Results 31 to 40 of about 55,137 (312)

DCT astrometry of very low-mass stars [PDF]

, 2016
Very low-mass stars (VLMs) are the smallest, least luminous stars in our galaxy, but nonetheless form one of the dominant (baryonic) populations. Precise distances and kinematics of VLMs can provide constraints on the smallest extremes of star formation,
Skinner, J.N., Skinner, Julie N, West, Andrew A., Faherty, Jacqueline K., Muirhead, Philip S. (5203135), West, A.A., Faherty, J.K., West, Andrew A. (5203129), Faherty, Jacqueline K. (5203138), Muirhead, Philip S., Muirhead, P.S., Skinner, Julie N (5203132)   +11 more
core   +1 more source

Evolutionary effects of mass loss in low-mass stars [PDF]

International Astronomical Union Colloquium, 1981
AbstractThe effects of mass loss on the evolution of low-mass stars (actual mass smaller than 1.4 Mʘ) are reviewed. The case of globular cluster stars is discussed in some detail, and it is shown that evolutionary theory sets quite precise limits to the mass-loss rate in population II red giants.
openaire   +1 more source

Tracing the Evolution of SMBHs and Stellar Objects in Galaxy Mergers: A Multi-mass Direct N-body Model

The Astrophysical Journal, 2023
By using direct N -body numerical simulations, we model the dynamical coevolution of two supermassive black holes (SMBHs) and the surrounding stars in merging galaxies. In order to investigate how different stellar components evolve during the merger, we
Shuo Li, Shiyan Zhong, Peter Berczik, Rainer Spurzem, Xian Chen, F. K. Liu   +5 more
doaj   +1 more source

Probing the composition of sub-millisecond rotating compact stars by r-modes instability

, 2012
We investigate the implications of the r-modes instability on the composition of a compact star rotating at a sub-millisecond period. In particular, the only viable astrophysical scenario for such an object, wich might present inside the Low Mass X-ray ...
Giuseppe Pagliara, Drago, Alessandro, Alessandro Drago, Pagliara, Giuseppe   +3 more
core   +1 more source

MgAl burning chain in M 54: The globular cluster-like properties of a nuclear star cluster

Astronomy & Astrophysics
In this study, we present the chemical abundances of Fe, Mg, Al, Si, and K for a sample of 233 likely member stars of M 54. All the stars were observed with the FLAMES high-resolution multi-object spectrograph mounted at the VLT.
Alvarez Garay D. A., Mucciarelli A., Ventura P., Bellazzini M., Covella S.   +4 more
doaj   +1 more source

Evolution and Nucleosynthesis of Primordial Low‐Mass Stars

The Astrophysical Journal, 2004
We discuss in detail the evolutionary properties of low mass stars M< 1 M(Solar) having metallicity lower than Z=10^(-6) from the pre- main sequence up to (almost) the end of the Asymptotic Giant Branch phase. We also discuss the possibility that the large [C,N/Fe] observed on the surface of the most Iron poor star presently known, HE0107-5240, may ...
I. PICARDI, A. CHIEFFI, M. LIMONGI, PISANTI, OFELIA, MIELE, GENNARO, G. MANGANO, O. STRANIERO, IMBRIANI, GIANLUCA   +7 more
openaire   +5 more sources

Zooming in on Individual Star Formation: Low- and High-Mass Stars [PDF]

Space Science Reviews, 2020
Star formation is a multi-scale, multi-physics problem ranging from the size scale of molecular clouds ($\sim$10s pc) down to the size scales of dense prestellar cores ($\sim$0.1 pc) that are the birth sites of stars. Several physical processes like turbulence, magnetic fields and stellar feedback, such as radiation pressure and outflows, are more or ...
Anna L. Rosen, Stella S. R. Offner, Sarah I. Sadavoy, Asmita Bhandare, Enrique Vázquez-Semadeni, Adam Ginsburg   +5 more
openaire   +2 more sources

A deep HST view of the open cluster NGC2158: Binaries, mass functions, and M-dwarf discontinuity

Astronomy & Astrophysics
A significant fraction of stars in both the Galactic field and stellar clusters belong to binary systems. Understanding their properties is therefore fundamental for a comprehensive picture of stellar structure, stellar evolution, and cluster dynamics ...
Marchuk A. V., Muratore F., Milone A. P., Legnardi M. V., D’Antona F., Cordoni G., Mastrobuono-Battisti A., Bortolan E., Dell’Agli F., Dondoglio E., Lagioia E. P., Marino A. F., Tailo M., Ventura C., Ventura P., Ziliotto T.   +15 more
doaj   +1 more source

European Standard Clinical Practice Guideline and EXPeRT Recommendations for the Diagnosis and Management of Gastroenteropancreatic Neuroendocrine Neoplasms in Children and Adolescents

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Pediatric gastroenteropancreatic neuroendocrine neoplasms (GEP‐NENs) are extremely rare and clinically heterogeneous. Management has largely been extrapolated from adult practice. This European Standard Clinical Practice Guideline (ESCP), developed by the EXPeRT network in collaboration with adult NEN experts, provides (adult) evidence ...
Michaela Kuhlen, Calogero Virgone, Antje Redlich, Michael Abele, Ricardo Lopez‐Almaraz, Tal Ben‐Ami, Ewa Bien, Gianni Bisogno, Maja Mazic Cesen, Andrea Ferrari, Malgorzata A. Krawczyk, Yves Reguerre, Dominik T. Schneider, Ines B. Brecht, Charlotte Rigaud, Bilgehan Yalcin, Rainer Claus, Christian Vokuhl, Constantin Lapa, Jörg Fuchs, Segolene Hescot, Thomas Walter, Julien Hadoux, Daniel Orbach   +23 more
wiley   +1 more source

Stellar and Orbital Characterization of Three Low Mass M Dwarf Binary Stars with Dynamical Spectroscopy from the Habitable Zone Planet Finder

The Astronomical Journal
Theoretical models of low-mass stars continue to be discrepant with observations when used to examine the mass–radius relationship and other physical parameters of individual stars.
Suhani Surana, Chad F. Bender, Caleb I. Cañas, Daniel M. Krolikowski, William D. Cochran, Mark Everett, Arvind F. Gupta, Shubham Kanodia, Suvrath Mahadevan, Andrew Monson, Joe P. Ninan, Leonardo A. Paredes, Paul Robertson, Arpita Roy, Christian Schwab, Gudmundur Stefansson   +15 more
doaj   +1 more source