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http://hdl.handle.net/20.500.12386/23818
Titolo: | Theoretical modeling of the RR Lyrae variables in NGC 1851 | Autori: | Kunder, A. Salaris, M. CASSISI, Santi de Propris, R. Walker, A. Stetson, P. B. Catelan, M. Amigo, P. |
Data pubblicazione: | 2015 | Rivista: | MEMORIE DELLA SOCIETA ASTRONOMICA ITALIANA | Numero: | 86 | Da pagina:: | 199 | Abstract: | The RR Lyrae instability strip (IS) in NGC 1851 is investigated, and a model is presented which reproduces the pulsational properties of the RR Lyrae population. In our model, a stellar component within the IS that displays minor helium variations (Ỹ0.248-0.270) is able to reproduce the observed periods and amplitudes of the RR Lyrae variables, as well as the frequency of fundamental and first-overtone RR Lyrae variables. The RR Lyrae variables therefore may belong to an He-enriched second generation of stars. The RR Lyrae variables with a slightly enhanced helium (Ỹ0.270-0.280) have longer periods at a given amplitude, as is seen with Oosterhoff II (OoII) RR Lyrae variables, whereas the RR Lyrae variables with Ỹ0.248-0.270 have shorter periods, exhibiting properties of Oosterhoff I (OoI) variables. | URI: | http://hdl.handle.net/20.500.12386/23818 | URL: | http://sait.oat.ts.astro.it/MSAIt860215/index.html | ISSN: | 0037-8720 | Bibcode ADS: | 2015MmSAI..86..199K | Fulltext: | open |
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