J/MNRAS/513/374 alpha Per delta Scuti significant freq. (Pamos Ortega+, 2022)
Determining the seismic age of the young open cluster alpha Per using
delta Scuti stars.
Pamos Ortega D., Garcia Hernandez A., Suarez J.C., Pascual Granado J.,
Forteza S., Rodon J.R.
<Mon. Not. R. Astron. Soc. 513, 374-388 (2022)>
=2022MNRAS.513..374P 2022MNRAS.513..374P (SIMBAD/NED BibCode)
ADC_Keywords: Asteroseismology ; Clusters, open ; Stars, variable
Keywords: miscellaneous - asteroseismology - astronomical data bases -
software: data analysis - stars: rotation -
stars: variables: delta Scuti - galaxies: star formation
Abstract:
In this work we aim at constraining the age of the young open cluster
Melotte 20, known as α Per, using seismic indices. The method
consists of the following steps: 1) Extract the frequency content of a
sample of stars in the field of an open cluster. 2) Search for
possible regularities in the frequency spectra of δ Sct stars
candidates, using different techniques, such as the Fourier transform,
the autocorrelation function, the histogram of frequency differences
and the echelle diagram. 3) Constrain the age of the selected stars
by both the physical parameters and seismic indices by comparing them
with a grid of asteroseismic models representative of δ Sct
stars. 4) Find possible common ages between these stars to determine
the age of the cluster. We performed the pulsation analysis with
MultiModes, a rapid, accurate and powerful open-source code, which is
presented in this paper. The result is that the age of α Per
could be between 96 and 100 Myr. This is an improvement over different
techniques in the past. We the refore show that space astroseismology
is capable of taking important steps in the dating of young open
clusters.
Description:
We tabulate the most significant frequencies from eleven Delta Scuti
stars, located in the field of the young open cluster, alpha Per. The
have been extracted using the new python code MultiModes, an efficient
tool for massive analysis of pulsating stars, in terms of computing
time.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 43 11 List of studied stars
table.dat 71 1276 Most significant frequencies from eleven
delta Scuti stars
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See also:
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
J/ApJ/752/58 : alpha Per cluster members (Zuckerman+, 2012)
J/MNRAS/457/1028 : alpha Per cluster possible members (Sheikhi+, 2016)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Name (TIC NNNNNNNNN)
15- 16 I2 h RAh Right ascension (J2000)
18- 19 I2 min RAm Right ascension (J2000)
21- 25 F5.2 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 38 F5.2 arcsec DEs Declination (J2000)
41- 43 I3 --- N Number of frequencies in table.dat
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Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Name (TIC NNNNNNNNN)
15- 22 F8.5 d-1 Freq Frequency
24- 31 F8.6 mmag Amp Amplitude
33- 39 F7.5 --- Phase Phase
41- 47 F7.5 d-1 e_Freq Minimum frequency error (1)
50- 57 E8.3 mmag e_Amp Minimum amplitude error (1)
59- 65 F7.5 --- e_Phase Minimum phase error (1)
67- 71 F5.1 --- S/N Signal to Noise
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Note (1): From Montgomery, M.H.; Odonoghue, D. Delta Scuti Star Newsletter,
vol. 13, p.28 July 1999 =1999DSSN...13...28M 1999DSSN...13...28M.
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Acknowledgements:
David Pamos Ortega, davidpamos(at)correo.ugr.es
(End) Patricia Vannier [CDS] 29-Apr-2022