Results 21 to 30 of about 116,321 (322)

The Effect of Stellar Rotation on Colour-Magnitude Diagrams: On the apparent presence of multiple populations in intermediate age stellar clusters

, 2009
A significant number of intermediate age clusters (1-2 Gyr) in the Magellanic Clouds appear to have multiple stellar populations within them, derived from bi-modal or extended main sequence turn offs. If this is interpreted as an age spread, the multiple
Bekki, Boesgaard, Cardini, Charbonnel, Collins, D'Ercole, D'Souza, De Mink, Donati, Eldridge, Faulkner, Fossati, Gaige, Glatt, Goudfrooij, Gray, Heger, Huang, Huang, Hunter, Mackey, Mackey, Massey, Mestel, Meynet, Milone, N. Bastian, Palacios, Pietrinferni, Piotto, Pérez Hernández, Royer, S. E. de Mink, Salpeter, Schatzman, Talon, Townsend, von Zeipel, Westera, Yoon   +39 more
core   +1 more source

Observable Signatures of Classical T Tauri Stars Accreting in an Unstable Regime

EPJ Web of Conferences, 2014
We discuss key observational signatures of Classical T Tauri stars (CTTSs) accreting through Rayleigh-Taylor instability, which occurs at the interface between an accretion disk and a stellar magnetosphere.
Kurosawa Ryuichi, Romanova M. M.
doaj   +1 more source

The Factory and The Beehive I. Rotation Periods For Low-Mass Stars in Praesepe [PDF]

, 2011
Stellar rotation periods measured from single-age populations are critical for investigating how stellar angular momentum content evolves over time, how that evolution depends on mass, and how rotation influences the stellar dynamo and the magnetically ...
Adam Kraus, Baraffe, Barnes, Barnes, Barnes, Barnes, Browning, Covey, Covey, Delfosse, Dotter, Dovi Poznanski, Efron, Eran O. Ofek, Feigelson, Giampapa, Irwin, Irwin, Jenna J. Lemonias, Joshua S. Bloom, Kevin R. Covey, Kiraga, Kraus, Krishnamurthi, Law, Mamajek, Mansi M. Kasliwal, Marcel A. Agüeros, Meibom, Meibom, Monet, Natasha Batalha, Nicholas M. Law, Peter E. Nugent, Robert M. Quimby, S. Bradley Cenko, Shrinivas R. Kulkarni, Skrutskie, Soderblom, Stauffer, Steele, Stoughton, Terndrup, West, York   +44 more
core   +2 more sources

Implications of the generation of internal gravity waves by penetrative convection for the internal rotation evolution of low-mass stars

EPJ Web of Conferences, 2017
Due to the space-borne missions CoRoT and Kepler, noteworthy breakthroughs have been made in our understanding of stellar evolution, and in particular about the angular momentum redistribution in stellar interiors. Indeed, the high-precision seismic data
Pinçon Charly, Belkacem Kévin, Goupil Marie-Jo   +2 more
doaj   +1 more source

Stellar Rotation and Mixing [PDF]

Symposium - International Astronomical Union, 1997
Many observations indicate that some mixing occurs in stellar radiation zones: in massive stars, chemical elements resulting from nuclear burning in the core are detected at the surface, and in solar-type stars lithium is depleted with age. Since all mixing processes transport also momentum, the depletion of lithium should be linked with the loss of ...
openaire   +1 more source

The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period [PDF]

, 2019
peer reviewedWe report six stellar occultations by Phoebe (Saturn IX), an irregular satellite of Saturn, obtained between mid-2017 and mid-2019. The 2017 July 6 event was the first stellar occultation by an irregular satellite ever observed.
Assafin, Marcelo, Barry, T., Benedetti-Rossi, Gustavo, Braga-Ribas, Felipe, Camargo, J. I. B., Campbell-White, J., De Horta, A., Desmars, Josselin, Fernández-Lajús, E., Giles, D., Gomes-Júnior, A. Ramos, Hanna, W., Hayamizu, T., Hirose, T., Horvat, R., Hosoi, K., Jehin, Emmanuel, Kerr, S., Machado, D. I., Mammana, L. A., Maybour, D., Morgado, Bruno Eduardo, Owada, M., Rahvar, S., Sicardy, B., Snodgrass, C., Vieira-Martins, R.   +26 more
core   +5 more sources

Polar branches of stellar activity waves: dynamo models and observations

, 2011
[Abridged abstract:] Stellar activity data provide evidence of activity wave branches propagating polewards rather than equatorwards (the solar case). Stellar dynamo theory allows polewards propagating dynamo waves for certain governing parameters.
A. F. Lanza, Baliunas, Baliunas, Barnes, Berdyugina, Brandenburg, Brandenburg, Brandenburg, Brandenburg, Brandenburg, Charbonneau, Choudhuri, Courvoisier, Covas, D. Moss, D. Sokoloff, Dikpati, Dikpati, Dikpati, Donahue, Durney, Granzer, Hall, Holzwarth, Işik, Jeffers, Jouve, Järvinen, Katsova, Kleeorin, Kovári, Käpylä, Lanza, Lanza, Mackay, Makarov, Messina, Moss, Moss, Moss, Moss, Moss, Noyes, Noyes, Oláh, Ossendrijver, Rüdiger, Rüdiger, Rüdiger, Schmitt, Schrijver, Strassmeier, Subramanian, Tobias, Vogt, Wilmot-Smith, Zhang   +56 more
core   +1 more source

The role and implications of mammalian cellular circadian entrainment

FEBS Letters, EarlyView.
At their most fundamental level, mammalian circadian rhythms occur inside every individual cell. To tell the correct time, cells must align (or ‘entrain’) their circadian rhythm to the external environment. In this review, we highlight how cells entrain to the major circadian cues of light, feeding and temperature, and the implications this has for our
Priya Crosby
wiley   +1 more source

Disk-locking Regulates Stellar Rotation in Young Clusters: Insights from NGC 2264

The Astrophysical Journal
Many young clusters possess extended main sequences, a phenomenon commonly ascribed to stellar rotation. However, the mechanism behind their very wide stellar rotation distributions remains unclear.
Yutian Bu, Chenyu He, Min Fang, Chengyuan Li   +3 more
doaj   +1 more source

Learning about the latitudinal distribution of starspots through the periodogram analysis of photometric data

EPJ Web of Conferences, 2017
Starspots are cooler and darker than the stellar surface. Therefore, the emitted flux of a star changes when spots are visible on its surface. The presence of spots together with the stellar rotation leads to a periodic modulation on the light curve.
Santos Ângela R. G., Cunha Margarida S., Avelino Pedro P., García Rafael A., Mathur Savita   +4 more
doaj   +1 more source