A spectroscopic and photometric investigation of the mercury–manganese star KIC 6128830

Hummerich, Stefan and Niemczura, Ewa and Walczak, Przemysław and Paunzen, Ernst and Bernhard, Klaus and Murphy, Simon J. and Drobek, Dominik (2017) A spectroscopic and photometric investigation of the mercury–manganese star KIC 6128830. Monthly Notices of the Royal Astronomical Society, 474 (2). pp. 2467-2478. ISSN 0035-8711

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The advent of space-based photometry provides the opportunity for the first precise characterizations of variability in mercury–manganese (HgMn/CP3) stars, which might advance our understanding of their internal structure. We have carried out a spectroscopic and photometric investigation of the candidate CP3 star KIC 6128830. A detailed abundance analysis based on newly acquired high-resolution spectra was performed, which confirms that the star's abundance pattern is fully consistent with its proposed classification. Photometric variability was investigated using 4 yr of archival Kepler data. In agreement with results from the literature, we have identified a single significant and independent frequency f1 = 0.2065424 d−1 with a peak-to-peak amplitude of ∼3.4 mmag and harmonic frequencies up to 5f1. Drawing on the predictions of state-of-the-art pulsation models and information on evolutionary status, we discuss the origin of the observed light changes. Our calculations predict the occurrence of g-mode pulsations at the observed variability frequency. On the other hand, the strictly mono-periodic nature of the variability strongly suggests a rotational origin. While we prefer the rotational explanation, the present data leave some uncertainty.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 27 Apr 2022 03:14
Last Modified: 28 Apr 2022 03:38
Uncontrolled Keywords: Stars: abundances; Stars: atmospheres; Stars: chemically peculiar; Stars: individual: KIC 6128830; Stars: variables: general; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.1093/mnras/stx2974
URI: http://eprints.usq.edu.au/id/eprint/47891

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