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Chemical compositions and kinematics of the Hercules stream
Lambert, David L.; Reddy, Bacham E.; Ramya, P. +1 more
An abundance analysis is reported of 58-K giants identified by Famaey et al. (2005, A&A, 430, 165) as highly probable members of the Hercules stream selected from stars north of the celestial equator in the Hipparcos catalogue. The giants have compositions spanning the interval [Fe/H] from -0.17 to +0.42 with a mean value of +0.15 and relative…
Long-term R and V-band monitoring of some suitable targets for the link between ICRF and the future Gaia celestial reference frame
Souchay, J.; Taris, F.; Andrei, A. +3 more
Context. The Gaia astrometric mission of the European Space Agency was launched on December 2013. It will provide a catalog of 500 000 quasars. Some of these targets will be chosen to build an optical reference system that will be linked to the International Celestial Reference Frame (ICRF). The astrometric coordinates of these sources will have r…
Electric sail option for cometary rendezvous
Janhunen, Pekka; Quarta, Alessandro A.; Mengali, Giovanni
The recent successes of the European Rosetta mission have shown the possibility of a close observation with one of the most evasive celestial bodies in the Solar System, the comets, and the practical feasibility of a comet rendezvous to obtain detailed information and in situ measurements. This paper discusses a preliminary study of the transfer t…
InSight coordinates determination from direct-to-Earth radio-tracking and Mars topography model
Le Maistre, Sébastien
The InSight mission is planned to land on the surface of Mars in September 2016. Close to the equator in Elysium Planitia, in the vicinity of the Curiosity location, the exact landing site coordinates cannot be provided by the navigation team. The direct-to-Earth (DTE) Doppler measurements are rarely included in the early lander localization proce…
Protoplanetary Disk Shadowing by Gas Infalling onto the Young Star AK Sco
France, Kevin; Gómez de Castro, Ana I.; Loyd, Robert O. P. +2 more
Young solar-type stars grow through the accretion of material from the circumstellar disk during pre-main-sequence (PMS) evolution. The ultraviolet radiation generated in this process plays a key role in the chemistry and evolution of young planetary disks. In particular, the hydrogen Lyα line (Lyα) etches the disk surface by driving photoevaporat…
A VLA Survey for Faint Compact Radio Sources in the Orion Nebula Cluster
Williams, Jonathan P.; Sheehan, Patrick D.; Eisner, Josh A. +1 more
We present Karl G. Jansky Very Large Array 1.3, 3.6, and 6 cm continuum maps of compact radio sources in the Orion Nebular Cluster (ONC). We mosaicked 34 arcmin2 at 1.3 cm, 70 arcmin2 at 3.6 cm and 109 arcmin2 at 6 cm, containing 778 near-infrared detected young stellar objects and 190 Hubble Space Telescope-identi…
A Symmetric Inner Cavity in the HD 141569A Circumstellar Disk
Augereau, J. -C.; Boccaletti, A.; Lagrange, A. -M. +6 more
Some circumstellar disks, called transitional or hybrid disks, present characteristics of both protoplanetary disks (significant amount of gas) and debris disks (evolved structures around young main-sequence stars, composed of second generation dust, from collisions between planetesimals). Therefore, they are ideal astrophysical laboratories to wi…
Suzaku Wide-band All-sky Monitor measurements of duration distributions of gamma-ray bursts
Yamaoka, Kazutaka; Fukazawa, Yasushi; Hanabata, Yoshitaka +25 more
We report on the T90 and T50 duration distributions and their relations with spectral hardness using 1464 gamma-ray bursts (GRBs), which were observed by the Suzaku Wide-band All-sky Monitor (WAM) from 2005 August 4 to 2010 December 29. The duration distribution is clearly bimodal in three energy ranges (50-120, 120-250, and …
Long-term nadir observations of the O2 dayglow by SPICAM IR
Montmessin, F.; Fedorova, A.; Korablev, O. +4 more
The O2(a1Δg) dayglow at the 1.27 µm band on Mars is produced by the solar UV photolysis of ozone and quenched in collisions with CO2. The SPICAM IR instrument onboard the Mars Express orbiter observes the O2(a1Δg) emission in the Martian atmosphere starting from 200…
Kinematics and Magnetic Properties of a Light Bridge in a Decaying Sunspot
Guglielmino, S. L.; Romano, P.; Borrero, J. M. +7 more
We present the results obtained by analysing high spatial and spectral resolution data of the solar photosphere acquired by the CRisp Imaging SpectroPolarimeter at the Swedish Solar Telescope on 6 August 2011 of a large sunspot with a light bridge (LB) observed in NOAA AR 11263. These data are complemented by simultaneous Hinode Spectropolarimeter…