A survey of TiOλ567 nm absorption in solar-type stars

2017/12/28 by Fatemeh Azizi, Mohammad Taghi Mirtorabi · 5 citations
Physics and Astronomy · #Absorption (acoustics) #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Optics #Physics #Planet #Stars #Stellar, planetary, and galactic studies #astro-ph.SR

paper · pdf · doi:10.1093/mnras/stx3324

published in Monthly Notices of the Royal Astronomical Society 475(2), 2253-2268 (Oxford University Press) · 17 pages, 95 figures, 2 tables, accepted for publication in MNRAS

arxiv created 2017/12/28 · openalex publication_date 2017/12/28 · openalex created_date 2018/01/05 · arxiv updated 2018/02/14 · openalex updated_date 2026/08/05

Abstract

Molecular absorption bands are estimators of stellar activity and spot cycles on magnetically active stars. We have previously introduced a new colour index that compares absorption strength of the titanium oxide (TiO) at 567 nm with nearby continuum. In this paper, we implement this index to measure long-term activity variations and the statistical properties of the index in a sample of 302 solar-type stars from the High Accuracy Radial Velocity Planet search Spectrograph planet search programme. The results indicate a pattern of change in star's activity, covers a range of periods from 2 yr up to 17 yr.

Citations

• Least-squares frequency analysis of unequally spaced data
• Studies in astronomical time series analysis. II - Statistical aspects of spectral analysis of unevenly spaced data
• FALSE-ALARM PROBABILITY IN RELATION TO OVERSAMPLED POWER SPECTRA, WITH APPLICATION TO SUPER-KAMIOKANDE SOLAR NEUTRINO DATA
• Long-term magnetic activity of a sample of M-dwarf stars from the HARPS program
• Near‐Infrared Classification Spectroscopy:J‐Band Spectra of Fundamental MK Standards
• The generalised Lomb-Scargle periodogram