Results 21 to 30 of about 24,445,127 (303)

Pulsations in M dwarf stars [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2012
Abstract We present the results of the first theoretical non-radial, non-adiabatic pulsational study of M dwarf stellar models with masses in the range 0.1–0.5 M⊙. We find the fundamental radial mode to be unstable due to an ε mechanism, caused by deuterium (D) burning for the young 0.1 and 0.2 M⊙ models, by non-equilibrium He3 burning ...
Rodríguez-López, C., MacDonald, J., Moya, A.   +2 more
openaire   +2 more sources

Stellar Parameterization of LAMOST M Dwarf Stars [PDF]

The Astrophysical Journal Supplement Series, 2021
Abstract The M dwarf stars are the most common stars in the Galaxy, dominating the population of the Galaxy at faint magnitudes. Precise and accurate stellar parameters for M dwarfs are of crucial importance for many studies. However, the atmospheric parameters of M dwarf stars are difficult to determine.
Jiadong Li, Chao Liu, Bo Zhang, Hao Tian, Dan Qiu, Haijun Tian   +5 more
openaire   +2 more sources

Spectrophotometry of M and C Stars [PDF]

Symposium - International Astronomical Union, 1973
Abstract and SummarySurveys of M and C stars down to infrared magnitudes 12.m0 in two galactic regions in the direction Cygnus and anticentre are described. Infrared magnitudes are derived by a new method of calibration based on the use of a combination of crossed calcite plates and Polaroid HN32.
K. Nandy, P. Smriglio
openaire   +1 more source

The Ratio of the Numbers of Carbon Stars to M Stars in Galaxies [PDF]

International Astronomical Union Colloquium, 1989
Simulated populations of the AGB stars were calculated with different assumptions about mass loss, initial chemical composition and dredge-up efficiency. The early-AGB (E-AGB) phase was taken into account. The numbers of carbon and oxygen stars per 106 generated stars and the ratio (NC/NM) of these numbers were obtained.
openaire   +1 more source

Surface rotation of Kepler red giant stars [PDF]

, 2017
Kepler allows the measurement of starspot variability in a large sample of field red giants for the first time. With a new method that combines autocorrelation and wavelet decomposition, we measure 361 rotation periods from the full set of 17,377 ...
van Saders, J., P. G. Beck, S. Bloemen, Mathur, S., Pinsonneault, M.H., Ceillier, T., Tayar, J., Stello, D., D. Salabert, R. A. García, Bloemen, S., Saders, J. van, J. van Saders, Salabert, D., Garcia, R. A., García, R.A., T. Ceillier, S. Mathur, M. H. Pinsonneault, D. Stello, Beck, P.G., J. Tayar   +21 more
core   +1 more source

Evolution of a 16 M  star [PDF]

Monthly Notices of the Royal Astronomical Society, 1984
Etude de l'evolution d'une etoile de 16M ○. de la sequence principale jusqu'a la combustion de l'enveloppe de carbone. On veut comprendre la sensibilite des caracteristiques d'evolution, telles que la duree dans le temps, l'extension des regions convectives, etc., par rapport aux parametres physiques.
openaire   +1 more source

Four new planets around giant stars and the mass-metallicity correlation of planet-hosting stars [PDF]

, 2016
Context. Exoplanet searches have revealed interesting correlations between the stellar properties and the occurrence rate of planets. In particular, different independent surveys have demonstrated that giant planets are preferentially found around metal ...
R. A. Wittenmyer, Jordan, A., A. Jordán, R. P. Butler, Melo, C.H.F., R. Brahm, Rojo Rubke, Patricio, Jenkins, J., Wittenmyer, R. A., Jones, M.I., Jones, M. L., Wang, L., Jenkins, J.S., Jenkins, J. S., Olivares E., F., F. Olivares E., Jones Fernández, Matías Ignacio, Wittenmyer, R.A., Butler, R.P., Jordan, A, H. Drass, Melo, C. H. F., Wittenmyer, R .A., Jenkins, James Stewart, Jones, M. I., L. Wang, Drass, Holger, Olivares, E.F., J. S. Jenkins, C. H. F. Melo, Melo, C., Rojo, P., Brahm, R., Butler, R. P., Olivares, F., Wittenmyer, R, Olivares, E. F., Jordán Colzani, Andrés Cristóbal, Melo, C. H., Drass, H., Butler, R., M. I. Jones, P. Rojo   +42 more
core   +1 more source

Abundance Measurements of the Metal-poor M Subdwarf LHS 174 Using High-resolution Optical Spectroscopy

The Astronomical Journal
Metal-poor M subdwarfs are among the oldest stellar populations and carry valuable information about the chemical enrichment history of the Milky Way. The measurements of chemical abundances of these stars therefore provide essential insights into the ...
Neda Hejazi, Sébastien Lépine, Thomas Nordlander, Wei-Chun Jao, David R. Coria, Kathryn V. Lester   +5 more
doaj   +1 more source

Evolution of Stars with M ≥ 8 M ⊙ [PDF]

Symposium - International Astronomical Union, 1974
A review of research in the field of evolution of massive stars during the last three years is presented. The analysis of computed stellar models in the helium-burning stage provides evidence for the existence of neutrino emission predicted by the theory of universal Fermi-interaction.
A. G. Massevitch, A. V. Tutukov
openaire   +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