Results 21 to 30 of about 130,683 (338)

Magnetic activities of two contact binaries in quadruple stellar systems. [PDF]

Sci Rep
Yang Y, Wang S.
europepmc   +3 more sources

Hot Jupiters and stellar magnetic activity [PDF]

, 2008
Recent observations suggest that stellar magnetic activity may be influenced by the presence of a close-by giant planet. Specifically, chromospheric hot spots rotating in phase with the planet orbital motion have been observed during some seasons in a ...
A. F. Lanza, Acheson, Berger, Bigazzi, Blackman, Brandenburg, Brandenburg, Catala, Chandrasekhar, Chandrasekhar, Cuntz, Donati, Flyer, Harvey, Henry, Ip, McIvor, Moss, Moutou, Neukirch, Preusse, Rubenstein, Santos, Schrijver, Shkolnik, Shkolnik, Walker, Walker, Wieglmann   +28 more
core   +2 more sources

Stellar Parameters and Spectroscopic Properties of TESS Objects Observed in the LAMOST Low- and Medium-resolution Spectral Survey

The Astrophysical Journal Supplement Series, 2022
Stellar parameters and magnetic activity are important for the understanding of stellar physics and dynamo theory. We have used LAMOST spectroscopic surveys to study stellar parameters and magnetic activity properties of TESS objects.
Li-yun Zhang, Tianhao Su, Prabhakar Misra, Xianming L. Han, Gang Meng, Qingfeng Pi, Jiawei Yang   +6 more
doaj   +1 more source

Is it possible to detect planets around young active G and K dwarfs? [PDF]

, 2013
Theoretical predictions suggest that the distribution of planets in very young stars could be very different to that typically observed in Gyr old systems that are the current focus of radial velocity surveys.
A. Reiners, Baliunas, Baraffe, Barnes, Bogdan, Bouvier, Bouvier, Brandt, Chatterjee, Claret, Collier Cameron, Covey, D. J. Pinfield, Donati, Dravins, Dravins, Fontenla, Ford, Gray, Gray, Gray, Gu, H. R. A. Jones, Hernán-Obispo, Ida, Innis, Irwin, J. R. Barnes, Jeffers, Jeffers, Jeffers, Jurić, Kupka, Kupka, Lockwood, Marsden, Marsden, Meunier, Meunier, Moulds, O'Neal, O'Neal, Perryman, Piskunov, Press, Quirrenbach, Radick, Reiners, Reiners, Ryabchikova, S. C. Marsden, S. V. Jeffers, Saar, Saar, Sandquist, Soderblom, Solanki, Strassmeier, Sánchez Cuberes, Unruh, Wright, Wright   +61 more
core   +4 more sources

The Direct Effect of Toroidal Magnetic Fields on Stellar Oscillations: An Analytical Expression for the General Matrix Element [PDF]

, 2017
Where is the solar dynamo located and what is its modus operandi? These are still open questions in solar physics. Helio- and asteroseismology can help answer them by enabling us to study solar and stellar internal structures through global oscillations.
Kiefer, René, Roth, Markus, Schad, Ariane   +2 more
core   +2 more sources

The place of the Sun among the Sun-like stars [PDF]

, 2013
Context. Monitoring of the photometric and chromospheric HK emission data series of stars similar to the Sun in age and average activity level showed that there is an empirical correlation between the average stellar chromospheric activity level and the ...
Cessateur, G., Rozanov, E., Schmutz, W., Shapiro, A. I.   +3 more
core   +1 more source

Stellar activity and transits

, 2021
From an observational standpoint, stellar activity poses a critical challenge to exoplanet science, as it inhibits the detection of planets and the precise measurement of their parameters. Radial velocity and transit searches revealed a significant fraction of exoplanet hosts is active, and showed the need to fully understand the different facets of ...
Bruno, Giovanni, Deleuil, Magali
openaire   +2 more sources

Seismic Signatures of Stellar Magnetic Activity—What Can We Expect From TESS?

Frontiers in Astronomy and Space Sciences, 2019
Asteroseismic methods offer a means to investigate stellar activity and activity cycles as well as to identify those properties of stars which are crucial for the operation of stellar dynamos.
René Kiefer, Anne-Marie Broomhall, Warrick H. Ball, Warrick H. Ball   +3 more
doaj   +1 more source

What turns galaxies off? The different morphologies of star-forming and quiescent galaxies since z~2 from CANDELS [PDF]

, 2011
We use HST/WFC3 imaging from the CANDELS Multicycle Treasury Survey, in conjunction with the Sloan Digital Sky Survey, to explore the evolution of galactic structure for galaxies with stellar masses >3e10M_sun from z=2.2 to the present epoch, a time span
Abazajian, Aday R. Robaina, Anton Koekemoer, Arjen van der Wel, Avishai Dekel, Baugh, Bell, Bell, Bell, Bell, Bell, Benson, Bezanson, Blanton, Blanton, Brammer, Brammer, Brown, Bundy, Bundy, Cameron, Casey Papovich, Cassata, Cheung, Christina C. Williams, Christopher J. Conselice, Dale Kocevski, Daniel H. McIntosh, David C. Koo, Davis, Dekel, Donley, Drory, Duilia de Mello, Edmond Cheung, Elizabeth J. McGrath, Eric F. Bell, Faber, Fioc, Franx, Furusawa, Graham, Grogin, Győry, Gültekin, Hans-Walter Rix, Harry Ferguson, Hoffman, Hopkins, Hopkins, Häring, Häussler, Häußler, Ilbert, James S. Dunlop, Jennifer Lotz, Jessica Herrington, Jeyhan Kartaltepe, Johansson, Kannappan, Karim, Kartaltepe, Khochfar, Koekemoer, Kriek, Kriek, Kriek, Lee, Lupton, Magorrian, Martig, Mauro Giavalisco, McGrath, Moster, Naab, Noeske, Norman Grogin, Pannella, Papovich, Papovich, Papovich, Patel, Peng, Peng, Peng, Peng, Prochaska, Rix, Robaina, Ruhland, S. M. Faber, Salim, Salim, Schlegel, Scoville, Simard, Skrutskie, Somerville, Springel, Stijn Wuyts, Stockton, Strateva, Szomoru, Sérsic, Tal, Taylor, Taylor, Tremonti, Tremonti, van den Bergh, van der Wel, van der Wel, van der Wel, van der Wel, van Dokkum, van Dokkum, Wake, Wake, Weinmann, Whitaker, Whitaker, Williams, Williams, Wuyts, Wuyts, Wuyts, Wuyts, Wuyts, Yang, Yi, Zheng   +130 more
core   +5 more sources

Stellar populations in active galaxies [PDF]

Proceedings of the International Astronomical Union, 2004
To appear in "The Interplay among Black Holes, Stars and ISM in Galactic Nuclei", T. Storchi Bergmann, L.C. Ho & H.R. Schmitt, eds., Proc IAU Symp 222 (Cambridge University Press)
openaire   +2 more sources