Results 61 to 70 of about 1,262,170 (343)

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

Low-mass companions to Hyades stars

, 2005
It is now well established that a large fraction of the low-mass stars are binaries or higher order multiples. Similarly a sizable fraction have giant planets.
A. P. Hatzes, Abt, B. Macintosh, Boesgaard, Burrows, Cayrel, Chabrier, Chauvin, Chauvin, Close, Cochran, D. B. Paulson, Dahn, Duquennoy, E. W. Guenther, Endl, Fischer, Freed, Ghez, Goto, Guenther, Guenther, Henry, J. Patience, Kirkpatrick, Lebreton, Lineweaver, Liu, Lowrance, Lowrance, Malkov, Martín, Martín, Masciadri, Masciadri, Mazeh, Mazeh, McCarthy, McCaughrean, Nakajima, Neuhäuser, Neuhäuser, Neuhäuser, Neuhäuser, Patience, Paulson, Paulson, Paulson, Perryman, Potter, Reid, Santos, Seifahrt, Stern, Tinney, Torres, Udry, W. D. Cochran, Wuchterl, Zapatero Osorio, Zucker   +60 more
core   +1 more source

The Rotational Evolution of Young, Binary M Dwarfs [PDF]

, 2018
We have analysed K2 light curves for more than 3,000 low mass stars in the $\sim$8 Myr old Upper Sco association, the $\sim$125 Myr age Pleiades open cluster and the $\sim$700 Myr old Hyades and Praesepe open clusters to determine stellar rotation rates.
Barrado, David, Bouvier, Jerome, Cody, Ann Marie, David, Trevor, Hillenbrand, Lynne, Pinsonneault, Marc, Rebull, Luisa, Stauffer, John   +7 more
core   +5 more sources

X-shooter observations of low-mass stars in the η Chamaeleontis association [PDF]

, 2017
The nearby η Chamaeleontis association is a collection of 4–10 Myr old stars with a disk fraction of 35–45%. In this study, the broad wavelength coverage of VLT/X-shooter is used to measure the stellar and mass accretion properties of 15 low-mass stars ...
M. Rugel, D. Fedele, G. Herczeg
semanticscholar   +1 more source

X-ray observations of eight young open star clusters : I. Membership and X-ray Luminosity

, 2013
We present a detailed investigation of X-ray source contents of eight young open clusters with ages between 4 to 46 Myr using archival X-ray data from XMM-Newton. The probable cluster memberships of the X-ray sources have been established on the basis of
Bhatt, Himali, Kumar, Brijesh, Pandey, J. C., Sagar, Ram, Singh, K. P.   +4 more
core   +1 more source

Evidence for a constant IMF in early-type galaxies based on their X-ray binary populations [PDF]

, 2014
A number of recent studies have proposed that the stellar initial mass function (IMF) of early type galaxies varies systematically as a function of galaxy mass, with higher mass galaxies having bottom heavy IMFs.
Gonzalez, Anthony H., Kundu, Arunav, Lehmer, Bret D., Maccarone, Thomas J., Maraston, Claudia, Peacock, Mark B., Zepf, Stephen E.   +6 more
core   +2 more sources

Dynamical Masses of Low-mass Stars in the Taurus and Ophiuchus Star-forming Regions [PDF]

, 2017
We report new dynamical masses for five pre-main sequence (PMS) stars in the L1495 region of the Taurus star-forming region (SFR) and six in the L1688 region of the Ophiuchus SFR.
M. Simon, S. Guilloteau, E. D. Folco, A. Dutrey, N. Grosso, V. Piétu, E. Chapillon, L. Prato, G. Schaefer, E. Rice, Y. Boehler   +10 more
semanticscholar   +1 more source

Chemical abundances of stars with brown-dwarf companions

, 2014
It is well-known that stars with giant planets are on average more metal-rich than stars without giant planets, whereas stars with detected low-mass planets do not need to be metal-rich.
Hernández, J. I. González, Israelian, G., Sahlmann, J., Santos, N. C., Sánchez, D. Mata, Udry, S.   +5 more
core   +1 more source

Measuring the extent of convective cores in low-mass stars using Kepler data: towards a calibration of core overshooting [PDF]

, 2016
Our poor understanding of the boundaries of convective cores generates large uncertainties on the extent of these cores and thus on stellar ages. Our aim is to use asteroseismology to consistently measure the extent of convective cores in a sample of ...
S. Deheuvels, S. Deheuvels, I. Brandao, V. S. Aguirre, J. Ballot, J. Ballot, Eric Michel, M. Cunha, Yveline Lebreton, Yveline Lebreton, T. Appourchaux   +10 more
semanticscholar   +1 more source

Coronal Structure of Low-Mass Stars

, 2012
We investigate the change in stellar magnetic topology across the fully-convective boundary and its effects on coronal properties. We consider both the magnitude of the open flux that influences angular momentum loss in the stellar wind and X-ray ...
Aline Vidotto, Altschuler, Barbera, Berger, Berger, Berger, Berger, Berger, Burgasser, Chabrier, Delfosse, Donati, Donati, Donati, Donati, Donati, Fleming, Giampapa, Gilliland, Golub, Gregory, Guedel, Güdel, Hallinan, Hallinan, Hussain, Hussain, Irwin, Jardine, Jardine, Jean-François Donati, Jeffries, Johns-Krull, Julien Morin, Kim, Kiraga, Kitchatinov, Mangeney, Marilli, McLean, Melrose, Moira Jardine, Morin, Morin, Morin, Ness, Ness, Patten, Pauline Lang, Pizzolato, Reiners, Reiners, Rosner, Saar, Sanderson, Schatten, Schmitt, Scholz, Skumanich, Spiegel, Stauffer, Stauffer, Stȩpień, van Ballegooijen, Vidotto, Vilhu, Vilhu, Weber   +67 more
core   +1 more source