Results 11 to 20 of about 116,321 (322)

The stellar activity‐rotation relationship [PDF]

Astronomische Nachrichten, 2013
AbstractUsing a new catalog of 824 solar and late‐type stars with measured X‐ray luminosities and rotation periods we have studied the relationship between rotation and stellar activity that is believed to be a probe of the underlying stellar dynamo. Using an unbiased subset of the sample we calculate the power law slope of the unsaturated regime of ...
Wright, Nicholas J., Drake, Jeremy J., Mamajek, Eric E., Henry, Gregory W.   +3 more
openaire   +6 more sources

Effects of thermohaline instability and rotation-induced mixing on the evolution of light elements in the Galaxy : D, 3He and 4He [PDF]

, 2012
Recent studies of low- and intermediate-mass stars show that the evolution of the chemical elements in these stars is very different from that proposed by standard stellar models.
Asplund, Balser, Balser, Balser, Bania, Bennett, Boothroyd, Burles, C. Charbonnel, C. Chiappini, Charbonnel, Charbonnel, Charbonnel, Charbonnel, Charbonnel, Chiappini, Chiappini, Chiappini, Coc, Costa, Cyburt, D. Romano, Dearborn, Denissenkov, Denissenkov, Edmunds, Eggleton, Eggleton, Ekström, Epstein, F. Matteucci, Frogel, Galli, Galli, Geiss, Geiss, Geiss, Gloeckler, Grevesse, Groenewegen, Hirschi, Hirschi, Hogan, Hébrard, Hébrard, Iben, Iwamoto, Jenkins, Kobayashi, Krishnamurti, Lagarde, Larson, Linsky, M. Tosi, Maeder, Marigo, Matteucci, Meynet, N. Lagarde, Oliveira, Palla, Peebles, Pettini, Prantzos, Prodanović, Prodanović, Reeves, Rogers, Romano, Romano, Romano, Rood, Rood, Rood, Rosenblum, Serenelli, Songaila, Sonneborn, Spergel, Steigman, Steigman, Tosi, Traxler, Truran, Ulrich, Vidal-Madjar, Wagoner, Weiss, Zahn   +88 more
core   +2 more sources

CALIFA reveals Prolate Rotation in Massive Early-type Galaxies: A Polar Galaxy Merger Origin? [PDF]

, 2017
We present new evidence for eight early-type galaxies (ETGs) from the CALIFA Survey that show clear rotation around their major photometric axis ("prolate rotation").
Aguerri, J. Alfonso L., Chang, Jiang, Falcón-Barroso, Jesús, Lyubenova, Mariya, Macciò, Andrea V., Tsatsi, Athanasia, van de Ven, Glenn   +6 more
core   +3 more sources

The Rotation Period of the Planet-Hosting Star HD 189733 [PDF]

, 2007
We present synoptic optical photometry of HD 189733, the chromospherically active parent star of one of the most intensively studied exoplanets. We have significantly extended the timespan of our previously reported observations and refined the estimate ...
Chatterjee S., Eaton J. A., Fabrycky D. & Tremaine S., Fabrycky D. C., Gregory W. Henry, Joshua N. Winn, Pont F., Tinetti G.   +7 more
core   +3 more sources

The evolution of single B-type stars with a large angular momentum content [PDF]

, 2014
The database of intermediate mass rotating stellar models presented in the past years by the Geneva Stellar Evolution Group can be used to build synthetic stellar populations that fully account for the effects of stellar rotation.
Granada, Anahí, Haemmerlé, Lionel
core   +1 more source

Towards age/rotation/magnetic activity relation with seismology

EPJ Web of Conferences, 2015
The knowledge of stellar ages directly impacts the characterization of a planetary system as it puts strong constraints on the moment when the system was born. Unfortunately, the determination of precise stellar ages is a very difficult task.
Mathur Savita
doaj   +1 more source

Measurement of the Angular Momenta of Pre-main-sequence Stars: Early Evolution of Slow and Fast Rotators and Empirical Constraints on Spin-down Torque Mechanisms

The Astronomical Journal, 2023
We use TESS full-frame imaging data to investigate the angular momentum evolution of young stars in the Orion Complex. We confirm recent findings that stars with rotation periods faster than 2 days are overwhelmingly binaries, with typical separations of
Marina Kounkel, Keivan G. Stassun, Lynne A. Hillenbrand, Jesús Hernández, Javier Serna, Jason Lee Curtis   +5 more
doaj   +1 more source

Rotation periods of exoplanet host stars [PDF]

, 2010
The stellar rotation periods of ten exoplanet host stars have been determined using newly analysed Ca II H & K flux records from Mount Wilson Observatory and Stromgren b, y photometric measurements from Tennessee State University's automatic photometric ...
Baliunas, Baliunas, Barnes, Benedict, Butler, Butler, C. A. Watson, Catala, Collier Cameron, Collier Cameron, Collier Cameron, Cox, Croll, Donahue, Donahue, Donati, E. K. Simpson, Fischer, Fischer, Fischer, Frick, G. W. Henry, Greaves, Greaves, Hale, Henry, Henry, Henry, Henry, Henry, Henry, Henry, Horne, Korzennik, Kozai, Lin, Lovis, Mayor, Mayor, McArthur, McLaughlin, Nagasawa, Narita, Noyes, Paulson, Prato, Queloz, Queloz, Rasio, Rossiter, S. L. Baliunas, Saar, Scargle, Shkolnik, Shkolnik, Takeda, Triaud, Udry, Valenti, Vogt, Walker, Watson, Weidenschilling, Winn, Winn, Wright, Wright, Wu   +67 more
core   +3 more sources

Supernovae from rotating stars

, 2017
The present paper discusses the main physical effects produced by stellar rotation on presupernovae, as well as observations which confirm these effects and their consequences for presupernova models.
A Gal-Yam, A Heger, A Heger, A Maeder, A Maeder, A Maeder, A Maeder, A Stacy, AFJ Moffat, AV Filippenko, C Chiappini, C Chiappini, C Georgy, C Martayan, F Martins, G Meynet, G Meynet, G Meynet, G Meynet, G Meynet, G Piotto, H Zeipel Von, I Mandel, J-P Zahn, JH Groh, JH Groh, JH Groh, JJ Eldridge, JS Vink, MC Bersten, MR Drout, N Przybilla, N Smith, N Yusof, O Krause, P Marchant, PA Crowther, R Hirschi, R Hirschi, R Hirschi, RM Humphreys, S Ekström, S Ekström, S-C Yoon, SE Woosley, SE Woosley, SE Woosley, SJ Smartt, SJ Smartt, T Karlsson, T Moriya, T Yoshida, Y Cao   +52 more
core   +1 more source

Determination of the position angle of stellar spin axes [PDF]

, 2014
Measuring the stellar position angle provides valuable information on binary stellar formation or stellar spin axis evolution. We aim to develop a method for determining the absolute stellar position angle using spectro-astrometric analysis of high ...
Lesage, Anna-Lea, Wiedemann, Guenter
core   +3 more sources