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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00104474" target="_blank" >RIV/00216224:14310/18:00104474 - isvavai.cz</a>

Alternative codes found

RIV/67985815:_____/18:00499982 RIV/68378271:_____/18:00499982

Result on the web

<a href="http://dx.doi.org/10.1088/1674-4527/18/11/135" target="_blank" >http://dx.doi.org/10.1088/1674-4527/18/11/135</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1674-4527/18/11/135" target="_blank" >10.1088/1674-4527/18/11/135</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

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

Name of the periodical

Research in Astronomy and Astrophysics

ISSN

1674-4527

e-ISSN

—

Volume of the periodical

18

Issue of the periodical within the volume

11

Country of publishing house

CN - CHINA

Number of pages

12

Pages from-to

1-12

UT code for WoS article

000448829000005

EID of the result in the Scopus database

2-s2.0-85056100895