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.
<Astron. J., 130, 776-788 (2005)>
=2005AJ....130..776T 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.
II/250) 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:
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FileName Lrecl Records Explanations
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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
2σ above the measurement error
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See also:
II/250 : Combined General Catalogue of Variable Stars (Samus+ 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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 σ 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
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Note (1): Defined as dP/dt/P, where dP/dt and P are obtained from the
linear fit.
Note (2): Defined as (Pmax-Pmin)/Per. The error in dlnP is
approximately constant at ∼0.04.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 26-Oct-2005