The search for roAp stars: null results and new candidates from
Stromgren-Crawford photometry

J 2018

The search for roAp stars: null results and new candidates from Stromgren-Crawford photometry

PAUNZEN, Ernst; Gerald HANDLER; Kateřina HOŇKOVÁ; Jakub JURÝŠEK; Martin MAŠEK et al.

Základní údaje

Originální název

The search for roAp stars: null results and new candidates from Stromgren-Crawford photometry

Autoři

Vydání

Research in Astronomy and Astrophysics, BEIJING, Science Press, 2018, 1674-4527

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Čína

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.254

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/18:00104474

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

stars: chemically peculiar; stars: early-type; stars: variables: general; techniques: photometric

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 23. 4. 2024 12:40, Mgr. Michal Petr

Anotace

V originále

The rapidly oscillating Ap (roAp) stars exhibit pulsational photometric and/or radial velocity variations on time scales of several minutes, which are essential to test current pulsation models as well as our assumptions of atmospheric structure characteristics. In addition, their chemical peculiarity makes them very interesting for probing stellar formation and evolution in the presence of a global magnetic field. To date, a limited number of only 61 roAp stars is known to show photometric variability. On the other hand, a literature survey yields 619 unique stars that have unsuccessfully been searched for variability of this kind. Stromgren-Crawford uvby beta photometry of stars from both subgroups was used to investigate whether there is a selection bias for the investigated stars. We also present new photometric measurements (202 hours on 59 different nights) of 55 roAp candidates. We did not detect any new roAp star. Although our detection limits are comparable to other surveys, we also did not find pulsations in the known roAp star HD 12098, which may be a consequence of temporal amplitude changes. On the other hand, we do find some evidence for photometric variability of beta CrB at its spectroscopically derived pulsation period. From the uvby beta photometry we conclude that the blue border of the roAp instability strip appears observationally well defined, whereas the red border is rather poorly known and studied. Within these boundaries, a total of 4646 candidates were identified which appear worth investigating for short-term pulsational variability.

Návaznosti

7AMB17AT030, projekt VaV

Název: Analýza hvězd se skvrnami pomocí kvalitních pozorovacích dat

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Analýza hvězd se skvrnami pomocí kvalitních pozorovacích dat

Citovat

PAUNZEN, Ernst; Gerald HANDLER; Kateřina HOŇKOVÁ; Jakub JURÝŠEK; Martin MAŠEK; Marek DRÓŻDŻ; Jan JANÍK; Waldemar OGLOZA; Lars HERMANSSON; Mats JOHANSSON; Martin JELÍNEK; Marek SKARKA a Miloslav ZEJDA. The search for roAp stars: null results and new candidates from Stromgren-Crawford photometry. Research in Astronomy and Astrophysics. BEIJING: Science Press, 2018, roč. 18, č. 11, s. 1-12. ISSN 1674-4527. Dostupné z: https://doi.org/10.1088/1674-4527/18/11/135.

@article{1468337,
   author = {Paunzen, Ernst and Handler, Gerald and Hoňková, Kateřina and Jurýšek, Jakub and Mašek, Martin and Dróżdż, Marek and Janík, Jan and Ogloza, Waldemar and Hermansson, Lars and Johansson, Mats and Jelínek, Martin and Skarka, Marek and Zejda, Miloslav},
   article_location = {BEIJING},
   article_number = {11},
   doi = {https://doi.org/10.1088/1674-4527/18/11/135},
   keywords = {stars: chemically peculiar; stars: early-type; stars: variables: general; techniques: photometric},
   language = {eng},
   issn = {1674-4527},
   journal = {Research in Astronomy and Astrophysics},
   title = {The search for roAp stars: null results and new candidates from Stromgren-Crawford photometry},
   url = {http://dx.doi.org/10.1088/1674-4527/18/11/135},
   volume = {18},
   year = {2018}
}

TY  - JOUR
ID  - 1468337
AU  - Paunzen, Ernst - Handler, Gerald - Hoňková, Kateřina - Jurýšek, Jakub - Mašek, Martin - Dróżdż, Marek - Janík, Jan - Ogloza, Waldemar - Hermansson, Lars - Johansson, Mats - Jelínek, Martin - Skarka, Marek - Zejda, Miloslav
PY  - 2018
TI  - The search for roAp stars: null results and new candidates from Stromgren-Crawford photometry
JF  - Research in Astronomy and Astrophysics
VL  - 18
IS  - 11
SP  - 1-12
EP  - 1-12
PB  - Science Press
SN  - 16744527
KW  - stars: chemically peculiar
KW  - stars: early-type
KW  - stars: variables: general
KW  - techniques: photometric
UR  - http://dx.doi.org/10.1088/1674-4527/18/11/135
N2  - The rapidly oscillating Ap (roAp) stars exhibit pulsational photometric and/or radial velocity variations on time scales of several minutes, which are essential to test current pulsation models as well as our assumptions of atmospheric structure characteristics. In addition, their chemical peculiarity makes them very interesting for probing stellar formation and evolution in the presence of a global magnetic field. To date, a limited number of only 61 roAp stars is known to show photometric variability. On the other hand, a literature survey yields 619 unique stars that have unsuccessfully been searched for variability of this kind. Stromgren-Crawford uvby beta photometry of stars from both subgroups was used to investigate whether there is a selection bias for the investigated stars. We also present new photometric measurements (202 hours on 59 different nights) of 55 roAp candidates. We did not detect any new roAp star. Although our detection limits are comparable to other surveys, we also did not find pulsations in the known roAp star HD 12098, which may be a consequence of temporal amplitude changes. On the other hand, we do find some evidence for photometric variability of beta CrB at its spectroscopically derived pulsation period. From the uvby beta photometry we conclude that the blue border of the roAp instability strip appears observationally well defined, whereas the red border is rather poorly known and studied. Within these boundaries, a total of 4646 candidates were identified which appear worth investigating for short-term pulsational variability.
ER  -

PAUNZEN, Ernst; Gerald HANDLER; Kateřina HOŇKOVÁ; Jakub JURÝŠEK; Martin MAŠEK; Marek DRÓ$\backslash$.ZD$\backslash$.Z; Jan JANÍK; Waldemar OGLOZA; Lars HERMANSSON; Mats JOHANSSON; Martin JELÍNEK; Marek SKARKA a Miloslav ZEJDA. The search for roAp stars: null results and new candidates from Stromgren-Crawford photometry. \textit{Research in Astronomy and Astrophysics}. BEIJING: Science Press, 2018, roč.~18, č.~11, s.~1-12. ISSN~1674-4527. Dostupné z: https://doi.org/10.1088/1674-4527/18/11/135.

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