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

J 2019

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

SKARKA, Marek; Petr KABÁTH; Ernst PAUNZEN; Miroslav FEDURCO; Ján BUDAJ et. al.

Basic information

Original name

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

Authors

Edition

Monthly Notices of the Royal Astronomical Society, 2019, 0035-8711

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

is not subject to a state or trade secret

References:

URL

Impact factor

Impact factor: 5.357

RIV identification code

RIV/47813059:19240/19:A0000535

Organization unit

Faculty of Philosophy and Science in Opava

DOI

https://doi.org/10.1093/mnras/stz1478

UT WoS

000478053200094

EID Scopus

2-s2.0-85072407424

Keywords in English

techniques: photometric; techniques: spectroscopic; binaries: eclipsing; stars: chemically peculiar; stars: individual: HD 99458; stars: oscillations

Abstract

In the original language

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.

Cite

SKARKA, Marek; Petr KABÁTH; Ernst PAUNZEN; Miroslav FEDURCO; Ján BUDAJ; Daniel DUPKALA; Jiří Bernard KRTIČKA; Artie P. HATZES; Theodor PRIBULLA; Štefan PARIMUCHA; Zdeněk MIKULÁŠEK; Eike W. GUENTHER; Silvia SABOTTA; Martin BLAŽEK; Jana DVOŘÁKOVÁ; Ľubomír HAMBÁLEK; Tereza KLOCOVÁ; V. KOLLÁR; Emil KUDRNA; Miroslav ŠLECHTA and Martin VAŇKO. HD 99458: First time ever Ap-type star as a delta Scuti pulsator in a short period eclipsing binary? Monthly Notices of the Royal Astronomical Society. 2019, vol. 487, No 3, p. 4230-4237. ISSN 0035-8711. Available from: https://doi.org/10.1093/mnras/stz1478.

@article{37377,
   author = {Skarka, Marek and Kabáth, Petr and Paunzen, Ernst and Fedurco, Miroslav and Budaj, Ján and Dupkala, Daniel and Krtička, Jiří Bernard and Hatzes, Artie P. and Pribulla, Theodor and Parimucha, Štefan and Mikulášek, Zdeněk and Guenther, Eike W. and Sabotta, Silvia and Blažek, Martin and Dvořáková, Jana and Hambálek, Ľubomír and Klocová, Tereza and Kollár, V. and Kudrna, Emil and Šlechta, Miroslav and Vaňko, Martin},
   article_number = {3},
   doi = {https://doi.org/10.1093/mnras/stz1478},
   keywords = {techniques: photometric; techniques: spectroscopic; binaries: eclipsing; stars: chemically peculiar; stars: individual: HD 99458; stars: oscillations},
   language = {eng},
   issn = {0035-8711},
   journal = {Monthly Notices of the Royal Astronomical Society},
   title = {HD 99458: First time ever Ap-type star as a delta Scuti pulsator in a short period eclipsing binary?},
   url = {https://academic.oup.com/mnras/article/487/3/4230/5510467},
   volume = {487},
   year = {2019}
}

TY  - JOUR
ID  - 37377
AU  - Skarka, Marek - Kabáth, Petr - Paunzen, Ernst - Fedurco, Miroslav - Budaj, Ján - Dupkala, Daniel - Krtička, Jiří Bernard - Hatzes, Artie P. - Pribulla, Theodor - Parimucha, Štefan - Mikulášek, Zdeněk - Guenther, Eike W. - Sabotta, Silvia - Blažek, Martin - Dvořáková, Jana - Hambálek, Ľubomír - Klocová, Tereza - Kollár, V. - Kudrna, Emil - Šlechta, Miroslav - Vaňko, Martin
PY  - 2019
TI  - HD 99458: First time ever Ap-type star as a delta Scuti pulsator in a short period eclipsing binary?
JF  - Monthly Notices of the Royal Astronomical Society
VL  - 487
IS  - 3
SP  - 4230-4237
EP  - 4230-4237
SN  - 00358711
KW  - techniques: photometric
KW  - techniques: spectroscopic
KW  - binaries: eclipsing
KW  - stars: chemically peculiar
KW  - stars: individual: HD 99458
KW  - stars: oscillations
UR  - https://academic.oup.com/mnras/article/487/3/4230/5510467
L2  - https://academic.oup.com/mnras/article/487/3/4230/5510467
N2  - 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.
ER  -

SKARKA, Marek; Petr KABÁTH; Ernst PAUNZEN; Miroslav FEDURCO; Ján BUDAJ; Daniel DUPKALA; Jiří Bernard KRTIČKA; Artie P. HATZES; Theodor PRIBULLA; Štefan PARIMUCHA; Zdeněk MIKULÁŠEK; Eike W. GUENTHER; Silvia SABOTTA; Martin BLAŽEK; Jana DVOŘÁKOVÁ; Ľubomír HAMBÁLEK; Tereza KLOCOVÁ; V. KOLLÁR; Emil KUDRNA; Miroslav ŠLECHTA and Martin VAŇKO. HD 99458: First time ever Ap-type star as a delta Scuti pulsator in a short period eclipsing binary? \textit{Monthly Notices of the Royal Astronomical Society}. 2019, vol.~487, No~3, p.~4230-4237. ISSN~0035-8711. Available from: https://doi.org/10.1093/mnras/stz1478.

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