Results 31 to 40 of about 13,442,946 (252)

A survey for low mass spectroscopic binary stars in the young clusters around sigma Orionis and lambda Orionis [PDF]

, 2008
We have obtained multi-epoch, high-resolution spectroscopy of 218 candidate low-mass stars and brown dwarfs in the young clusters around sigma Ori and lambda Ori. We find that 196 targets are cluster members based on their radial velocity, the equivalent

core   +1 more source

The accretion/ejection paradigm of low mass stars tested with HST [PDF]

, 2019
Low-mass stars and brown dwarfs: IMF, accretion and activity ,Volterra, Italy, 17-20 October 2004In the last few years new investigation techniques have allowed us to study in depth the spectacular phenomenon of protostellar jets, and to test the ...
Coffey, Deirdre, Eislöffel, Jochen, Bacciotti, Francesca, Woitas, Jens, Ray, Thomas P.   +4 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

Nucleosynthesis in low-mass stars: Shedding light on the cosmic origin of heavy elements [PDF]

EPJ Web of Conferences
Low-mass, low-metallicity stars while evolving through the asymptotic giant branch (AGB) phase undergo significant nucleosynthesis producing the majority of slow (s-) and intermedite (i-) neutron capture elements.
Goswami Aruna
doaj   +1 more source

On Low Mass AGB Stars [PDF]

Symposium - International Astronomical Union, 1991
Recent results on low mass AGB stars are presented. Observed amounts of AGB mass loss imply that thermal pulses will only be encountered for stars of initial mass less than about 4M⊙ for Pop I and 3 M⊙ for Pop II. Mc – L, Me – τif, and Mc – Tb relations are summarized.
I.-Juliana Sackmann, Arnold I. Boothroyd
openaire   +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

Facing the phase: Gravity-mode offset and buoyancy glitches in stars on the red-giant branch

Astronomy & Astrophysics
Context. With the increasing precision of asteroseismic observations, it becomes possible to reliably measure oscillation properties of an increasing number of stars. Interpreting these measurements requires a good theoretical understanding of their link
van Lier T., Müller J., Hekker S.
doaj   +1 more source

The Impact of the COVID‐19 Pandemic on Childhood Cancer Survival: A Population‐Based Assessment of Survival Patterns Between 2015 and 2023 in Germany

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Numerous international studies have reported declines in new cancer diagnoses, delayed diagnoses and disruptions in cancer treatment following the implementation of COVID‐19 pandemic public health measures, raising concerns that these effects may ultimately contribute to increased cancer mortality.
Friederike Erdmann, Maike Wellbrock, Javier Louro, Arndt Borkhardt, Martin Schrappe, Claudia Trübenbach, Desiree Grabow, Cécile M. Ronckers, Joachim Schüz   +8 more
wiley   +1 more source

Adiabatic Mass Loss in Binary Stars. IV. Low- and Intermediate-mass Helium Binary Stars

The Astrophysical Journal Supplement Series
The unstable mass transfer situation in binary systems will asymptotically cause the adiabatic expansion of the donor star and finally lead to the common envelope phase.
Lifu Zhang, Hongwei Ge, Xuefei Chen, Zhanwen Han   +3 more
doaj   +1 more source