Single-mode OGLE Cepheids additional modes Virtual Observatory Resource

Authors
  1. Suveges M.
  2. Anderson R.I.
  3. Published by
    CDS
Abstract

Detailed knowledge of the variability of classical Cepheids, in particular their modulations and mode composition, provides crucial insight into stellar structure and pulsation. However, tiny modulations of the dominant radial-mode pulsation were recently found to be very frequent, possibly ubiquitous in Cepheids, which makes secondary modes difficult to detect and analyse, since these modulations can easily mask the potentially weak secondary modes. The aim of this study is to re-investigate the secondary mode content in the sample of OGLE-III and OGLE-IV single-mode classical Cepheids using kernel regression with adaptive kernel width for pre-whitening, instead of using a constant-parameter model. This leads to a more precise removal of the modulated dominant pulsation, and enables a more complete survey of secondary modes with frequencies outside a narrow range around the primary. Our analysis reveals that significant secondary modes occur more frequently among first overtone Cepheids than previously thought. The mode composition appears significantly different in the Large and Small Magellanic Clouds, suggesting a possible dependence on chemical composition. In addition to the formerly identified non-radial mode at P_2_~=0.6...0.65P_1_ (0.62-mode), and a cluster of modes with near-primary frequency, we find two more candidate non-radial modes. One is a numerous group of secondary modes with P_2_~=1.25P_1_, which may represent the fundamental of the 0.62-mode, supposed to be the first harmonic of an l {in} {7, 8, 9} non-radial mode. The other new mode is at P_2_ ~=1.46P_1_, possibly analogous to a similar, rare mode recently discovered among first overtone RR Lyrae stars.

Keywords
  1. Magellanic Clouds
  2. Variable stars
Bibliographic source Bibcode
2018MNRAS.478.1425S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/478/1425
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/478/1425

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/478/1425
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/478/1425
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/478/1425
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/478/1425/smc?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/478/1425/smc?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/478/1425/smc?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/478/1425/lmc?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/478/1425/lmc?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/478/1425/lmc?

History

2021-08-20T14:37:25Z
Resource record created
2021-08-20T14:37:25Z
Created
2022-07-19T07:31:54Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr