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          Institute: MPI für Astrophysik     Collection: Stellar Astrophysics     Display Documents



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ID: 13513.0, MPI für Astrophysik / Stellar Astrophysics
On the reliability of the semi-empirical RR Lyrae period-V-band luminosity-blue amplitude relation
Authors:De Santis, R.; Cassisi, S.
Language:English
Date of Publication (YYYY-MM-DD):2002-10-11
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Volume:336
Issue / Number:1
Start Page:276
End Page:282
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We investigate the accuracy and reliability of the semi- empirical period-V-band luminosity-blue amplitude (PLA) relationship for ab-type RR Lyrae stars originally obtained by Castellani and De Santis in the mid-1990s. We infer that the zero-point of this relationship depends on the metallicity, by studying a sample of both field and cluster variables. We also show that the use of this relationship can still be useful for those stellar systems showing an intrinsic metallicity spread, since in this case the metallicity has a negligible effect on the final distance modulus estimate. We compare the adopted semi-empirical relationship with the fully empirical one recently provided by Kovacs & Walker. When the zero-point of the latter relation is fixed consistently with the former one, the two equations are equivalent. By applying the semi- empirical period-V-band luminosity-blue amplitude relation, as well as the technique proposed recently by Cassisi, De Santis & Piersimoni, to the globular cluster omega Cen, we show that the empirical slope of the relationship between the mass of the fundamental RR Lyrae pulsators and their metallicity is in fair agreement with the one predicted by updated evolutionary models for horizontal branch stars.
Free Keywords:stars : distances; stars : evolution; stars : horizontal branch; stars : variables : other; globular clusters : general; globular clusters : individual : omega Cen
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:INAF, Osservatorio Astron Teramo, Via M Maggini, I-64100; Teramo, Italy; INAF, Osservatorio Astron Teramo, I-64100 Teramo, Italy; Max Planck Inst Astrophys, D-85741 Garching, Germany
Identifiers:ISI:000178373600034
ISSN:0035-8711
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