An investigation of four chemically peculiar stars with photometric periods below 12 h

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00096505" target="_blank" >RIV/00216224:14310/17:00096505 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1093/mnras/stw3186" target="_blank" >http://dx.doi.org/10.1093/mnras/stw3186</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stw3186" target="_blank" >10.1093/mnras/stw3186</a>

Jazyk výsledku

angličtina

Název v původním jazyce

An investigation of four chemically peculiar stars with photometric periods below 12 h

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

An investigation of four chemically peculiar stars with photometric periods below 12 h

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

—

Svazek periodika

466

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

1399-1411

Kód UT WoS článku

000398284600009

EID výsledku v databázi Scopus

—