Humps and bumps: the effects of shocks on the optical light curves of fundamental-mode RR Lyrae stars

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dc.contributor.authorPrudil, Z.
dc.contributor.authorDekany, I.
dc.contributor.authorSmolec, R.
dc.contributor.authorCatelan, M.
dc.contributor.authorGrebel, E. K.
dc.contributor.authorKunder, A.
dc.date.accessioned2024-01-10T12:05:55Z
dc.date.available2024-01-10T12:05:55Z
dc.date.issued2020
dc.description.abstractWe present the most extended and homogeneous study carried out so far of the main and early shocks in 1485 RR Lyrae stars in the Galactic bulge observed by the Optical Gravitational Lensing Experiment. We selected nonmodulated fundamental-mode RR Lyrae stars with good-quality photometry. Using a self-developed method, we determined the centers and strengths of main and early shock features in the phased light curves. We found that the positions of both humps and bumps are highly correlated with the pulsation properties of the studied variables. Pulsators with a pronounced main shock are concentrated in the low-amplitude regime of the period-amplitude diagram, while stars with a strong early shock have average and above-average pulsation amplitudes. A connection between the main and early shocks and the Fourier coefficients is also observed. In the color-magnitude diagram, we see a separation between stars with strong and weak shocks. Variables with a pronounced main shock cluster close to the fundamental red edge of the instability strip (IS), while stars with a strong early shock tend to clump in the center and near the fundamental blue edge of the IS. The appearance of shocks and their properties appear to be independent of the direction of evolution estimated from the period change rate of the studied stars. In addition, the differences in the period change rate between the two main Oosterhoff groups found in the Galactic bulge suggest that stars of Oosterhoff type I are located close to the zero-age horizontal branch while Oosterhoff type II variables are on their way toward the fundamental red edge of the instability strip, and have therefore already left the zero-age horizontal branch.
dc.description.funderHector Fellow Academy
dc.description.funderNational Science Center, Poland
dc.description.funderGerman Research Foundation (DFG)
dc.description.funderFondecyt
dc.description.funderMinistry for the Economy, Development, and Tourism's Millennium Science Initiative
dc.description.funderProyecto Basal
dc.fechaingreso.objetodigital2024-05-02
dc.format.extent12 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/201936704
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201936704
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/76088
dc.identifier.wosidWOS:000519609200001
dc.information.autorucFísica;Catelan Marcio;S/I;1001556
dc.language.isoen
dc.nota.accesocontenido parcial
dc.publisherEDP SCIENCES S A
dc.revistaASTRONOMY & ASTROPHYSICS
dc.rightsacceso restringido
dc.subjectstars: variables: RR Lyrae
dc.subjecttechniques: photometric
dc.subjectshock waves
dc.subjectGalaxy: bulge
dc.subjectGRAVITATIONAL LENSING EXPERIMENT
dc.subjectPERIODIC VARIABLE-STARS
dc.subjectBAADES WINDOW FIELDS
dc.subjectGALACTIC-BULGE
dc.subjectHORIZONTAL-BRANCH
dc.subjectGLOBULAR-CLUSTERS
dc.subjectSTELLAR EVOLUTION
dc.subjectCATALOG
dc.subjectPHOTOMETRY
dc.subjectPHASE
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleHumps and bumps: the effects of shocks on the optical light curves of fundamental-mode RR Lyrae stars
dc.typeartículo
dc.volumen635
sipa.codpersvinculados1001556
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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