Hey, Daniel R. and Holdsworth, Daniel L. and Bedding, Timothy R. and Murphy, Simon J. and Cunha, Margarida S. and Kurtz, Donald W. and Huber, Daniel and Fulton, Benjamin and Howard, Andrew W. (2019) Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology. Monthly Notices of the Royal Astronomical Society, 488 (1). pp. 18-36. ISSN 0035-8711. doi:10.1093/mnras/stz1633. https://resolver.caltech.edu/CaltechAUTHORS:20190619-142328859
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Abstract
We perform a search for rapidly oscillating Ap stars in the Kepler long-cadence data, where true oscillations above the Nyquist limit of 283.21 μHz can be reliably distinguished from aliases as a consequence of the barycentric time corrections applied to the Kepler data. We find evidence for rapid oscillations in six stars: KIC 6631188, KIC 7018170, KIC 10685175, KIC 11031749, KIC 11296437, and KIC 11409673, and identify each star as chemically peculiar through either pre-existing classifications or spectroscopic measurements. For each star, we identify the principal pulsation mode, and are able to observe several additional pulsation modes in KIC 7018170. We find that KIC 7018170 and KIC 11409673 both oscillate above their theoretical acoustic cut-off frequency, whilst KIC 11031749 oscillates at the cut-off frequency within uncertainty. All but KIC 11031749 exhibit strong amplitude modulation consistent with the oblique pulsator model, confirming their mode geometry and periods of rotation.
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| Additional Information: | © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2019 June 10. Received 2019 June 8; in original form 2019 May 9. Published: 13 June 2019. We are thankful to the entire Kepler team for such incredible data. DRH gratefully acknowledges the support of the Australian Government Research Training Program (AGRTP) and University of Sydney Merit Award scholarships. This research has been supported by the Australian Government through the Australian Research Council DECRA grant number DE180101104. DLH and DWK acknowledge financial support from the Science and Technology Facilities Council (STFC) via grant ST/M000877/1. MC is supported in the form of work contract funded by national funds through Fundação para a Ciância e Tecnologia (FCT) and acknowledges the supported by FCT through national funds and by FEDER through COMPETE2020 by these grants: UID/FIS/04434/2019, PTDC/FIS-AST/30389/2017 and POCI-01-0145-FEDER-030389. DH acknowledges support by the National Science Foundation (AST-1717000). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawai‘ian community. We are most fortunate to have the opportunity to conduct observations from this mountain. This research was partially conducted during the Exostar19 program at the Kavli Institute for Theoretical Physics at UC Santa Barbara, which was supported in part by the National Science Foundation under Grant No. NSF PHY-1748958. Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope; LAMOST) is a National Major Scientific Project built by the Chinese Academy of Sciences. Funding for the project has been provided by the National Development and Reform Commission. LAMOST is operated and managed by the National Astronomical Observatories, Chinese Academy of Sciences. | ||||||||||||||||||||||||||
| Group: | Infrared Processing and Analysis Center (IPAC), Astronomy Department | ||||||||||||||||||||||||||
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| Subject Keywords: | asteroseismology - stars: chemically peculiar - stars: oscillations - techniques: photometric | ||||||||||||||||||||||||||
| Issue or Number: | 1 | ||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stz1633 | ||||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20190619-142328859 | ||||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190619-142328859 | ||||||||||||||||||||||||||
| Official Citation: | Daniel R Hey, Daniel L Holdsworth, Timothy R Bedding, Simon J Murphy, Margarida S Cunha, Donald W Kurtz, Daniel Huber, Benjamin Fulton, Andrew W Howard, Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology, Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 1, September 2019, Pages 18–36, https://doi.org/10.1093/mnras/stz1633 | ||||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||
| ID Code: | 96573 | ||||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||||||||||||||||
| Deposited On: | 19 Jun 2019 21:41 | ||||||||||||||||||||||||||
| Last Modified: | 16 Nov 2021 17:22 |
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