Measuring stellar oscillations using equivalent widths of absorption lines

Abstract

Kjeldsen et al. (1995, AJ 109, 1313; astro-ph/9411016) have developed a new technique for measuring stellar oscillations and claimed a detection in the G subgiant eta Boo. The technique involves monitoring temperature fluctuations in a star via their effect on the equivalent width of Balmer lines. In this paper we use synthetic stellar spectra to investigate the temperature dependence of the Balmer lines, Ca II, Fe I, the Mg b feature and the G~band. We present a list of target stars likely to show solar-like oscillations and estimate their expected amplitudes. We also show that centre-to-limb variations in Balmer-line profiles allow one to detect oscillation modes with l<=4, which accounts for the detection by Kjeldsen et al. of modes with degree l=3 in integrated sunlight.

MNRAS (accepted); 7 pages, LaTeX with necessary style file and PostScript figures in a single uuencoded Z-compressed .tar file

Cited by in corpus (23)

• Standing on the shoulders of Dwarfs: the $Kepler$ asteroseismic LEGACY sample I - oscillation mode parameters
• Determining stellar macroturbulence using asteroseismic rotational velocities from Kepler
• Solar-like oscillations in alpha Centauri B
• Accurate fundamental parameters for 23 bright solar-type stars
• Solar-like Oscillations (Invited Review)
• The amplitude of solar oscillations using stellar techniques
• The asteroseismic potential of TESS: exoplanet-host stars
• Bayesian peak-bagging of solar-like oscillators using MCMC: A comprehensive guide
• First Results From The Hertzsprung Song Telescope: Asteroseismology Of The G5 Subgiant Star {\Mu}Her
• Solar-like oscillations and activity in Procyon: A comparison of the 2007 MOST and ground-based radial velocity campaigns
• A search for solar-like oscillations and granulation in alpha Cen A
• Modelling the Autocovariance of the Power Spectrum of a Solar-Type Oscillator
• Time-series Spectroscopy of Pulsating sdB stars III: Line Indices of PG1605+072
• Convective Excitation and Damping of Solar-like Oscillations
• Seismology of Procyon A: determination of mode frequencies, amplitudes, lifetimes, and granulation noise
• Nearby stars as gravitational wave detectors
• The asteroseismic potential of CHEOPS
• A Distant Mirror: Solar Oscillations Observed on Neptune by the Kepler K2 Mission
• Luminaries in the Sky: The TESS Legacy Sample of Bright Stars. I. Asteroseismic detections in naked-eye main-sequence and sub-giant solar-like oscillators
• The mass and age of the first SONG target: the red giant 46 LMi
• Benefits of multiple sites for asteroseismic detections
• Asteroseismology with PBjam 2.0: measuring dipole mode frequencies in coupling regimes from main sequence to low-luminosity red giant stars
• EPIC 202843107 : A Close Eclipsing Binary Containing a δ Scuti Variable