New Method to Recognize s-Cepheids
Abstract
A new method of delineating sinusoidal or s-Cepheids is presented. The methos uses the values of (V) (the mean intensity), V - Bar (the average magnitude), and Vmean (the value of the mean magnitude). Fourier coefficient data from galactic Cepheids is used to derive these terms in the V band and the differences between the various terms show systematic trends with increasing period. The Cepheids can be easily grouped into 3 divisions-short period s-Cepheids, intermediate period Cepheids (P less than 9 days), and long period Cepheids (P greater than 9 days). Cepheids previously designated as s-Cepheids by others are compared to those found using the method outlined here. The method is also applied to Cepheids in the Small Magellanic Cloud to examine its suitability as a pulsation mode discriminator.
- Publication:
-
The Astronomical Journal
- Pub Date:
- March 1995
- DOI:
- 10.1086/117358
- Bibcode:
- 1995AJ....109.1263M
- Keywords:
-
- Categories;
- Cepheid Variables;
- Cycles;
- Light Curve;
- Recognition;
- Sine Waves;
- Time Functions;
- Amplitudes;
- Average;
- Data Reduction;
- Mean;
- Pulses;
- Stellar Magnitude;
- Astronomy;
- CEPHEIDS;
- STARS: OSCILLATIONS