1995A&A...295..361V

Query : 1995A&A...295..361V

1995A&A...295..361V - Astronomy and Astrophysics, volume 295361-370 (1995/3-2)

A model for the oscillations of the peculiar Cepheid HR7308.

VAN HOOLST T. and WAELKENS C.

Abstract (from CDS):

HR 7308 is the classical Cepheid with the shortest known period. The oscillation occurs in the second (or a higher) radial overtone and the amplitude of the oscillation varies almost periodically with a modulation period of about 800 oscillation periods. A beating between two closely spaced oscillation modes as an explanation for the variable amplitude has been ruled out on the basis of a theory linear in the amplitudes of the modes. We reconsider the beating hypothesis in a nonlinear framework. It is shown that a resonance between a radial mode that is linearly unstable and a low-degree, low-order p-mode that is linearly stable can produce periodic amplitude variations of the radial mode such as observed on HR 7308. The resonance can also lead to situations for which the periodic oscillation of the amplitude of the radial mode is damped. A possible connection with the Blazhko effect in RR Lyrae stars is discussed.

Abstract Copyright: ∼

Journal keyword(s): stars: oscillations - cepheids - stars: individual: HR 7308 - stars: variable

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* V473 Lyr cC* 19 15 59.4893949000 +27 55 34.686262056 7.18 6.770 6.153     F8Ib-II 226 0

Query : 1995A&A...295..361V

Basic data :
V* V473 Lyr -- Classical Cepheid Variable
Other object types: otypes_help 		* (HD,AG,...), V* (NSV,V*,...), cC* (2022yCat), UV (TD1), NIR (2MASS), IR (IRAS)
ICRS coord. (ep=J2000) : 		19 15 59.4893949000 +27 55 34.686262056 (Optical) [ 0.0115 0.0167 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		19 13 59.1642843452 +27 50 12.558746492 [ 0.0115 0.0167 90 ]
Gal coord. (ep=J2000) : 		060.5643279905867 +07.4388938003973 [ 0.0115 0.0167 90 ]
Proper motions mas/yr : 		4.112 0.456 [0.014 0.019 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -15.8 [2] / z(~) -0.000053 [0.000007] / cz -15.80 [2.00]
   E 1953GCRV..C......0W
Parallaxes (mas): 		2.2876 [0.0206] A 2020yCat.1350....0G
Spectral type: 		F8Ib-II C 1981PASP...93...45B
Fluxes (7) :
U 7.18 [~] D 2003AJ....125.2531R
B 6.770 [0.014] D 2000A&A...355L..27H
V 6.153 [0.009] D 2000A&A...355L..27H
G 6.021648 [0.003959] C 2020yCat.1350....0G
J 5.470 [0.444] E 2003yCat.2246....0C
H 4.700 [0.036] C 2003yCat.2246....0C
K 4.549 [0.016] C 2003yCat.2246....0C
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Identifiers (33) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 180583 HIP 94685 SAO 87008 WEB 16511
AG+27 1918 HR 7308 SKY# 35756 YZ 27 9771
ALS 10228 IRAS 19139+2750 TD1 24296 AAVSO 1912+27
BD+27 3314 LS II +27 2 TIC 403786081 Gaia DR3 2036471357742521728
GC 26562 2MASS J19155949+2755346 TYC 2132-3196-1 Gaia DR1 2036471353425329664
GCRV 11719 NSV 11865 UBV 16313 Gaia DR2 2036471357742521728
GEN# +1.00180583 PPM 108686 UBV M 23628
GSC 02132-03196 Renson 50100 uvby98 100180583
HIC 94685 ROT 7581 V* V473 Lyr

References (226 between 1850 and 2026) (Total 226)
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 : 6    Distance : 3    Var : 1    Rot : 2    Fe/H : 8    Plx : 5    PM : 6    SpT : 11   

   

Observing logs
IUE : 5   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : V* V473 Lyr

Link by name to the catalogue in VizieR :

HD 180583 AG+27 1918 ALS 10228 BD+27 3314 GSC 02132-03196
HIC 94685 HIP 94685 HR 7308 IRAS 19139+2750 LS II +27 2
2MASS J19155949+2755346 NSV 11865 PPM 108686 SAO 87008 TD1 24296
TYC 2132-3196-1 uvby98 100180583 V* V473 Lyr Gaia DR3 2036471357742521728 Gaia DR1 2036471353425329664
Gaia DR2 2036471357742521728

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