Results 31 to 40 of about 753 (61)

An extragalactic supernebula confined by gravity

, 2003
Little is known about the origins of the giant star clusters known as globular clusters. How can hundreds of thousands of stars form simultaneously in a volume only a few light years across the distance of the sun to its nearest neighbor?
AFM Moorwood, BY Mills, CA Tremonti, CC Steidel, CG De Pree, CL Martin, D Calzetti, D Kunth, D. S. Meier, DL Meier, DOS Wood, DS Meier, G Tenorio-Tagle, GH Rieke, I. S. McLean, IS McLean, J Melnick, J. E. Larkin, J. L. Turner, JL Turner, JL Turner, JR Walsh, K Kawara, L Hartmann, L. P. Crosthwaite, N Caldwell, NR Mohan, NR Walborn, PJ Storey, RC Kennicutt Jr, S. C. Beck, SC Beck, V Gorjian, V Gorjian   +33 more
core   +1 more source

Wavelets: a powerful tool for studying rotation, activity, and pulsation in Kepler and CoRoT stellar light curves [PDF]

, 2014
Aims. The wavelet transform has been used as a powerful tool for treating several problems in astrophysics. In this work, we show that the time-frequency analysis of stellar light curves using the wavelet transform is a practical tool for identifying ...
Bravo, J. P., De Medeiros, J. R., Estrela, R., Leão, I. C., Roque, S.   +4 more
core   +1 more source

Pulsational frequency and amplitude modulation in the δ Sct star KIC 7106205 [PDF]

, 2014
Analysis of the Kepler δ Sct star KIC 7106205 showed amplitude modulation in a single pressure mode, whilst all other pressure and gravity modes remained stable in amplitude and phase over the 1470 d length of the data set.
Bowman, Dominic, Kurtz, Donald Wayne
core   +2 more sources

A Volume-Limited Photometric Survey of 114 gamma Doradus Candidates

, 2011
We have carried out a photometric survey of a complete, volume-limited sample of gamma Doradus candidates. The sample was extracted from the Hipparcos catalog and consists of 114 stars with colors and absolute magnitudes within the range of known gamma ...
Fekel, Francis C., Henry, Gregory W., Henry, Stephen M.   +2 more
core   +1 more source

Inferring coronal structure from X-ray lightcurves and Doppler shifts: a Chandra study of AB Doradus

, 2004
The Chandra X-ray observatory monitored the single cool star, AB Doradus, continuously for a period lasting 88 ksec (1.98 Prot) in 2002 December with the LETG/HRC-S.
A. A. van Ballegooijen, A. Collier Cameron, A. K. Dupree, Collier Cameron A., F. Favata, Favata F., Favata F., G. A. J. Hussain, Innis J. L., J.‐F. Donati, Kurster M., M. M. Jardine, Maggio A., N. S. Brickhouse, R. Hoogerwerf, Solanki S. K., Unruh Y. C.   +16 more
core   +2 more sources

Instabilities in the Envelopes and Winds of Very Massive Stars

, 2014
The high luminosity of Very Massive Stars (VMS) means that radiative forces play an important, dynamical role both in the structure and stability of their stellar envelope, and in driving strong stellar-wind mass loss.
A. A. Belyanin, A. Feldmeier, A. Feldmeier, A. J. Marle van, A. Pauldrach, A. S. Eddington, A. W. Fullerton, C. A. Iglesias, C. D. Levermore, C. F. Gammie, D. F. Figer, D. H. Cohen, E. A. Spiegel, E. A. Spiegel, E. A. Spiegel, E. T. Vishniac, G. C. Pomraning, J. Arons, J. C. B. Papaloizou, J. I. Castor, J. O. Sundqvist, J. O. Sundqvist, J. Petrovic, K. B. MacGregor, K. G. Gayley, L. B. Lucy, L. B. Lucy, L. Dessart, L. M. Oskinova, M. C. Begelman, M. C. Runacres, M. S. Oey, N. Grevesse, N. J. Shaviv, N. J. Shaviv, N. J. Shaviv, N. Smith, N. Smith, N. Smith, O. Blaes, P. A. Crowther, P. C. Joss, R. Kippenhahn, R. P. Kudritzki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, S. P. Owocki, T. Quinn, V. V. Sobolev, W. Glatzel, W. Glatzel   +53 more
core   +1 more source

