A Search for Pulsations in Four Late-Type Giants

Abstract

view Abstract Citations (11) References (35) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Search for Pulsations in Four Late-Type Giants Horner, Scott Abstract I observed four late-type giant stars to search for oscillations similar to those observed on Arcturus. For these observations, I used the Kitt Peak National Observatory Coudé Feed telescope and Fiber Optic Echelle spectrograph. I observed α Ari, γ Per, ɛ Tau, and α Aur (a close binary composed of two G giants) for 12 nights, observing each star ∼5 times per night in order to detect oscillations with periods on the order of 2 days. I chose these stars, which range in spectral types from G8 III to K2 III, because of their spectral similarity to Arcturus (α Boo, K1 III), for which earlier observations revealed oscillations. No oscillations were detected on any of the four stars observed in this campaign. The upper limits of the oscillation amplitudes at periods comparable to those seen on Arcturus fall well below those observed for Arcturus. Continued observations of Arcturus are required to determine whether the observed period and amplitude are stable, or if the structure of Arcturus is different from the late-type giants observed in this campaign. Publication: The Astrophysical Journal Pub Date: March 1996 DOI: 10.1086/176983 Bibcode: 1996ApJ...460..449H Keywords: STARS: LATE-TYPE; STARS: OSCILLATIONS; TECHNIQUES: RADIAL VELOCITIES full text sources ADS | data products SIMBAD (8)