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Automated classification of Hipparcos unsolved variables
Rimoldini, L.; Mowlavi, N.; Nienartowicz, K. +14 more
We present an automated classification of stars exhibiting periodic, non-periodic and irregular light variations. The Hipparcos catalogue of unsolved variables is employed to complement the training set of periodic variables of Dubath et al. with irregular and non-periodic representatives, leading to 3881 sources in total which describe 24 variabi…
Asteroid (2867) Steins: Shape, topography and global physical properties from OSIRIS observations
Jorda, L.; Lamy, P. L.; Groussin, O. +4 more
The Rosetta spacecraft flew by Asteroid (2867) Steins on 5 September 2008, allowing the onboard OSIRIS cameras to collect the first images of an E-type asteroid. We implemented several three-dimensional reconstruction techniques to retrieve its shape. Limb profiles, combined with stereo control points, were used to reconstruct an approximate shape…
OPACOS: OVRO Post-AGB CO (1-0) Emission Survey. I. Data and Derived Nebular Parameters
Sahai, R.; Sánchez Contreras, C.
We have performed interferometric observations of the 12CO (J = 1-0) emission in a sample of 27 objects spanning different evolutionary stages from the late asymptotic giant branch (late-AGB), through the post-AGB (pAGB) phase, and to the planetary nebula (PN) stage, but dominated by pAGB objects and young PNs (>=81%). In this paper …
An inhomogeneous lepto-hadronic model for the radiation of relativistic jets. Application to XTE J1118+480
Romero, G. E.; Vila, G. S.; Casco, N. A.
Context. Conceptually reconstructing the physical conditions in relativistic jets, given the observed electromagnetic spectrum, is a complex inverse problem.
Aims: We aim to improve our understanding of the mechanisms operating in relativistic jets by modeling their broadband electromagnetic spectrum.
Methods: We develop an inhomogeneous…
Early-type Galaxies with Tidal Debris and Their Scaling Relations in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
Ho, Luis C.; Erroz-Ferrer, Santiago; Schinnerer, Eva +21 more
Tidal debris around galaxies can yield important clues on their evolution. We have identified tidal debris in 11 early-type galaxies (T <= 0) from a sample of 65 early types drawn from the Spitzer Survey of Stellar Structure in Galaxies (S4G). The tidal debris includes features such as shells, ripples, and tidal tails. A variety of t…
Two-plasma Model for Low Charge State Interplanetary Coronal Mass Ejection Observations
Zurbuchen, Thomas H.; Gruesbeck, Jacob R.; Lepri, Susan T.
Recent ACE/SWICS observations have revealed that ~5% of all in situ observed interplanetary coronal mass ejections include time periods with very low charge state ions found to be associated with prominence eruptions. It was also shown that these low charge state ions are often observed concurrently with very high charge state ions. But, the physi…
The Penn State-Toruń Centre for Astronomy Planet Search stars. I. Spectroscopic analysis of 348 red giants
Nowak, G.; Zieliński, P.; Adamów, M. +2 more
Aims: We present basic atmospheric parameters (Teff, log g, vt, and [Fe/H]) as well as luminosities, masses, radii, and absolute radial velocities for 348 stars, presumably giants, from the ~1000 star sample observed within the Penn State-Toruń Centre for Astronomy Planet Search with the High Resolution Spectrograph of t…
Quenched Cold Accretion of a Large-scale Metal-poor Filament due to Virial Shocking in the Halo of a Massive z = 0.7 Galaxy
Kacprzak, Glenn G.; Spitler, Lee R.; Steidel, Charles C. +4 more
Using HST/COS/STIS and HIRES/Keck high-resolution spectra, we have studied a remarkable H I absorbing complex at z = 0.672 toward the quasar Q1317+277. The H I absorption has a velocity spread of Δv = 1600 km s-1, comprises 21 Voigt profile components, and resides at an impact parameter of D = 58 kpc from a bright, high-mass (log M
Near- and mid-infrared colors of evolved stars in the Galactic plane. The Q1 and Q2 parameters
Menten, K. M.; Habing, H.; Churchwell, E. +1 more
Context. Mass-loss from evolved stars chemically enriches the interstellar medium (ISM). Stellar winds from massive stars and their explosions as supernovae shape the ISM and trigger star formation. Studying evolved stars is fundamental for understanding galaxy formation and evolution at any redshift.
Aims: We aim to establish a photometric c…
Resolved Measurements of X CO in NGC 6946
Momose, Rieko; Scoville, Nick; Kuno, Nario +9 more
We present the largest sample to date of giant molecular clouds (GMCs) in a substantial spiral galaxy other than the Milky Way. We map the distribution of molecular gas with high resolution and image fidelity within the central 5 kpc of the spiral galaxy NGC 6946 in the 12CO (J = 1-0) transition. By combining observations from the Nobey…