Titanium Oxide Absorption as a Proxy to Detect Long term Variation and Activity Cycle in Proxima Centauri
Fatemeh Azizi, Mohammad Taghi Mirtorabi, Rahimeh Foroughi
Abstract
Stellar activity cycles on magnetically active stars can be estimated by molecular absorption bands. We have previously introduced a molecular index which compares absorptional line strength of the TiO567nm with its nearby continuum has previously been introduced. In this work we use this indicator to evaluation long-term activity variations for Proxima Centauri star, using spectroscopic data from HARPS. The results indicate periodicity with an activity period of 2873(+47.4-53.9) days, which is similar to the previous measurements from other indicators.
Create a lesson
Related papers
Oscillating dynamo models with a time-nonlocal α effect
Günther Rüdiger, Manfred Schultz, Alfio Bonanno
A large shell around the hypergiant VY Canis Majoris
D. P. K. Banerjee, V. Joshi, A. Evans et al.
Interferometric Survey of Stellar Parameters: Limb darkening study with the "Pipeline for Interferometric Measurements of Stars"
N. Ebrahimkutty, D. Mourard, P. Berio et al.
A homogeneous analysis of archival and new low-resolution spectra of YZ Cancri
Zhibin Dai, Lihuan Yu, Jiao Li et al.
The emergence of a [WC] star in Sakurai's object
W. Marcolino, P. A. M. van Hoof, V. C. Maria et al.
Spectral classification of OB-type stars using tree-based ensemble methods and evaluation of their explainability
J. E. Gonzales, S. Simón-Díaz, S. Cuellar et al.