OGLE-GAL-ACEP-091: The First Known Multi-mode Anomalous Cepheid

Soszyński, I.; Smolec, R.; Udalski, A.; Szymański, M. K.; Pietrukowicz, P.; Skowron, D. M.; Skowron, J.; Mróz, P.; Poleski, R.; Kozłowski, S.; Iwanek, P.; Wrona, Marcin; Gromadzki, M.; Ulaczyk, K.; Rybicki, K.

doi:10.3847/2041-8213/abb817

Cited by 8 publications

(9 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The OGLE F/1O and 1O/2O Cepheids occupy specific loci in the Petersen diagram, such that their period ratios lie between 0.65 and 0.85 (Soszyński et al 2020a). For the Galactic double-mode Cepheids included in the OGLE catalog (Soszyński et al 2017(Soszyński et al , 2020bUdalski et al 2018), sources with period ratios > 0.769 were classified as 1O/2O and those with period ratios < 0.769 were classified as F/1O double-mode Cepheids. We used the same selection criteria to classify our ZTF-based sample of double-mode Cepheid candidates.…”

Section: Methodsmentioning

confidence: 99%

“…Multi-mode Cepheids in the Milky Way are more valuable, but their number included only a few dozen objects prior to 2018. Since then, the Optical Gravitational Lensing Experiment's (OGLE) catalog (Soszyński et al 2017(Soszyński et al , 2020bUdalski et al 2018) now contains 1973 Cepheids located in the Milky Way's bulge and disk. Approximately 11% (209) of these Cepheids are F/1O and 1O/2O double-mode Cepheids (Soszyński et al 2020a).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Double Mode Cepheids from the Zwicky Transient Facility Survey

Shah,

Chen,

de Grijs

2022

Preprint

View full text Add to dashboard Cite

Multi-mode Cepheids pulsate simultaneously in more than one mode of oscillation. They provide an independent means to test stellar models and pulsation theories. They can also be used to derive metallicities. In recent years, the number of known multi-mode Cepheids has increased dramatically with the discovery of a large number of Galactic double-mode Cepheids. To date, 209 double-mode Cepheids have been detected in the Galactic bulge and disk, mostly based on the Optical Gravitational Lensing Experiment's (OGLE) catalog. In this paper, we conduct a comprehensive search for doublemode Cepheids in the northern sky based on Zwicky Transient Facility Data Release 5. We found 72 such objects in the Milky Way. The periods of the 30 sample objects already included in the OGLE catalog show excellent agreement with the OGLE periods. The period ratios of our new Cepheids are consistent with those of known double-mode Cepheids, as evidenced by their loci in the so-called 'Petersen diagram'. Compared with OGLE, the completeness of our double-mode Cepheid sample is around 71%. The much improved temporal sampling of the Zwicky Transient Facility offers significant scope to find more double-mode Cepheids, especially at the distribution's short-period end.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Double Mode Cepheids from the Zwicky Transient Facility Survey

Shah,

Chen,

de Grijs

2022

Preprint

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 99%

“…The period ratios of the F/1O double-mode Cepheids in the Milky Way, the Large Magellanic Cloud (LMC), and the Small Magellanic Cloud (SMC) are different, that is, Cepheids in those galaxies occupy different regions in the so-called "Petersen diagram" (Petersen 1973), as a result of their different metallicities (Buchler & Szabó 2007). The Petersen diagram covers the parameter space defined by the ratio of the shorter to the longer period versus the logarithm of the longer period (Soszyński et al 2017(Soszyński et al , 2020bUdalski et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Multimode Cepheids in the Milky Way are more valuable, but their number included only a few dozen objects prior to 2018. Since then, the Optical Gravitational Lensing Experiment's (OGLE) catalog (Soszyński et al 2017(Soszyński et al , 2020bUdalski et al 2018) (Jayasinghe et al 2018(Jayasinghe et al , 2020). NASA's Transiting Exoplanet Survey Satellite data is suitable to find multimode Cepheids with smaller amplitudes (Plachy et al 2021).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Double-mode Cepheids from the Zwicky Transient Facility Survey

Shah¹,

Chen²,

Grijs³

2022

View full text Add to dashboard Cite

Multimode Cepheids pulsate simultaneously in more than one mode of oscillation. They provide an independent means to test stellar models and pulsation theories. They can also be used to derive metallicities. In recent years, the number of known multimode Cepheids has increased dramatically with the discovery of a large number of Galactic double-mode Cepheids. To date, 209 double-mode Cepheids have been detected in the Galactic bulge and disk, mostly based on the Optical Gravitational Lensing Experiment’s (OGLE) catalog. In this paper, we conduct a comprehensive search for double-mode Cepheids in the northern sky based on Zwicky Transient Facility Data Release 5. We found 72 such objects in the Milky Way. The periods of the 30 sample objects already included in the OGLE catalog show excellent agreement with the OGLE periods. The period ratios of our new Cepheids are consistent with those of known double-mode Cepheids, as evidenced by their loci in the so-called “Petersen diagram.” Compared with OGLE, the completeness of our double-mode Cepheid sample is around 71%. The much improved temporal sampling of the Zwicky Transient Facility offers significant scope to find more double-mode Cepheids, especially at the distribution’s short-period end.

show abstract

Cepheids as distance indicators and stellar tracers

Bono,

Braga,

Pietrinferni

2024

Astron Astrophys Rev

View full text Add to dashboard Cite

We review the phenomenology of classical Cepheids (CCs), Anomalous Cepheids (ACs) and type II Cepheids (TIICs) in the Milky Way (MW) and in the Magellanic Clouds (MCs). We also examine the Hertzsprung progression in different stellar systems by using the shape of I-band light curves (Fourier parameters) and observables based on the difference in magnitude and in phase between the bump and the minimum in luminosity. The distribution of Cepheids in optical and in optical–near infrared (NIR) color–magnitude diagrams is investigated to constrain the topology of the instability strip. The use of Cepheids as tracers of young (CCs), intermediate (ACs) and old (TIICs) stellar populations are brought forward by the comparison between observations (MCs) and cluster isochrones covering a broad range in stellar ages and in chemical compositions. The different diagnostics adopted to estimate individual distances (period–luminosity, period–Wesenheit, period–luminosity–color relations) are reviewed together with pros and cons in the use of fundamental and overtones, optical and NIR photometric bands, and reddening free pseudo magnitudes (Wesenheit). We also discuss the use of CCs as stellar tracers and the radial gradients among the different groups of elements (iron, $$\alpha $$ α , neutron-capture) together with their age-dependence. Finally, we briefly outline the role that near-future space and ground-based facilities will play in the astrophysical and cosmological use of Cepheids.

show abstract

OGLE-GAL-ACEP-091: The First Known Multi-mode Anomalous Cepheid

Cited by 8 publications

References 27 publications

Double Mode Cepheids from the Zwicky Transient Facility Survey

Double Mode Cepheids from the Zwicky Transient Facility Survey

Double-mode Cepheids from the Zwicky Transient Facility Survey

Cepheids as distance indicators and stellar tracers

Contact Info

Product

Resources

About