Very regular high-frequency pulsation modes in young intermediate-mass stars

Bedding, Timothy R. and Murphy, Simon J. and Hey, Daniel R. and Huber, Daniel and Li, Tanda and Smalley, Barry and Stello, Dennis and White, Timothy R. and Ball, Warrick H. and Chaplin, William J. and Colman, Isabel L. and Fuller, Jim and Gaidos, Eric and Harbeck, Daniel R. and Hermes, J. J. and Holdsworth, Daniel L. and Li, Gang and Li, Yaguang and Mann, Andrew W. and Reese, Daniel R. and Sekaran, Sanjay and Yu, Jie and Antoci, Victoria and Bergmann, Christoph and Brown, Timothy M. and Howard, Andrew W. and Ireland, Michael J. and Isaacson, Howard and Jenkins, Jon M. and Kjeldsen, Hans and McCully, Curtis and Rabus, Markus and Rains, Adam D. and Ricker, George R. and Tinney, Christopher G. and Vanderspek, Roland K. (2020) Very regular high-frequency pulsation modes in young intermediate-mass stars. Nature, 581 (7807). pp. 147-151. ISSN 0028-0836


Abstract

Asteroseismology probes the internal structures of stars by using their natural pulsation frequencies1. It relies on identifying sequences of pulsation modes that can be compared with theoretical models, which has been done successfully for many classes of pulsators, including low-mass solar-type stars, red giants, high-mass stars and white dwarfs. However, a large group of pulsating stars of intermediate mass—the so-called δ Scuti stars—have rich pulsation spectra for which systematic mode identification has not hitherto been possible. This arises because only a seemingly random subset of possible modes are excited and because rapid rotation tends to spoil regular patterns. Here we report the detection of remarkably regular sequences of high-frequency pulsation modes in 60 intermediate-mass main-sequence stars, which enables definitive mode identification. The space motions of some of these stars indicate that they are members of known associations of young stars, as confirmed by modelling of their pulsation spectra.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 14 Jul 2022 04:39
Last Modified: 30 Aug 2022 04:40
Uncontrolled Keywords: probe; seismology; spectrum; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1038/s41586-020-2226-8
URI: http://eprints.usq.edu.au/id/eprint/47864

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