J/AJ/130/776 Secular evolution in Mira variable pulsations (Templeton+, 2005) ================================================================================ Secular evolution in Mira variable pulsations. Templeton M.R., Mattei J.A., Willson L.A. =2005AJ....130..776T ================================================================================ ADC_Keywords: Stars, variable Keywords: astronomical data bases: miscellaneous - stars: AGB and post-AGB - stars: evolution - stars: mass loss - stars: oscillations - stars: variables: other Abstract: In this paper we present the results of our study of period change in 547 Mira variables using data from the AAVSO (American Association of Variable Star Observers). We use wavelet analysis to measure the period changes in individual Mira stars over the span of available data. By making linear fits to the period versus time measurements, we determine the average rates of period change, d(lnP)/dt, for each of these stars. Description: In this work we make use of visual magnitude estimates collected and archived by the AAVSO. We selected stars for analysis based on two criteria: the AAVSO International Database must contain at least 500 valid data points for the star, and the most recent version of the General Catalogue of Variable Stars (GCVS; Kholopov 1990, Cat. ) must classify the object as Mira (M) or suspected Mira (M:). Using these criteria, the data for 547 stars were selected from the AAVSO ID. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 49 547 Measured periods and rates of period change for 57 Mira stars with d(lnP)/dt greater than 2{sigma} above the measurement error -------------------------------------------------------------------------------- See also: II/250 : Combined General Catalogue of Variable Stars (Samus+ 2004) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 A9 --- Name Mira star name 11- 16 F6.2 d Per Measured period 18- 21 F4.2 d e_Per Uncertainty in Per 23- 27 F5.2 10-3/yr dlnP/dt Average rate of period change (1) 29- 32 F4.2 10-3/yr e_dlnP/dt Uncertainty in dlnP/dt 34- 38 F5.2 --- Signif Number of {sigma} above the significance level 40- 43 F4.2 --- dlnP Period change (2) 45- 48 I4 yr 1/(dlnP/dt) ? Inverse of the average rate of period change -------------------------------------------------------------------------------- Note (1): Defined as dP/dt/P, where dP/dt and P are obtained from the linear fit. Note (2): Defined as (P_max_-P_min_)/Per. The error in dlnP is approximately constant at ~0.04. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Marianne Brouty [CDS] 26-Oct-2005