J/ApJ/922/199 Times of maximum light & O-C values of GSC 4552-1498 (Sun+, 2021)
Asteroseismology of a high-amplitude δ Scuti star GSC 4552-1498: mode
identification and model fitting.
Sun X.-Y., Zuo Z.-Y., Yang T.-Z., Chen X.-H., Li H.-R.
<Astrophys. J., 922, 199 (2021)>
=2021ApJ...922..199S 2021ApJ...922..199S
ADC_Keywords: Stars, variable; Optical; Asteroseismology
Keywords: Stellar oscillations ; Delta Scuti variable stars
Abstract:
In this paper, the pulsation behavior of high-amplitude δ Scuti
star GSC 4552-1498 was analyzed. Using the high-precision photometric
data from the Transiting Exoplanet Survey Satellite, two new
independent frequencies F1=22.6424(1)day-1 and F2=28.6803(5)day-1
were identified for this source, along with the fundamental one
F=17.9176(7)day-1, which was previously known. In addition, the
classical O-C analysis was conducted to give a new ephemeris formula
of BJDmax=T0+P*E=2453321.534716(4)+0.055811(0)*E. The O-C diagram
reveals a continuous period increase, but the rate of
(1/P)(dP/dt)=1.11(3)x10-7yr-1 seems much larger (about hundreds)
than predicted by evolution theories, which is long been noticed but
not well understood, possibly related to nonlinear mode interaction.
Based on frequency parameters (i.e., F, F1, and F2), a series of
theoretical models were conducted by employing the stellar evolution
code. It turns out that F1 should be a non-radial mode and F2 is the
second overtone radial mode. Due to the mass-metallicity degeneracy,
the stellar parameter of the star can however not be determined
conclusively. We suggest high-resolution spectral observation is
highly desired in the future to further constrain models. We note
GSC4552-1498 is located on the main sequence in the H-R diagram.
Description:
GSC 4552-1498 was observed by the Transiting Exoplanet Survey
Satellite (TESS) during Sectors 14, 20, and 21, from
BJD 2458683.346-2458897.782 in 2min cadence. All the data were
downloaded from TESS Asteroseismic Science Operations Center (TASOC)
database.
Objects:
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RA (ICRS) DE Designation(s) (Per)
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11 24 25.34 +77 42 15.6 GSC 4552-1498 = V* V451 Dra (P=0.0558d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 25 1102 1102 new times of maximum light and O-C values of
GSC 4552-1498
table5.dat 27 79 79 previous times of maximum light and O-C values
of GSC 4552-1498
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
J/A+A/534/A125 : Variability of A- & F-stars from Kepler (Uytterhoeven+ 2011)
J/MNRAS/439/2078 : High-frequency A-type pulsators (Holdsworth+, 2014)
J/MNRAS/460/1970 : Kepler δ Sct stars amp. modulation (Bowman+, 2016)
J/MNRAS/475/478 : delta Scuti pulsating stars LAMOST views (Qian+, 2018)
J/MNRAS/490/4040 : δ Scuti & γ Dor stars in TESS (Antoci+, 2019)
J/A+A/638/A59 : delta Scuti stars with TESS (Barcelo Forteza+, 2020)
J/AJ/161/27 : O-C values of KIC10975348 with Kepler (Yang+, 2021)
http://tasoc.dk/ : TESS Asteroseismic Science Operations Center home page
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 d BJD [8683.4/8897.8] Barycentric Julian Date;
BJD-2450000 (G1)
11- 15 I5 --- E [96072/99912] Cyle number (G2)
17- 25 F9.6 d O-C [-0.00065/0.00053] O-C (G2)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 d BJD [3321.5/6968.4] Barycentric Julian Date;
BJD-2450000 (G1)
11- 15 I5 --- E [0/65342] Cyle number (G2)
17- 25 F9.6 d O-C [-0.0012/0.0018] O-C (G2)
27- 27 I1 --- Ref [1/6] Reference (1)
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Note (1): Sources of previous times as follows:
1 = Wils et al. (2009IBVS.5878....1W 2009IBVS.5878....1W)
2 = Wils et al. (2012IBVS.6015....1W 2012IBVS.6015....1W)
3 = Wils et al. (2013IBVS.6049....1W 2013IBVS.6049....1W)
4 = Wils et al. (2014IBVS.6122....1W 2014IBVS.6122....1W)
5 = Wils et al. (2015IBVS.6150....1W 2015IBVS.6150....1W)
6 = Jafarzadeh & Poro (2017NewA...54...86J 2017NewA...54...86J)
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Global notes:
Note (G1): Time is the observed times of maximum light for GSC 4552-1498
Note (G2): E and O-C are based on the ephemeris formula:
BJDmax=T0+P*E=2453321.534716(4)+0.055811(0)*E.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 30-Mar-2023