Results 241 to 250 of about 130,291 (292)

An ultra-short-period super-Earth with an extremely high density and an outer companion. [PDF]

open access: yesSci Rep
Livingston JH   +20 more
europepmc   +1 more source

First-in-Human Biodistribution and Dosimetry of [<sup>11</sup>C]Trimethoprim. [PDF]

open access: yesMol Imaging Biol
Young AJ   +13 more
europepmc   +1 more source

Neutron capture measurements for s-process nucleosynthesis: A review about CERN n_TOF developments and contributions. [PDF]

open access: yesEur Phys J A Hadron Nucl
Domingo-Pardo C   +145 more
europepmc   +1 more source

Accreting White Dwarfs: An Unreview. [PDF]

open access: yesSpace Sci Rev
Scaringi S, Knigge C, de Martino D.
europepmc   +1 more source

Stellar activity cycles

Annual Review of Astronomy and Astrophysics, 1985
The variety of stellar chromospheric and coronal activity provides a framework for understanding solar and stellar magnetic activity. It is pointed out that the recognition of an 11-yr periodicity within the record of sunspot numbers is a relatively recent discovery of just over a century ago.
Sallie L. Baliunas, Arthur H. Vaughan
openaire   +2 more sources

On stellar activity cycles

Astrophysics and Space Science, 1972
The relation between the average magnetic fieldB, the angular velocity Ω, and the periodP of stellar activity cycles is studied. For the calculations we have used Leighton's (1969) model for the solar cycle with the additional assumption that the differential rotation and the cyclonic turbulence (Parker, 1955) (that is the ‘sunspot tilt’ or the ‘α ...
B. R. Durney, J. O. Stenflo
openaire   +1 more source

Stellar coronal activity

Advances in Space Research, 2000
Abstract I review recent results on coronal activity in late-type stars stressing the similarities and differences with respect to solar coronal activity. The emphasis is on recent stellar observations by ROSAT, ASCA and SAX and on prospects for future observations by AXAF and XMM.
openaire   +1 more source

Changing stellar activity cycles

Astronomische Nachrichten, 2007
AbstractWe investigated continuous long‐term photometric datasets of thirteen active stars, Ca II variability of one single mainsequence star, and 10.7 cm radio data of the Sun, with simple Fourier‐ and time‐frequency analysis. The data reflect the strength of the activity manifested in magnetic spots. All studied stars show multiple (2 to 4) cycles of
K. Oláh   +4 more
openaire   +1 more source

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