Results 21 to 30 of about 112,697 (340)

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

Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis

The Astronomical Journal, 2023
The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M _⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and surface differential rotation very similar to the Sun.
Travis S. Metcalfe, Derek Buzasi, Daniel Huber, Marc H. Pinsonneault, Jennifer L. van Saders, Thomas R. Ayres, Sarbani Basu, Jeremy J. Drake, Ricky Egeland, Oleg Kochukhov, Pascal Petit, Steven H. Saar, Victor See, Keivan G. Stassun, Yaguang Li, Timothy R. Bedding, Sylvain N. Breton, Adam J. Finley, Rafael A. García, Hans Kjeldsen, Martin B. Nielsen, J. M. Joel Ong, Jakob L. Rørsted, Amalie Stokholm, Mark L. Winther, Catherine A. Clark, Diego Godoy-Rivera, Ilya V. Ilyin, Klaus G. Strassmeier, Sandra V. Jeffers, Stephen C. Marsden, Aline A. Vidotto, Sallie Baliunas, Willie Soon   +33 more
doaj   +1 more source

Stellar multiplicity and stellar rotation: insights from APOGEE

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACTWe measure rotational broadening in spectra taken by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey to characterize the relationship between stellar multiplicity and rotation. We create a sample of 2786 giants and 24 496 dwarfs with stellar parameters and multiple radial velocities from the APOGEE pipeline, projected
Christine Mazzola Daher, Carles Badenes, Jamie Tayar, Marc Pinsonneault, Sergey E Koposov, Kaitlin Kratter, Maxwell Moe, Borja Anguiano, Diego Godoy-Rivera, Steven Majewski, Joleen K Carlberg, Matthew G Walker, Rachel Buttry, Don Dixon, Javier Serna, Keivan G Stassun, Nathan De Lee, Jesús Hernández, Christian Nitschelm, Guy S Stringfellow, Nicholas W Troup   +20 more
openaire   +3 more sources

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 Effects of Stellar Rotation. I. Impact on the Ionizing Spectra and Integrated Properties of Stellar Populations

, 2012
We present a sample of synthetic massive stellar populations created using the Starburst99 evolutionary synthesis code and new sets of stellar evolutionary tracks, including one set that adopts a detailed treatment of rotation.
Bressan, Cerviño, Cid Fernandes, Claus Leitherer, da Silva, Daniel Schaerer, de Mink, Dopita, Drout, Emily M. Levesque, Fumagalli, Georges Meynet, Georgy, González Delgado, González Delgado, Groves, Hillier, Huang, Izotov, Kewley, Kewley, Kobulnicky, Kobulnicky, Leitherer, Leitherer, Leitherer, Leitherer, Levesque, Levesque, Levesque, Maeder, Massey, Massey, Massey, Meynet, Neugent, Rix, Salasnich, Schaller, Shull, Snijders, Sylvia Ekstrom, Tremonti, Vázquez, Vázquez, Wolff, Zahn   +46 more
core   +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

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

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

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 carboxylate “gripper” of the substrate is critical for C‐4 stereo‐inversion by UDP‐glucuronic acid 4‐epimerase

FEBS Letters, EarlyView.
UDP‐glucuronic acid 4‐epimerase (UGAepi) catalyzes NAD+‐dependent interconversion of UDP‐glucuronic acid (UDP‐GlcA) and UDP‐galacturonic acid (UDP‐GalA) via C4‐oxidation, 4‐keto‐intermediate rotation, and C4‐reduction. Here, Borg et al. examined the role of the substrate's carboxylate group in the enzymic mechanism by analyzing NADH‐dependent reduction
Annika J. E. Borg, Laura De Cnop, Bernd Nidetzky   +2 more
wiley   +1 more source