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- W84207955 abstract "Abstract. Pulsatingconvectivemodelsandevolutionarytracksareusedtoconstrainmass,luminosity,andeffectivetemperatureof metal-poor (Z in the range of 0.0001 to 0.001) low-mass(0.52M –0.80M ) fundamental pulsators connected with thehorizontal branch and asymptotic branch phase.On this basis the fundamental period P(F) and the abso-lutebluemagnitudeB ofthepulsatorsarecalculated.Weshowthat, by scaling the blue magnitude of the pulsator to the valueB(3.83) of the zero age horizontal branch at the mean effectivetemperature of the RR Lyrae strip (logTe=3.83), the distri-bution of theoretical fundamental pulsators in the B(3.83)−Bvs P(F) plane is independent of metallicity. The limits of thisdistribution,whichdependontheadoptededgesoftheinstabil-itystrip,conformwellwithdataofknowntypeIICepheidsandshow that these variables are fundamental pulsators with massin the range of 0.59M to 0.52M .Moreover, since for fundamental pulsating models thereis a linear correlation of the blue magnitude with period andblue amplitude A(B), we are able to predict that the period-luminosity-blue amplitude relation for type II Cepheids withP ≤ 15daysisB(3.83)−B = −0.12+1.39logP +0.57A(B).The comparison with the theoretical evolutionary tracksyieldsthatthemassoftypeIICepheidsdecreaseswithincreas-ing the period and that the brightest variables with P ≥10 daysshould likely belong to the very rapid phases of the 0.52M and 0.53M evolution.Theagreementbetweenobservationsandcalculatedexpec-tations turns out to be almost satisfactory, suggesting that thepulsational and evolutionary scenario is capable to match theproperties of metal-poor pulsating stars.Keywords:stars:PopulationII–stars:evolution–stars:oscil-lations – II Cepheids" @default.
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- W84207955 date "1997-01-01" @default.
- W84207955 modified "2023-09-23" @default.
- W84207955 title "Evolutionary scenario for metal-poor pulsating stars I. Type II Cepheids" @default.
- W84207955 hasPublicationYear "1997" @default.
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