RECORD
Structural Properties of s-Cepheid Velocity Curves
Astrophysics · Submitted 14 Jul 1998
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The center of the omega_4 = 2 omega_1 resonance is estimated to occur at P_r = 4.58+-0.04 day, i.e. at a period considerably longer than previously assumed (3.2 day).
The compiled record
The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.
Open the compiled record
The abstract, sentence by sentence
The light curves of the first overtone Pop. I Cepheids (s-Cepheids) show a discontinuity in their phi_21 vs. P diagram, near P=3.2 day. This feature, commonly attributed to the 2:1 resonance between the first and the fourth overtones (omega_4=2 omega_1), is not reproduced by the hydrodynamical models. With the goal of reexamining the resonance hypothesis, we have obtained new CORAVEL radial velocity curves for 14 overtone Cepheids. Together with 10 objects of Krzyt et al. (1999), the combined sample covers the whole range of overtone Cepheid periods. The velocity Fourier parameters display a strong characteristic resonant behavior. In striking contrast to photometric ones, they vary smoothly with the pulsation period and show no jump at 3.2 day. The existing radiative hydrodynamical models match the velocity parameters very well. The center of the omega_4 = 2 omega_1 resonance is estimated to occur at P_r = 4.58+-0.04 day, i.e. at a period considerably longer than previously assumed (3.2 day). We identify two new members of the s-Cepheid group: MY Pup and V440 Per.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The light curves of the first overtone Pop. | background 0.98 | 0.05 | 0.01 | unclear 0.93 |
| s1 | I Cepheids (s-Cepheids) show a discontinuity in their phi_21 vs. P diagram, near P=3.2 day. | background 0.88 | 0.28 | 0.08 | asserted 1.00 |
| s2 | This feature, commonly attributed to the 2:1 resonance between the first and the fourth overtones (omega_4=2 omega_1), is not reproduced by the hydrodynamical models. | background 0.80 | 0.18 | 0.12 | asserted 1.00 |
| s3 | With the goal of reexamining the resonance hypothesis, we have obtained new CORAVEL radial velocity curves for 14 overtone Cepheids. | method 0.65 | 0.96 | 0.03 | asserted 0.99 |
| s4 | Together with 10 objects of Krzyt et al. (1999), the combined sample covers the whole range of overtone Cepheid periods. | method 0.82 | 0.53 | 0.02 | asserted 1.00 |
| s5 | The velocity Fourier parameters display a strong characteristic resonant behavior. | result 0.99 | 0.80 | 0.13 | asserted 1.00 |
| s6 | In striking contrast to photometric ones, they vary smoothly with the pulsation period and show no jump at 3.2 day. | result 1.00 | 0.83 | 0.24 | asserted 1.00 |
| s7 | The existing radiative hydrodynamical models match the velocity parameters very well. | result 0.94 | 0.27 | 0.13 | asserted 1.00 |
| s8 | The center of the omega_4 = 2 omega_1 resonance is estimated to occur at P_r = 4.58+-0.04 day, i.e. at a period considerably longer than previously assumed (3.2 day). | result 0.98 | 0.89 | 0.63 | asserted 1.00 |
| s9 | We identify two new members of the s-Cepheid group: MY Pup and V440 Per. | result 0.68 | 0.94 | 0.05 | asserted 1.00 |
What was examined, and what was not
- arXiv listing abstract v2
- full text
- figures and tables
- references and citing sentences
- relations to other papers
- P abstract
- S sections
- T body sentences
- C citations
- R cross-paper relations
The paper
Original abstract
The light curves of the first overtone Pop. I Cepheids (s-Cepheids) show a discontinuity in their phi_21 vs. P diagram, near P=3.2 day. This feature, commonly attributed to the 2:1 resonance between the first and the fourth overtones (omega_4=2 omega_1), is not reproduced by the hydrodynamical models. With the goal of reexamining the resonance hypothesis, we have obtained new CORAVEL radial velocity curves for 14 overtone Cepheids. Together with 10 objects of Krzyt et al. (1999), the combined sample covers the whole range of overtone Cepheid periods. The velocity Fourier parameters display a strong characteristic resonant behavior. In striking contrast to photometric ones, they vary smoothly with the pulsation period and show no jump at 3.2 day. The existing radiative hydrodynamical models match the velocity parameters very well. The center of the omega_4 = 2 omega_1 resonance is estimated to occur at P_r = 4.58+-0.04 day, i.e. at a period considerably longer than previously assumed (3.2 day). We identify two new members of the s-Cepheid group: MY Pup and V440 Per.
Human review
Discussion
Know something about this paper? Leave a comment, or highlight any passage above to comment on it.