Chromospheric activity catalogue of 4454 cool stars

  title={Chromospheric activity catalogue of 4454 cool stars},
  author={Sudeshna Boro Saikia and C. J. Marvin and S. V. Jeffers and Ansgar Reiners and Robert H. Cameron and Stephen C. Marsden and Pascal Petit and J{\"o}rn Warnecke and Abhay Pratap Yadav},
  journal={Astronomy \& Astrophysics},
Context.Chromospheric activity monitoring of a wide range of cool stars can provide valuable information on stellar magnetic activity and its dependence on fundamental stellar parameters such as effective temperature and rotation.Aims.We compile a chromospheric activity catalogue of 4454 cool stars from a combination of archival HARPS spectra and multiple other surveys, including the Mount Wilson data that have recently been released by the NSO. We explore the variation in chromospheric… 

Chromospheric activity of nearby Sun-like stars

Context.The chromospheric emission in the cores of the Ca IIH & K lines of late-type dwarfs is a well known indicator of magnetic activity that decreases with increasing stellar age.Aims.I use this

Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample

Aims. The main objective of this project is to characterise chromospheric activity of FGK stars from the HARPS archive. We start, in this first paper, by presenting a catalogue of homogeneously

Stellar Chromospheric Variability

Cool stars with convective envelopes of spectral types F and later tend to exhibit magnetic activity throughout their atmospheres. The presence of strong and variable magnetic fields is evidenced by

CARMENES input catalog of M dwarfs

Context. Radial-velocity (RV) jitter caused by stellar magnetic activity is an important factor in state-of-the-art exoplanet discovery surveys such as CARMENES. Stellar rotation, along with

Empirically revealed properties of Rieger-type cycles of stellar activity

Context. The Rieger cycles were discovered in the Sun as a specific 154-day periodicity of flare occurrence; they strongly influence terrestrial space weather. This phenomenon is far from being

Cycles on the Solar-type Stars and Cooler Dwarfs

Features of the development of activity cycles in the solar-type stars and fast-rotating cool dwarfs have been considered for 65 stars observed in some decades. Cycles with duration of 7–18 years

Lithium abundance in a sample of active stars: High-resolution spectrograph observation with the 1.8 m telescope

Context. Observations of young, low-mass, main-sequence, and zero-age main-sequence stars show evidence of a correlation between lithium abundance and chromospheric activity, albeit with a very large

Long-term Periodicities in Kepler Photometry of Open Cluster NGC 6811

Long-term photometric variability can sometimes be related to the emergence of starspots in the photosphere following a quasi-periodic magnetic activity cycle. In order to investigate the existence

Exploring the Cycle Period and Parity of Stellar Magnetic Activity with Dynamo Modeling

Observations of chromospheric and coronal emissions from various solar-type stars show that the stellar magnetic activity varies with the rotation rates of the stars. The faster the star rotates, the

Stellar activity cycles as revealed by long-term beat-like patterns from light curves of Kepler

Stellar activity cycles have been found on many stars through different methods. Although in debate, an empirical relation has been found where a period of stellar activity cycle P cyc is positively



An investigation of chromospheric activity spanning the Vaughan-Preston gap: impact on stellar ages

Context. Chromospheric activity is widely used as an age indicator for solar-type stars based on the early evidence that there is a smooth evolution from young and active to old and inactive stars.

Stellar activity cycles

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

Measuring rotation periods of solar-like stars using TIGRE - A study of periodic CaII H+K S-index variability

Context. The rotation period of a star is a key parameter both for the stellar dynamo that generates magnetic fields as well as for stellar differential rotation. Aims. We present the results from


We present time series measurements of chromospheric activity for more than 2600 main-sequence and subgiant stars on the California Planet Search (CPS) program with spectral types ranging from about

Chromospheric Activity in G and K Main-Sequence Stars, and What It Tells Us about Stellar Dynamos

For main-sequence G and K stars we study again the empirical relations between the periods of the activity cycles, Pcyc, and the rotational periods, prot. We use the high-quality data selected by

The connection between stellar activity cycles and magnetic field topology

Zeeman-Doppler imaging (ZDI) has successfully mapped the large-scale magnetic fields of stars over a large range of spectral types, rotation periods and ages. When observed over multiple epochs, some

Direct observation of magnetic cycles in Sun-like stars

A sample of 19 solar-type stars, probing masses between 0.6 and 1.4 solar mass and rotation periods between 3.4 and 43 days, was regularly observed using the NARVAL spectropolarimeter at Telescope


Recent stellar chromospheric Ca II emission data are analyzed and interpreted within the framework of simple concepts of dynamo theory. From an examination of the rotation rates and B-V indexes of 26

Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo

We present measurements of chromospheric Ca ii H&K activity for 481 solar-like stars. To determine the activity we used the Mount Wilson method and a newly developed method which allows to also

A solar-like magnetic cycle on the mature K-dwarf 61 Cygni A (HD 201091)

The long-term monitoring of magnetic cycles in cool stars is a key diagnostic in understanding how dynamo generation and amplification of magnetic fields occur in stars similar in structure to the