Limits from the Hubble Space Telescope on a Point Source in SN 1987A

, 2005
We observed supernova 1987A (SN 1987A) with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST) in 1999 September, and again with the Advanced Camera for Surveys (ACS) on the HST in 2003 November.
Alexei V. Filippenko, Arlin Crotts, Bath G. T., Blandford R. D., Bouchet P., Brian P. Schmidt, Chun J. S. Pun, Claes Fransson, de Loore C., Genevieve J. M. Graves, George Sonneborn, Howarth I. D., Illarionov A. F., J. Craig Wheeler, Jaroszynski M., Lifan Wang, Mark M. Phillips, Mignani R. P., Nicholas B. Suntzeff, Nino Panagia, Peter Garnavich, Peter Lundqvist, Peter M. Challis, Richard McCray, Robert P. Kirshner, Roger A. Chevalier, Sanduleak N., Shakura N. I., Soderberg A. M., Weidong Li, West R. M., Winkler P. F., Zavlin V. E.   +32 more
core   +1 more source

Metallicity dependence of turbulent pressure and macroturbulence in stellar envelopes

, 2016
Macroturbulence, introduced as a fudge to reproduce the width and shape of stellar absorption lines, reflects gas motions in stellar atmospheres. While in cool stars, it is thought to be caused by convection zones immediately beneath the stellar surface,
Castro, Norberto, Fossati, Luca, Grassitelli, Luca, Langer, Norbert, Sanyal, Debashis, Simon-Diaz, Sergio   +5 more
core   +1 more source

Asteroseismology

, 2012
Asteroseismology is the determination of the interior structures of stars by using their oscillations as seismic waves. Simple explanations of the astrophysical background and some basic theoretical considerations needed in this rapidly evolving field ...
A Baglin, A Gautschy, A Miglio, A Mukadam, AA Pamyatnykh, AB Kaye, AJ Brickhill, AU Landolt, B Mosser, C Aerts, C Aerts, C Waelkens, C Waelkens, D Kilkenny, DE Mkrtichian, DE Winget, DE Winget, DE Winget, DE Winget, DO Gough, DR Reese, DW Kurtz, DW Kurtz, DW Kurtz, EB Frost, EL Robinson, EM Green, F-L Deubner, G Handler, G Handler, G Handler, G Handler, G Maeder, G Torres, G Walker, H Bruntt, H Kjeldsen, H Saio, J Christensen-Dalsgaard, J Christensen-Dalsgaard, J Daszyńska-Daszkiewicz, J Daszyńska-Daszkiewicz, J Daszyńska-Daszkiewicz, J Goodricke, J Ridder De, J-P Montagner, JH Telting, JH Telting, JP Cox, JR Percy, L Eyer, LL Kiss, M Aizenman, M Asplund, M Suran, M Tassoul, M-A Dupret, MD Reed, MH Montgomery, MH Montgomery, N Baker, P Brassard, P Dufour, PA Woudt, PW Jones, R Samadi, RD Watson, RE Nather, RE Nather, RL Gilliland, S Frandsen, S Hekker, S Rosseland, S Talon, SO Kepler, SS Vogt, T Kallinger, TR Bedding, TR Bedding, TS Metcalfe, TS Metcalfe, WA Dziembowski, WA Dziembowski, WA Dziembowski, WA Dziembowski, WD Pesnell, WJ Chaplin, WW Campbell   +87 more
core   +1 more source

Chandra observations of the HII complex G5.89-0.39 and TeV gamma-ray source HESSJ1800-240B

, 2016
We present the results of our investigation, using a Chandra X-ray observation, into the stellar population of the massive star formation region G5.89-0.39, and its potential connection to the coincident TeV gamma-ray source HESSJ1800-240B.
Hampton, E. J., Hofmann, W., Horns, D., Rowell, G., Uchiyama, Y., Wagner, S.   +5 more
core   +1 more source