HD 99458: First time ever Ap-type star as a delta Scuti pulsator in a short period eclipsing binary?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19240%2F19%3AA0000535" target="_blank" >RIV/47813059:19240/19:A0000535 - isvavai.cz</a>

Výsledek na webu

<a href="https://academic.oup.com/mnras/article/487/3/4230/5510467" target="_blank" >https://academic.oup.com/mnras/article/487/3/4230/5510467</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stz1478" target="_blank" >10.1093/mnras/stz1478</a>

Jazyk výsledku

angličtina

Název v původním jazyce

HD 99458: First time ever Ap-type star as a delta Scuti pulsator in a short period eclipsing binary?

Popis výsledku v původním jazyce

We present the discovery of a unique object, a chemically peculiar Ap-type star showing delta Scuti pulsations that, is bound in an eclipsing binary system with an orbital period shorter than 3 d. HD 99458 is therefore a complex astrophysical laboratory opening doors for studying various, often contradictory, physical phenomena at the same time. It is the first Ap star ever discovered in an eclipsing binary. The orbital period of 2.722 d is the second shortest among all known chemically peculiar (CP2) binary stars. Pulsations of delta Scuti type are also extremely rare among CP2 stars and no unambiguously proven candidate has been reported. HD 99458 was formerly thought to he a star hosting an exoplanet, but we definitely reject this hypothesis using photometric observations from the K2 mission and new radial velocity measurements. The companion is a low-mass red dwarf star (M_2 = 0.45(2) M_Sun) on an inclined orbit (i = 73.2(6) deg) that shows only grazing eclipses. The rotation and orbital periods are synchronized, while the rotation and orbital axes are misaligned. HD 99458 is an interesting system deserving of more intense investigations.

Název v anglickém jazyce

HD 99458: First time ever Ap-type star as a delta Scuti pulsator in a short period eclipsing binary?

Popis výsledku anglicky

We present the discovery of a unique object, a chemically peculiar Ap-type star showing delta Scuti pulsations that, is bound in an eclipsing binary system with an orbital period shorter than 3 d. HD 99458 is therefore a complex astrophysical laboratory opening doors for studying various, often contradictory, physical phenomena at the same time. It is the first Ap star ever discovered in an eclipsing binary. The orbital period of 2.722 d is the second shortest among all known chemically peculiar (CP2) binary stars. Pulsations of delta Scuti type are also extremely rare among CP2 stars and no unambiguously proven candidate has been reported. HD 99458 was formerly thought to he a star hosting an exoplanet, but we definitely reject this hypothesis using photometric observations from the K2 mission and new radial velocity measurements. The companion is a low-mass red dwarf star (M_2 = 0.45(2) M_Sun) on an inclined orbit (i = 73.2(6) deg) that shows only grazing eclipses. The rotation and orbital periods are synchronized, while the rotation and orbital axes are misaligned. HD 99458 is an interesting system deserving of more intense investigations.

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

2019

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

1365-2966

Svazek periodika

487

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

4230-4237

Kód UT WoS článku

000478053200094

EID výsledku v databázi Scopus

2-s2.0-85072407424