2023AJ....166...43N

Query : 2023AJ....166...43N

2023AJ....166...43N - Astron. J., 166, 43 (2023/August-0)

Uncorrelated Amplitude and Frequency Variations of the Harmonics in SX Phoenicis Star XX Cygni.

NIU J.-S., LIU Y. and XUE H.-F.

Abstract (from CDS):

Harmonics are quite common in pulsating stars. They are always considered to mimic the behaviors of their independent parent pulsation modes, and are not taken for key information in asteroseismology. Here, we report an SX Phoenicis star XX Cygni, whose periodogram is dominated by the fundamental frequency f0 = 7.41481 ± 0.00004 c day–1 and its 19 harmonics. According to the analysis of the archival data from the Transiting Exoplanet Survey Satellite (TESS), we find that both the amplitudes and frequencies of the fundamental mode and the harmonics vary within TESS Sectors 14-17 and 54-57, which might be caused by the contamination of neighboring stars. What is more interesting is that the harmonics show significantly uncorrelated amplitude and frequency variations over time. Some possible origins and interesting issues are proposed to scheme further research of this hidden corner in current asteroseismology.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Pulsating variable stars - Stellar pulsations - SX Phoenicis variable stars

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 V* XX Cyg SX* 20 03 15.6420308880 +58 57 16.525249632   11.99 11.86     A5-F5 127 0

Query : 2023AJ....166...43N

Basic data :
V* XX Cyg -- SX Phe Variable
Other object types: otypes_help 		* (HIP,CSI,...), V* (AN,V*,...), SX* (2003AstL), RR* (2009AJ), Pu* (2018AJ), NIR (2MASS), Opt (ATO)
ICRS coord. (ep=J2000) : 		20 03 15.6420308880 +58 57 16.525249632 (Optical) [ 0.0166 0.0160 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		20 02 17.0716752105 +58 48 44.667218503 [ 0.0166 0.0160 90 ]
Gal coord. (ep=J2000) : 		092.4958172850758 +14.4285463614539 [ 0.0166 0.0160 90 ]
Proper motions mas/yr : 		-6.821 7.217 [0.020 0.021 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -135.00 [7.4] / z(~) -0.000450 [0.000025] / cz -134.97 [7.40]
   D 2007AN....328..889K
Parallaxes (mas): 		0.8599 [0.0171] A 2020yCat.1350....0G
Spectral type: 		A5-F5 D 2012AJ....144...92Y
Fluxes (6) :
B 11.99 [0.10] D 2000A&A...355L..27H
V 11.86 [0.14] D 2000A&A...355L..27H
G 11.854162 [0.011338] C 2020yCat.1350....0G
J 11.280 [0.021] C 2003yCat.2246....0C
H 11.120 [0.025] C 2003yCat.2246....0C
K 11.044 [0.020] C 2003yCat.2246....0C
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Identifiers (19) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HIP 98737 GSC 03948-02144 TIC 233310793 AAVSO 2001+58
AN 14.1904 GSC 03948-02590 TYC 3948-2590-1 Gaia DR3 2236404593612248064
ATO J300.8151+58.9546 HIC 98737 uvby98 653102424 V Gaia DR1 2236404589312109440
CSI+58-20023 2MASS J20031565+5857165 V* XX Cyg Gaia DR2 2236404589312109440
GCRV 12434 NSVS 3101156 WEB 17490

References (127 between 1850 and 2026) (Total 127)
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    Var : 2    Rot : 1    Plx : 5    PM : 4   

   

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Link by name to the catalogue in VizieR :

HIP 98737 GSC 03948-02144 GSC 03948-02590 HIC 98737 2MASS J20031565+5857165
TYC 3948-2590-1 uvby98 653102424 V V* XX Cyg Gaia DR3 2236404593612248064 Gaia DR1 2236404589312109440
Gaia DR2 2236404589312109440

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