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Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology

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. http://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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stz1633DOIArticle
https://arxiv.org/abs/1906.04353arXivDiscussion Paper
ORCID:
AuthorORCID
Hey, Daniel R.0000-0003-3244-5357
Holdsworth, Daniel L.0000-0003-2002-896X
Bedding, Timothy R.0000-0001-5222-4661
Huber, Daniel0000-0001-8832-4488
Fulton, Benjamin0000-0003-3504-5316
Howard, Andrew W.0000-0001-8638-0320
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)
Funders:
Funding AgencyGrant Number
Australian Government Research Training ProgramUNSPECIFIED
University of SydneyUNSPECIFIED
Australian Research CouncilDE180101104
Science and Technology Facilities Council (STFC)ST/M000877/1
Fundação para a Ciência e Tecnologia (FCT)UID/FIS/04434/2019
Fondo Europeo de Desarrollo Regional (FEDER)PTDC/FIS-AST/30389/2017
Fondo Europeo de Desarrollo Regional (FEDER)POCI-01-0145-FEDER-030389
NSFAST-1717000
Gaia Multilateral AgreementUNSPECIFIED
NSFPHY-1748958
National Development and Reform Commission (China)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Subject Keywords:asteroseismology - stars: chemically peculiar - stars: oscillations - techniques: photometric
Record Number:10.1093/mnras/stz1633
Persistent URL:http://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:10 Jul 2019 16:58

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