Gaia DR2
Lewis, Geraint F.; Bland-Hawthorn, Joss; Koposov, Sergey E. +4 more
Until the recent advent of Gaia Data Release 2 (DR2) and deep multi-object spectroscopy, it has been difficult to obtain 6D phase space information for large numbers of stars beyond 4 kpc, in particular towards the Galactic Centre, where dust and crowding are significant. We combine line-of-sight velocities from the Abundances and Radial velocity …
Evolved massive stars at low-metallicity. IV. Using the 1.6 µm H-bump to identify red supergiant stars: Case study of NGC 6822
Yang, Ming; Bonanos, Alceste Z.; Gao, Jian +9 more
We present a case study in which we used a novel method to identify red supergiant (RSG) candidates in NGC 6822 based on their 1.6 µm H-bump. We collected 32 bands of photometric data for NGC 6822 ranging from the optical to the mid-infrared, derived from Gaia, PS1, LGGS, VHS, UKIRT, IRSF, HAWK-I, Spitzer, and WISE. Using the theoretical spe…
Topographic correction of HiRISE and CaSSIS images: Validation and application to color observations of Martian albedo features
Pajola, M.; Cremonese, G.; Thomas, N. +5 more
The topographic correction of satellite images has to be applied to both disentangle albedo features from illumination effects induced by local topography and perform spectrophotometric analyses of planetary surfaces. This work focuses on the modeling and removal of surface brightness variations induced by topography, referred as topographic shadi…
The behaviour of lithium at high metallicity in the Milky Way. Selection effects in the samples and the possible role of atomic diffusion
de Laverny, P.; Charbonnel, C.; Prantzos, N. +1 more
Aims: We revisit large spectroscopic data sets for field stars from the literature to derive the upper Li envelope in the high metallicity regime in our Galaxy.
Methods: We take advantage of Gaia EDR3 data and state-of-the-art stellar models to precisely determine the position of the sample dwarf stars in the Hertzsprung-Russell diagram.…
Distance and Mass of the NGC 253 Galaxy Group
Anand, Gagandeep S.; Shaya, Edward J.; Tully, R. Brent +2 more
Two dwarf galaxies, WOC2017-07 and PGC 704814, located in the vicinity of the nearby luminous spiral galaxy NGC 253 were observed with the Advanced Camera for Surveys on the Hubble Space Telescope. Their distances of 3.62 ± 0.18 Mpc and 3.66 ± 0.18 Mpc were derived using the tip of the red giant branch method. These distances are consistent with t…
First MATISSE L-band observations of HD 179218. Is the inner 10 au region rich in carbon dust particles?
Waters, L. B. F. M.; Meisenheimer, K.; Augereau, J. -C. +58 more
Context. Carbon is one of the most abundant components in the Universe. While silicates have been the main focus of solid phase studies in protoplanetary discs (PPDs), little is known about the solid carbon content especially in the planet-forming regions (~0.1-10 au). Fortunately, several refractory carbonaceous species present C-H bonds (such as…
Precision of the Chinese Space Station Telescope (CSST) stellar radial velocities
Yuan, Hai-Bo; Sun, Yang; Deng, Ding-Shan
The Chinese Space Station Telescope (CSST) spectroscopic survey plans to deliver high-quality low-resolution (R > 200) slitless spectra for hundreds of millions of targets down to a limiting magnitude of about 21 mag, covering a large survey area (17 500 deg2) and a wide wavelength range (255-1000 nm by three bands GU, GV, and GI). I…
Photoionisation modelling of the X-ray emission line regions within the Seyfert 2 AGN NGC 1068
Bianchi, S.; Mehdipour, M.; Behar, E. +4 more
Aims: We investigate the photoionised X-ray emission line regions (ELRs) within the Seyfert 2 galaxy NGC 1068 to determine if there are any characteristic changes between observations taken 14 years apart.
Methods: We compared XMM-Newton observations collected in 2000 and 2014, simultaneously fitting the reflection grating spectrometer a…
New Families in our Solar Neighborhood: Applying Gaussian Mixture Models for Objective Classification of Structures in the Milky Way and in Simulations
Faucher-Giguère, Claude-André; Sharma, Sanjib; Bonaca, Ana +10 more
The standard picture of galaxy formation motivates the decomposition of the Milky Way into 3-4 stellar populations with distinct kinematic and elemental abundance distributions: the thin disk, thick disk, bulge, and stellar halo. To test this idea, we construct a Gaussian mixture model (GMM) for both simulated and observed stars in the solar neigh…