Detailed Information on Publication Record
2017
An investigation of four chemically peculiar stars with photometric periods below 12 h
HUEMMERICH, Stefan, Klaus BERNHARD, Ernst PAUNZEN, Franz-Josef HAMBSCH, Terry BOHLSEN et. al.Basic information
Original name
An investigation of four chemically peculiar stars with photometric periods below 12 h
Authors
HUEMMERICH, Stefan (276 Germany), Klaus BERNHARD (276 Germany), Ernst PAUNZEN (40 Austria, guarantor, belonging to the institution), Franz-Josef HAMBSCH (56 Belgium), Terry BOHLSEN (36 Australia) and Jonathan POWLES (36 Australia)
Edition
Monthly Notices of the Royal Astronomical Society, Oxford, OXFORD UNIV PRESS, 2017, 0035-8711
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10308 Astronomy
Country of publisher
United Kingdom of Great Britain and Northern Ireland
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 5.194
RIV identification code
RIV/00216224:14310/17:00096505
Organization unit
Faculty of Science
UT WoS
000398284600009
Keywords in English
stars: chemically peculiar; stars: individual: HD 67983; stars: individual: HD 77013; stars: individual: HD 81076; stars: individual: HD 98000; stars: variables: delta Scuti
Tags
Tags
International impact, Reviewed
Změněno: 13/11/2018 11:15, doc. Ernst Paunzen, Dr.rer.nat
Abstract
V originále
We present an investigation of three chemically peculiar (CP) stars and one CP star candidate that exhibit photometric periods below 12 h. New spectroscopic observations have been acquired that confirm the peculiar nature of all objects. HD 77013 and HD 81076 are classical CP1 (Am) stars, HD 67983 is a marginal CP1 (Am:) star and HD 98000 is a CP2 (Ap) star. We have procured observations from the ASAS-3 and SuperWASP archives and obtained additional photometry in order to verify the results from the sky survey data. We have derived astrophysical parameters and investigated the positions of our target stars in the MBol versus log Teff diagram, from which information on evolutionary status has been derived. We present period analyses and discuss each object in detail. From the available data, we propose pulsational variability as the underlying mechanism for the variability in HD 67983, HD 77013 and HD 81076, which offer the opportunity to study the interaction of atomic diffusion and pulsation. HD 67983 and HD 77013 exhibit multiperiodic variability in the. Doradus frequency realm; HD 81076 is a d Scuti star. The CP2 star HD 98000 exhibits monoperiodic variability with a frequency of f approximate to 2.148 cycles d(-1) (P approximate to 0.466 d), which we interpret as the rotational period. If this assumption is correct, HD 98000 is the alpha(2) Canum Venaticorum variable with the shortest period hitherto observed and thus a very interesting object that might help to investigate the influence of rotational mixing on chemical peculiarities.
Links
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