scholarly journals MAGELLANIC CLOUDS. XVII. SEVEN NOTES ON THE CEPHEID VARIABLES

1955 ◽  
Vol 41 (11) ◽  
pp. 829-836 ◽  
Author(s):  
H. Shapley ◽  
V. M. Nail
Keyword(s):  
Magellanic Clouds ◽  
Cepheid Variables

Coravel Radial-Velocity Curves for Cepheids in the Large Magellanic Cloud

1984 ◽  
Vol 88 ◽  
pp. 375-380
Author(s):  
M. Imbert ◽  
J. Andersen ◽  
A. Ardeberg ◽  
C. Bardin ◽  
W. Benz ◽  
...  
Keyword(s):  
Comparative Study ◽  
Radial Velocity ◽  
Stellar Evolution ◽  
Large Magellanic Cloud ◽  
Magellanic Clouds ◽  
Independent Determination ◽  
Fundamental Information ◽  
The Galaxy ◽  
Cepheid Variables

Radii and luminosities for Cepheid variables provide fundamental information on stellar evolution. Such data, obtained by the Baade-Wesselink method, are available and have been used for a number of galactic Cepheids. It is of particular interest to obtain corresponding data for Cepheids in the Magellanic Clouds. Firstly, this allows a comparative study of stellar evolution between the Galaxy and the Magellanic Clouds. Secondly, it provides data for an independent determination of the distance to the Magellanic Clouds.Radial-velocity observations have been made for a total of around 20 Cepheid variables in both the LMC and the SMC. All measurements were made with the photoelectric scanner CORAVEL attached to the Cassegrain focus of the Danish 1.54-m telescope at European Southern Observatory, La Silla, Chile. Observations were made from January 1981 through October 1983. The accuracy of individual radial-velocity observations is of the order of 1 km s−1. The B magnitudes of the six Cepheids presented range from 13.0 to 15.5.

scholarly journals Cepheids in the Magellanic Clouds

1991 ◽  
Vol 148 ◽  
pp. 249-257 ◽  
Author(s):  
John A.R. Caldwell ◽  
C. David Laney
Keyword(s):  
Spatial Structure ◽  
Data Base ◽  
Three Dimensional ◽  
Magellanic Clouds ◽  
Cepheid Variables ◽  
Consistent Manner

Cepheid variables provide a key to understanding the structure and distance of the Magellanic Clouds, as well as providing accurate reddenings there. Recent major observing programs have continually expanded the data base of photometry and velocities. It is important to try to reconcile the plethora of Cepheid data into a consonant picture of the three-dimensional spatial structure of the Clouds and to compare in a consistent manner the bulk Cloud distance moduli found by several photometric methods.

scholarly journals Nonradial Pulsations in Classical Cepheids of The Magellanic Clouds

2004 ◽  
Vol 193 ◽  
pp. 498-501 ◽  
Author(s):  
Paweł Moskalik ◽  
Zbigniew Kołaczkowski ◽  
Tomasz Mizerski
Keyword(s):  
Frequency Analysis ◽  
Magellanic Clouds ◽  
Classical Cepheid ◽  
Classical Cepheids ◽  
Cepheid Variables ◽  
Low Amplitude ◽  
Triple Mode ◽  
Nonradial Oscillations

AbstractWe have performed systematic frequency analysis of the LMC Cepheids observed by OGLE project. Several new types of pulsation behaviour are identified, including triple-mode and amplitude-modulated double-mode pulsations. In ~ 10% of the first overtone Cepheids we find low amplitude secondary periodicities corresponding to nonradial modes. This is the first evidence for excitation of nonradial oscillations in Classical Cepheid variables.

scholarly journals Multiwavelength Light-Curve Analysis of Cepheid Variables

2017 ◽  
Vol 14 (S339) ◽  
pp. 287-290
Author(s):  
A. Bhardwaj ◽  
S. M. Kanbur ◽  
M. Marconi ◽  
H. P. Singh ◽  
M. Rejkuba ◽  
...  
Keyword(s):  
Light Curve ◽  
Magellanic Clouds ◽  
Curve Analysis ◽  
Light Curves ◽  
Wide Field ◽  
Light Curve Analysis ◽  
Stellar Pulsation ◽  
The Galaxy ◽  
Cepheid Variables ◽  
Field Variability

AbstractThis poster presented results from a detailed analysis of observed and theoretical light-curves of classical Cepheid variables in the Galaxy and the Magellanic Clouds. The theoretical light-curves were based on non-linear convective hydrodynamical pulsation models; the observational data were taken from ongoing wide-field variability surveys. The variation which we found in theoretical and observed light-curve parameters as a function of period, wavelength and metallicity was used to constrain the input physics to the pulsation models, such as the mass–luminosity relations obeyed by Cepheid variables. We also accounted for the variation in the convective efficiency as entered into the stellar pulsation models and its impact on the theoretical amplitudes and Period-Luminosity relations for Cepheid variables.

scholarly journals Theoretical Distribution of Cepheid Periods in the SMC and LMC

2000 ◽  
Vol 176 ◽  
pp. 250-251 ◽  
Author(s):  
Yann Alibert ◽  
Isabelle Baraffe
Keyword(s):  
Stability Analysis ◽  
Time Scales ◽  
Mass Range ◽  
Mass Function ◽  
Magellanic Clouds ◽  
Theoretical Distribution ◽  
Evolutionary Models ◽  
Evolutionary Time ◽  
Self Consistent ◽  
Cepheid Variables

AbstractWe have computed stellar evolutionary models for stars in a mass range characteristic of Cepheid variables for metallicities representative of the Magellanic Clouds populations. These calculations are coupled to a linear non-adiabatic stability analysis in order to get self-consistent mass-period-luminosity relationships. We construct period histograms taking into account a mass function and evolutionary time scales, and we compare them to those given by the microlensing surveys EROSl and OGLE.

scholarly journals Cepheids in Magellanic Cloud Clusters

1993 ◽  
Vol 139 ◽  
pp. 359-367
Author(s):  
D.L. Welch ◽  
M. Mateo ◽  
E.W. Olszewski
Keyword(s):  
High Precision ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Radial Velocities ◽  
Current Work ◽  
New Technique ◽  
Cloud Clusters ◽  
Cepheid Variables ◽  
A New Technique ◽  
Selection Of

AbstractThe Magellanic Clouds remain an ideal place to study the properties of Cepheid variables. In this paper, we review historical and current work on Cepheids in LMC and SMC clusters, present new results for NGC 1866 and NGC 2164, and describe a new technique for automated selection of Cepheid variables using two-color photometry. We also emphasize the numerous advantages of high-precision radial velocities in the study of Magellanic Cloud variables.

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