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Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions
Melnik, A. M.; Dambis, A. K.
We calculated the median parallaxes for 47 OB associations including at least 10 stars with known Gaia DR2 parallaxes. A comparison between trigonometric and photometric parallaxes of OB associations reveals a zero-point offset of
Style and intensity of hydration among C-complex asteroids: A comparison to desiccated carbonaceous chondrites
Vernazza, P.; Usui, F.; Schmitt, B. +3 more
Here we report a comparison between reflectance spectroscopy of meteorites under asteroidal environment (high vacuum and temperature) and Main Belt and Near Earth Asteroids spectra. Focusing on the -OH absorption feature around 3 µm, we show that the asteroidal environment induces a reduction of depth and width of the band, as well as a shif…
Powerful ionized gas outflows in the interacting radio galaxy 4C+29.30
Storchi-Bergmann, Thaisa; Riffel, Rogemar A.; Couto, Guilherme S. +2 more
We investigate the ionized gas excitation and kinematics in the inner $4.3\, \times \, 6.2$ kpc2 of the merger radio galaxy 4C+29.30. Using optical integral field spectroscopy with the Gemini North Telescope, we present flux distributions, line-ratio maps, peak velocities and velocity dispersion maps as well as channel maps with a spati…
A Photoionized Accretion Disk around a Young High-mass Star
Sanhueza, Patricio; Garay, Guido; Guzmán, Andrés E. +2 more
We present high spatial resolution (52 au) observations of the high-mass young stellar object (HMYSO) G345.4938+01.4677 made using the Atacama Large Millimeter/submillimeter Array. This O-type HMYSO is located at 2.38 kpc and is associated with a luminosity of 1.5 × 105 L⊙. We detect circumstellar emission from the H38β hydro…
The Sizes of z ∼ 9-10 Galaxies Identified in the Brightest of Reionizing Galaxies (BoRG) Survey
Holwerda, Benne W.; Bradley, Larry; Livermore, Rachael +5 more
Redshift z = 9-10 object selection is the effective limit of Hubble Space Telescope (HST) imaging capability, even when confirmed with Spitzer. If only a few photometry data points are available, it becomes attractive to add criteria based on their morphology in these J- and H-band images. One could do so through visual inspection, a size criterio…
Using the "Ghost Front" to Predict the Arrival Time and Speed of CMEs at Venus and Earth
Wang, Yuming; Shen, Chenglong; Lockwood, Mike +7 more
Using in situ measurements and remote-sensing observations, we study two coronal mass ejections (CMEs) that left the Sun on 2012 June 13-14 and impacted both Venus and Earth while the planets were in close radial alignment. The two CMEs generate multiple fronts in Solar Terrestrial Relations Observatory (STEREO)/Heliospheric Imager (HI) images, wh…
Isochrone fitting of Galactic globular clusters - II. NGC 6205 (M13)
Gontcharov, George A.; Mosenkov, Aleksandr V.; Khovritchev, Maxim Yu
We present new isochrone fits to colour-magnitude diagrams of the Galactic globular cluster NGC 6205 (M13). We utilize 34 photometric bands from the ultraviolet to mid-infrared by use of data from the HST, Gaia DR2, SDSS, unWISE, Pan-STARRS DR1, and other photometric sources. In our isochrone fitting we use the PARSEC, MIST, DSEP, BaSTI, and IAC-B…
Star Formation and Evolution of Blister-type H II Region Sh2-112
Bhatt, B. C.; Dewangan, L. K.; Ojha, D. K. +4 more
We report the observational findings of the Sh2-112 H II region by using the multiwavelength data analysis ranging from optical to radio wavelengths. This region is powered by the massive O8V-type star BD +45 3216. The surface density distribution and minimum spanning tree analyses of the young stellar object (YSO) candidates in the region reveal …
Cross-correlation of Far-infrared Background Anisotropies and CMB Lensing from Herschel and Planck Satellites
Gong, Yan; Cooray, Asantha; Chen, Xuelei +3 more
The cosmic infrared background (CIB) anisotropies and cosmic microwave background (CMB) lensing are powerful measurements for exploring cosmological and astrophysical problems. In this work, we measure the autocorrelation power spectrum of the CIB anisotropies in the Herschel-SPIRE HerMES Large Mode Survey (HeLMS) field, and the cross-power spectr…
Spectroscopy of hot γ Doradus and A-F hybrid Kepler candidates close to the hot border of the δ Scuti instability strip
Handler, G.; Poretti, E.; Rainer, M. +4 more
If γ Dor-type pulsations are driven by the convective blocking mechanism, a convective envelope at a sufficient depth is essential. There are several hot γ Dor and hybrid star candidates in which there should not be an adequate convective envelope to excite the γ Dor-type oscillations. The existence of these hot objects needs an explanation. There…