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@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 = {http://dx.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 and 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, vol.~18, No~11, p.~1-12. ISSN~1674-4527. Available from: https://dx.doi.org/10.1088/1674-4527/18/11/135.
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