BV Observations of the Long-Period Cepheid S Vulpeculae

Heiser, A. M.

doi:10.1086/133771

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Characteristic Values Of the Atmospheric Parameters1

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2005

2022

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Cited by 2 publications

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“…Figure 2 also makes us suspect that we do not have data for S Vul at minimum temperature. The photometric data of Heiser (1996) show that minimum light (which should be very near minimum temperature) for S Vul occurs at phase 0.7, where we have no data. There is a relation between the two for periods up to log P $ 1:2 (16 days), where it appears the minimum temperature reaches attains a constant value for longer periods.…”

Section: Characteristic Values Of the Atmospheric Parametersmentioning

confidence: 55%

Phase-dependent Variation of the Fundamental Parameters of Cepheids. II. Periods Longer than 10 Days

et al. 2005

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Section: Characteristic Values Of the Atmospheric Parametersmentioning

confidence: 55%

Phase-dependent Variation of the Fundamental Parameters of Cepheids. II. Periods Longer than 10 Days

et al. 2005

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Study of changes in the pulsation period of 148 Galactic Cepheid variables

Csörnyei

Szabados

Molnár

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Investigating period changes of classical Cepheids through the framework of O-C diagrams provides a unique insight to the evolution and nature of these variable stars. In this work, the new or extended O − C diagrams for 148 Galactic classical Cepheids are presented. By correlating the calculated period change rates with the Gaia EDR3 colours, we obtain observational indications for the non-negligible dependence of the period change rate on the horizontal position within the instability strip. We find period fluctuations in 59 Cepheids with a confidence level of 99 per cent, which are distributed uniformly over the inspected period range. Correlating the fluctuation amplitude with the pulsation period yields a clear dependence, similar to the one valid for longer period pulsating variable stars. The non-negligible amount of Cepheids showing changes in their O − C diagrams that are not or not only of evolutionary origin points toward the need for further studies for the complete understanding of these effects. One such peculiar behaviour is the large amplitude period fluctuation in short period Cepheids, which occurs in a significant fraction of the investigated stars. The period dependence of the fluctuation strength and its minimum at the bump Cepheid region suggests a stability enhancing mechanism for this period range, which agrees with current pulsation models.

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BV Observations of the Long-Period Cepheid S Vulpeculae

Cited by 2 publications

References 7 publications

Phase-dependent Variation of the Fundamental Parameters of Cepheids. II. Periods Longer than 10 Days

Phase-dependent Variation of the Fundamental Parameters of Cepheids. II. Periods Longer than 10 Days

Study of changes in the pulsation period of 148 Galactic Cepheid variables

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