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

0499982 - FZÚ 2019 RIV GB eng J - Journal Article
Paunzen, E. - Handler, G. - Hoňková, K. - Juryšek, J. - Mašek, Martin - Drozdz, M. - Janík, J. - Ogloza, W. - Hermansson, L. - Johansson, M. - Jelínek, Martin - Skarka, Marek - Zejda, M.
The search for roAp stars: null results and new candidates from Stromgren-Crawford photometry.
Research in Astronomy and Astrophysics. Roč. 18, č. 11 (2018), s. 1-12, č. článku 135. ISSN 1674-4527. E-ISSN 2397-6209
R&D Projects: GA MŠMT LM2015038; GA MŠMT LG15014; GA MŠMT EF16_013/0001402
EU Projects: European Commission(XE) 283783 - GLORIA
Grant - others:OP VVV - AUGER-CZ(XE) CZ.02.1.01/0.0/0.0/16_013/0001402
Institutional support: RVO:68378271 ; RVO:67985815
Keywords : stars: chemically peculiar * stars: early-type * stars: variables: general * techniques: photometric
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 1.254, year: 2018
Method of publishing: Limited access
https://doi.org/10.1088/1674-4527/18/11/135

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. Strömgren-Crawford uvbyβ 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.
Permanent Link: http://hdl.handle.net/11104/0292163