2024MNRAS.534.3211S

Query : 2024MNRAS.534.3211S

2024MNRAS.534.3211S - Mon. Not. R. Astron. Soc., 534, 3211-3220 (2024/November-2)

Asteroseismology of the mild Am δ Sct star HD 118660: TESS photometry and modelling.

SARKAR M., JOSHI S., DUPRET M.-A., TRUST O., DE CAT P., SEMENKO E., LAMPENS P., GOSWAMI A., MKRTICHIAN D., KARINKUZHI D., YAKUNIN I. and GUPTA A.

Abstract (from CDS):

We present the results of an asteroseismic study of HD 118660 (TIC 171729860), being a chemically peculiar (mild Am) star exhibiting $\delta$ Scuti ($\delta$ Sct) pulsations. It is based on the analysis of two sectors of time-series photometry from the space mission TESS (Transiting Exoplanet Survey Satellite) and seismic modelling. It yielded the detection of 15 and 16 frequencies for TESS sectors 23 and 50, respectively. The identified pulsation modes include four radial ($\ell =0$) and five dipolar ($\ell =1$) ones. The radial modes are overtones with order n ranging from 3 and 6. Such high values of n are theoretically not expected for stars with the effective temperature of HD 118660 ($T_{\rm eff}\approx 7550\,\rm K$) located near the red edge of the $\delta$ Sct instability strip. To estimate the asteroseismic parameters, we have generated a grid of stellar models assuming a solar metallicity ($Z=0.014$) and different values for the convective overshooting parameter ($0.1\le \alpha _{\rm ov}\le 0.3$). We conclude that the analysis of the radial modes is insufficient to constrain $\alpha _{\rm ov}$ and Z for $\delta$ Sct stars. The value for the equatorial velocity of HD 118660 derived from the seismic radius and the rotational frequency is consistent with values found in the literature.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): asteroseismology - convection - diffusion - stars: activity - stars: chemically peculiar - stars: evolution

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 118660 * 13 38 07.8883267440 +14 18 06.932355120   6.750 6.489     A9Vs 59 0

Query : 2024MNRAS.534.3211S

Basic data :
HD 118660 -- Star
Other object types: otypes_help 		* (HD,AG,...), UV (TD1), NIR (2MASS)
ICRS coord. (ep=J2000) : 		13 38 07.8883267440 +14 18 06.932355120 (Optical) [ 0.0198 0.0181 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		13 35 41.0380599686 +14 33 21.572060618 [ 0.0198 0.0181 90 ]
Gal coord. (ep=J2000) : 		345.5798760621585 +73.1783530446400 [ 0.0198 0.0181 90 ]
Proper motions mas/yr : 		40.801 -15.196 [0.029 0.023 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -1.7 [2] / z(~) -0.000006 [0.000007] / cz -1.70 [2.00]
   E 1953GCRV..C......0W
Parallaxes (mas): 		14.2029 [0.0275] A 2020yCat.1350....0G
Spectral type: 		A9Vs C ~
Fluxes (6) :
B 6.750 [0.015] D 2000A&A...355L..27H
V 6.489 [0.010] D 2000A&A...355L..27H
G 6.446406 [0.002763] C 2020yCat.1350....0G
J 5.973 [0.020] C 2003yCat.2246....0C
H 5.890 [0.017] C 2003yCat.2246....0C
K 5.853 [0.017] C 2003yCat.2246....0C
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Identifiers (27) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 118660 HIC 66522 SAO 100644 WEB 11742
AG+14 1390 HIP 66522 SKY# 25075 YZ 0 1371
BD+15 2602 HR 5129 TD1 16969 YZ 14 4896
GC 18434 2MASS J13380788+1418070 TIC 171729860 Gaia DR2 3741537365224765056
GCRV 8066 PPM 129964 TYC 899-931-1 Gaia DR3 3741537365224765056
GEN# +1.00118660 Renson 34276 UBV M 19583 Gaia DR1 3741537360928761216
GSC 00899-00931 ROT 7270 uvby98 100118660

References (59 between 1850 and 2026) (Total 59)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 4    Distance : 2    Rot : 5    Fe/H : 2    Plx : 5    PM : 4    SpT : 3   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Link by name to the catalogue in VizieR :

HD 118660 AG+14 1390 BD+15 2602 GSC 00899-00931 HIC 66522
HIP 66522 HR 5129 2MASS J13380788+1418070 PPM 129964 SAO 100644
TD1 16969 TYC 899-931-1 uvby98 100118660 Gaia DR2 3741537365224765056 Gaia DR3 3741537365224765056
Gaia DR1 3741537360928761216

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