Results 31 to 40 of about 1,811,299 (294)

The “Building Blocks” of Stellar Halos

Galaxies, 2017
The stellar halos of galaxies encode their accretion histories. In particular, the median metallicity of a halo is determined primarily by the mass of the most massive accreted object.
Kyle A. Oman, Else Starkenburg, Julio F. Navarro   +2 more
doaj   +1 more source

Nitrogen-enriched, Highly Pressurized Nebular Clouds Surrounding a Super Star Cluster at Cosmic Noon

The Astrophysical Journal, 2023
Strong lensing offers a precious opportunity for studying the formation and early evolution of super star clusters that are rare in our cosmic backyard.
Massimo Pascale, Liang Dai, Christopher F. McKee, Benny T.-H. Tsang   +3 more
doaj   +1 more source

Disentangling planetary orbits from stellar activity in radial-velocity surveys [PDF]

, 2013
The majority of extra-solar planets have been discovered (or confirmed after follow-up) through radial-velocity (RV) surveys. Using ground-based spectrographs such as High Accuracy Radial Velocity Planetary Search (HARPS) and HARPS-North, it is now ...
Segransan, Damien, Pollacco, Don, Fares, R, Pollacco, D, Queloz, D., Haywood, R.D., Pollacco, D., Gillon, M, Gillon, M., Barros, SCC, Lanza, AF, Pepe, F., Cameron, A. Collier, Hatzes, A., Ségransan, D., Lovis, C, Lovis, Christophe, Moutou, C, Barros, S. C. C., Santerne, A., Unruh, Y., Haywood, R. D., Unruh, Y, Fares, R., Segransan, D, Moutou, C., Deleuil, M., Barros, S.C.C., Cameron, AC, Lanza, A.F., Pepe, F, Deleuil, M, Haywood, RD, Gillon, Michaël, Pepe, Francesco Alfonso, Santerne, A, Queloz, Didier, Lovis, C., Cameron, A.C., Hatzes, A, Lanza, A. F., Queloz, D   +41 more
core   +1 more source

Stellar magnetism : empirical trends with age and rotation [PDF]

, 2014
AAV acknowledges support from a Royal Astronomical Society Fellowship and from the Swiss National Science Foundation via an Ambizione Fellowship. SGG acknowledges support from the Science and Technology Facilities Council (STFC) via an Ernest Rutherford ...
G. Hussain, Jeffers, S., Do Nascimento Jr., J.D., Waite, I.A., R. Fares, Folsom, C. P., Gregory, S. G.; id_orcid, P. Petit, Gregory, S. G., Hussain, G., do Nascimento, J. D., Donati, J. -F., Jardine, M., M. Jardine, Vidotto, A. A., Petit, P., I. A. Waite, Marsden, S., S. Marsden, Vidotto, A. A, Nascimento Júnior, José Dias do, Donati, J.F., J. Bouvier, J. Morin, J. D. Do Nascimento, Nascimento, J. D. Do, C. P. Folsom, Donati, J. F., Morin, J., Bouvier, J., J. F. Donati, Waite, I. A., Gregory, S.G., Jeffers, Sandra V., Fares, R., Hussain, G. A. J., Cameron, A. C., A. A. Vidotto, Morin, Julien, do Nascimento Jr., J.-D., A. C. Cameron, S. Jeffers, Cameron, A.C., S. G. Gregory, Vidotto, A.A., Folsom, C.P.   +45 more
core   +1 more source

The AIMSS Project – III. The stellar populations of compact stellar systems [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
In recent years, a growing zoo of compact stellar systems (CSSs) have been found whose physical properties (mass, size, velocity dispersion) place them between classical globular clusters (GCs) and true galaxies, leading to debates about their nature. Here we present results using a so far underutilized discriminant, their stellar population properties.
Janz, J, Norris, MA, Forbes, DA, Huxor, A, Romanowsky, AJ, Frank, MJ, Escudero, CG, Faifer, FR, Forte, JC, Kannappan, SJ, Marason, C, Brodie, JP, Strader, J, Thompson, BR   +13 more
openaire   +7 more sources

New Generation Stellar Spectral Libraries in the Optical and Near-infrared. I. The Recalibrated UVES-POP Library for Stellar Population Synthesis

The Astrophysical Journal Supplement Series, 2023
We present reprocessed flux-calibrated spectra of 406 stars from the UVES-POP stellar library in the wavelength range 320–1025 nm, which can be used for stellar population synthesis.
Sviatoslav B. Borisov, Igor V. Chilingarian, Evgenii V. Rubtsov, Cédric Ledoux, Claudio Melo, Kirill A. Grishin, Ivan Yu. Katkov, Vladimir S. Goradzhanov, Anton V. Afanasiev, Anastasia V. Kasparova, Anna S. Saburova   +10 more
doaj   +1 more source

STELLAR POPULATION VARIATIONS IN THE MILKY WAY's STELLAR HALO [PDF]

The Astronomical Journal, 2010
If the stellar halos of disk galaxies are built up from the disruption of dwarf galaxies, models predict highly structured variations in the stellar populations within these halos. We test this prediction by studying the ratio of blue horizontal branch stars (BHB stars; more abundant in old, metal-poor populations) to main-sequence turn-off stars (MSTO
Bell, Eric F., Xue, Xiang Xiang, Rix, Hans-Walter, Ruhland, Christine, Hogg, David W.   +4 more
openaire   +2 more sources

Acute Neurological Events in Children With Hemoglobin SC Disease: A Multicenter Retrospective Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Introduction Neurological manifestations in children with hemoglobin SC (HbSC) disease remain insufficiently characterized, particularly regarding acute events. The aim of this study was to describe the spectrum and frequency of acute neurological events in a multicenter cohort of children with HbSC disease.
Célia Paulmin, Bérengère Koehl, Audrey Maudoux, Hanine Mansour, Marie‐Hélène Odievre, Nathalie Garrec, Emilie Georget, Cécile Arnaud, Slimane Allali, Lydia Doumdo, Marie Belloy, Corinne Guitton   +11 more
wiley   +1 more source

Low-metallicity stellar halo populations as tracers of dark matter haloes [PDF]

, 2014
We analyse the density profiles of the stellar halo populations in eight Milky Way mass galaxies, simulated within the Λcold dark matter scenario. We find that accreted stars can be well fitted by an Einasto profile, as well as any subsample defined ...
Tissera, Patricia Beatriz, Scannapieco, Cecilia   +1 more
core   +1 more source

Eccentricities of Close Stellar Binaries

The Astrophysical Journal Letters
Orbits of stellar binaries are in general eccentric. These eccentricities encode information about their early lives. Here, we use thousands of main-sequence binaries from the Gaia DR3 catalog to reveal that binaries inward of a few astronomical units ...
Yanqin Wu, Sam Hadden, Janosz Dewberry, Kareem El-Badry, Christopher D. Matzner   +4 more
doaj   +1 more source