scholarly journals Stellar chromospheric activity of 1 674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity

2020 ◽  
Author(s):  
J. Gomes da Silva ◽  
N.C. Santos ◽  
V. Adibekyan ◽  
S. G. Sousa ◽  
T. L. Campante ◽  
...  
Keyword(s):  
Chromospheric Activity

Chromospheric activity as a function of age in main-sequence stars

1966 ◽  
Vol 24 ◽  
pp. 40-43
Author(s):  
O. C. Wilson ◽  
A. Skumanich
Keyword(s):  
Main Sequence ◽  
The Sun ◽  
Main Sequence Stars ◽  
Tentative Conclusion ◽  
Chromospheric Activity ◽  
General Field ◽  
Large Clusters

Evidence previously presented by one of the authors (1) suggests strongly that chromospheric activity decreases with age in main sequence stars. This tentative conclusion rests principally upon a comparison of the members of large clusters (Hyades, Praesepe, Pleiades) with non-cluster objects in the general field, including the Sun. It is at least conceivable, however, that cluster and non-cluster stars might differ in some fundamental fashion which could influence the degree of chromospheric activity, and that the observed differences in chromospheric activity would then be attributable to the circumstances of stellar origin rather than to age.

Chromospheric activity in several single late-type stars

2015 ◽  
Vol 15 (2) ◽  
pp. 252-274 ◽  
Author(s):  
Li-Yun Zhang ◽  
Qing-Feng Pi ◽  
Zhong-Zhong Zhu
Keyword(s):  
Late Type ◽  
Chromospheric Activity

scholarly journals The large scale magnetic field of the G0 dwarf HD 206860 (HN Peg)

2013 ◽  
Vol 9 (S302) ◽  
pp. 146-147
Author(s):  
Sudeshna Boro Saikia ◽  
Sandra V. Jeffers ◽  
Pascal Petit ◽  
Stephen Marsden ◽  
Julien Morin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spectral Type ◽  
Large Scale ◽  
Longitudinal Magnetic Field ◽  
Chromospheric Activity ◽  
Large Scale Magnetic Field ◽  
Debris Disk ◽  
Infrared Triplet

AbstractHD 206860 is a young planet (HN Peg b) hosting star of spectral type G0V and it has a potential debris disk around it. In this work we measure the longitudinal magnetic field of HD 206860 using spectropolarimetric data and we measure the chromospheric activity using Ca II H&K, H-alpha and Ca II infrared triplet lines.

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

2009 ◽  
Vol 499 (1) ◽  
pp. L9-L12 ◽  
Author(s):  
G. Pace ◽  
J. Melendez ◽  
L. Pasquini ◽  
G. Carraro ◽  
J. Danziger ◽  
...  
Keyword(s):  
Chromospheric Activity ◽  
Stellar Ages

scholarly journals Fine structure of the age-chromospheric activity relation in solar-type stars

2016 ◽  
Vol 595 ◽  
pp. A11 ◽  
Author(s):  
D. Lorenzo-Oliveira ◽  
G. F. Porto de Mello ◽  
L. Dutra-Ferreira ◽  
I. Ribas
Keyword(s):  
Fine Structure ◽  
Chromospheric Activity ◽  
Solar Type

scholarly journals CHROMOSPHERIC ACTIVITY NATURE OF KIC 6044064

2021 ◽  
Vol 57 (2) ◽  
pp. 351-361
Author(s):  
E. Yoldaş
Keyword(s):  
Primary Component ◽  
Secondary Component ◽  
Migration Period ◽  
Chromospheric Activity ◽  
Spot Group ◽  
Kepler Mission ◽  
Phase Interval

This study presents results obtained from the data of KIC 6044064 (KOI 6652). KIC 6044064 was observed by the Kepler Mission for a total of 1384.254 days. 525 minima times were determined, 264 of which were primary minima and the rest were secondary minima. The OPEA model was derived and its parameters were obtained. On the secondary component, there are two different spot bands latitudinally outstretched, consisting of three spots located with a phase interval of 0.33. The average migration period was found to be 623.063±4.870 days (1.71±0.01 years) for the first spot group, while it was 1125.514±7.305 days (3.08±0.02 years) for the second group. The spectral types of the components seem to be G7V+K9V. Their masses and radii were determined to be 0.86Mʘ and 0.89Rʘ for the primary component and 0.54Mʘ and 0.62Rʘ for the secondary component.

WIYN Open Cluster Study. LXXXIV. The Effect of Chromospheric Activity on Oxygen Abundances from the 7774 Å Triplet in Pleiades Dwarfs

2021 ◽  
Vol 908 (2) ◽  
pp. 119
Author(s):  
Ryan M. Maderak ◽  
Constantine P. Deliyannis ◽  
Jeremy R. King ◽  
Aaron Steinhauer
Keyword(s):  
Open Cluster ◽  
Chromospheric Activity
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