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  • period-luminosity relations for cepheid variables: from mid-infrared to multi-phase

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 963
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
    this paper discusses two aspects of current research on the cepheid period-luminosity (p-l) relation: the derivation of mid-infrared (mir) p-l relations and the investigation of multi-phase p-l relations. the mir p-l relations for cepheids are important in the james webb space telescope era for the distance scale issue, as the relations have potential to derive the hubble constant within ∼ 2% accuracy—a critical constraint inprecision cosmology. consequently, we have derived the mir p-l relations for cepheids in the large and small magellanic clouds, using archival data from spitzer space telescope. we also compared currently empirical p-l relations for cepheids in the magellanic clouds to the synthetic mir p-l relations derived from pulsational models. for the study of multi-phase p-l relations, we present convincing evidence that the cepheid p-l relations in the magellanic clouds are highly dynamic quantities that vary significantly when considered as a function of pulsational phase. we found that there is a difference in p-l relations as a function of phase between the cepheids in each of the clouds; the most likely cause for this is the metallicity difference between the two galaxies. we also investigated the dispersion of the multi-phase p-l relations, and found that the minimum dispersions do not differ significantly from the mean light p-l dispersion.

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