J/A+A/682/A88 LSP in ASAS-SN and Gaia (Pawlak+, 2024)
Investigating the long secondary period phenomenon with the ASAS-SN and
Gaia data.
Pawlak M., Trabucchi M., Eyer L., Mowlavi N.
<Astron. Astrophys. 682, A88 (2024)>
=2024A&A...682A..88P 2024A&A...682A..88P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Optical ; Stars, giant
Keywords: stars: AGB and post-AGB - pulsars: general - stars: variables: general
Abstract:
The aim of this work is to create a complete list of sources
exhibiting a long secondary period (LSP) in the ASAS-SN catalog of
variable stars, and analyze the properties of this sample compared to
other long period variables without an LSP.
We used the period-amplitude diagram to identify the 55572 stars
showing an LSP, corresponding to 27% of the pulsating red giants in
the catalog. We used astrometric data from Gaia DR3 and spectroscopic
data provided by the APOGEE, GALAH, and RAVE surveys to investigate
the statistical properties of the sample.
We find that stars displaying an LSP have a spatial distribution that
is more dispersed than that of the non-LSP giants, suggesting that
they belong to an older population. Spectroscopically derived ages
seem to confirm this. The stars with an LSP also appear to be
different in terms of the C/O ratio from their non-LSP counterparts.
Description:
For the purpose of this study we used the ASAS-SN Catalog of Variable
Stars containing 194840 LPVs (Jayasinghe et al. 2018MNRAS.477.3145J 2018MNRAS.477.3145J,
2019MNRAS.486.1907J 2019MNRAS.486.1907J, 2019MNRAS.485..961J 2019MNRAS.485..961J; Cat. II/366). The sample
includes both semi-regular as well as OGLE small-amplitude red giant
(OSARG) type variables. We crossmatched this catalog with the Gaia DR3
catalog (Gaia Collaboration 2021, Cat. I/350), obtaining 186 583
matches.
The criterion we used to select LSP stars was A<1.6 log(P)-3.7, where
P is the strongest period in days and A is the V-band peak-to-peak
amplitude in magnitudes.
We present the list of identified LSPs, together with all three
identified periods, including their pulsational and long periods.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 155 55573 The catalog of the LSP stars
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 28 A28 --- ASASSN ASAS-SN ID (ASASSN-V JNNMMSS.ss+DDMMSS.s)
30- 48 I19 --- GaiaEDR3 ? Gaia EDR3 source ID
50- 61 F12.8 d P1 1st harmonic period
63- 69 F7.5 mag A1 Amplitude of P1
71- 82 F12.8 d P2 2st harmonic period
84- 90 F7.5 mag A2 AMplitude of P2
92-103 F12.8 d P3 1st harmonic period
105-111 F7.5 mag A3 Amplitude of P3
113-124 F12.8 d Ppuls Pulsational period
126-132 F7.5 mag Apuls Amplitude of Ppuls
134-145 F12.8 d Plsp Long secondary period (LSP)
147-153 F7.5 mag Alsp Amplitude of Plsp
155 I1 --- LSP-Per-Nr [1/3] Harmonic number of the LSP
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Acknowledgements:
Michal Pawlak, michal.pawlak(at)fysik.lu.se
(End) Patricia Vannier [CDS] 05-Dec-2023