Stellar Activity and Rotation
Constraining stellar physics from red-giant stars in binaries – stellar rotation, mixing processes and stellar activity
... of stellar structure and evolution - in particular for solar-like oscillators in this ...the stellar rotation, dynamics and rotational mixing of elements and allows us to learn from the differ- ences ...
9
Stellar magnetic activity and exoplanets
... magnetic activity and exoplanets ...magnetic activity could be enhanced due to interactions between close-in massive planets and their host ...between stellar magnetic activity and exoplanets. ...
6
Disentangling stellar activity and planetary signals
... fitting activity and planetary signals on GJ674 and ...the stellar active ...and stellar-activity induced-RV variations provided that 1) the planetary orbital period is not close to that of ...
6
The connection between stellar activity cycles and magnetic field topology
... their activity cycle despite having Ro & ...by rotation period with the transition occurring at a rotation period of roughly 15 ...that rotation period is an important parameter determining ...
9
Planets and stellar activity : hide and seek in the CoRoT 7 system
... identified by means of a Fourier analysis, and a sine fitted with this period is subtracted from the data. This operation is applied to the residuals to remove the next strongest signal, and so on until the noise level ...
15
Transiting the Sun II The impact of stellar activity on Lyα transits
... Solar rotation period can clearly be seen. This modulation, while varying by up to ∼ 30% is not problematic for transit observations, which are taken over the period of a few hours and so such long term ...
7
The connection between stellar activity cycles and magnetic field topology
... Accepted 2016 August 9. Received 2016 August 9; in original form 2016 March 9 A B S T R A C T Zeeman–Doppler imaging (ZDI) has successfully mapped the large-scale magnetic fields of stars over a large range of spectral ...
9
The connection between stellar activity cycles and magnetic field topology
... 16 Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA 11 August 2016 ABSTRACT Zeeman Doppler imaging has successfully mapped the large-scale magnetic fields of stars over a large range of ...
9
Chromospheric activity catalogue of 4454 cool stars: questioning the active branch of stellar activity cycles
... that stellar activity cycles could lie in the intermediate region between the active and inactive ...the activity branches, unless we only focus on the stars classified as ...
23
The stellar rotation–activity relation for a sample of SuperWASP and ASAS-SN field stars
... X-ray activity and the Rossby number, Ro, the ratio of rotation period to the convective turnover ...X-ray activity is constant) and an unsaturated regime (where X-ray activity anti-correlates ...
12
Stellar magnetism : empirical trends with age and rotation
... provide stellar age estimates from rotation measurements (Barnes 2003; Barnes & Kim ...derive stellar age (Christensen- Dalsgaard 1988; Ot´ı Floranes, Christensen-Dalsgaard & Thompson 2005), although ...
14
Stellar magnetism: empirical trends with age and rotation
... ASSESS STELLAR AGE One of our most interesting findings is the empirical trend between large-scale magnetism and ...star, stellar evolution codes can be used as a tool to determine stel- lar age, from ...
15
Stellar and Molecular Gas Rotation in a Recently Quenched Massive Galaxy at z ∼ 0.7
... more data are required. Radio or X-ray observations may reveal the presence of quasar activity, while deeper IR and radio observations, as with the Very Large Array (VLA), may uncover heavily dust-obscured star ...
7
Stellar magnetic activity – Star-Planet Interactions
... ionized stellar wind, which couples to the stellar magnetic field on its journey away from the star and thus carries away angular ...how stellar rotation and magnetic activity evolve ...
6
Role of longitudinal activity complexes for solar and stellar dynamos
... As a conclusion, one might say that a weak non-axisymmetric component of the solar magnetic field exists, and is affected by the differential rotation of the solar convection zone. Due to its weakness and dynamical ...
Seismological insights into solar and stellar magnetic activity cycles
... shorter activity cycles than the Sun: As can be seen from Figure 8 there is a well known relation between a star’s rotation rate and the length of its cycle: Very broadly, cycle length increases with ...
9
Towards age/rotation/magnetic activity relation with seismology
... of stellar ages directly impacts the characterization of a plan- etary system as it puts strong constraints on the moment when the system was ...precise stellar ages is a very difficult ...magnetic ...
6
Testing the recovery of stellar rotation signals from Kepler light curves using a blind hare and hounds exercise
... of rotation periods, activity levels and spot lifetime were chosen to be representative of the Kepler data of solar-like ...differential rotation shear, suggesting that differential rotation ...
16
The host stars of Kepler's habitable exoplanets : superflares, rotation and activity
... 4.5 Stellar mass-loss rates Most of the mass-loss rates reported in Table 4 are an order of magnitude or more lower than the solar ...longer rotation pe- riods as compared to the ...shorter rotation ...
17
Rotation and stellar evolution
... of rotation on the global properties and internal structure of low-mass stars from the pre-main sequence to the red-giant ...shellular rotation to observations available for low-mass stars, we have seen ...
10