Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30135
Title: | On the impact of Helium abundance on the Cepheid Period-Luminosity and Wesenheit relations and the Distance Ladder | Authors: | CARINI, Roberta BROCATO, Enzo RAIMONDO, Gabriella MARCONI, Marcella |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 469 | Issue: | 2 | First Page: | 1532 | Abstract: | This work analyses the effect of the Helium content on synthetic Period-Luminosity Relations (PLRs) and Period-Wesenheit Relations (PWRs) of Cepheids and the systematic uncertainties on the derived distances that a hidden population of He-enhanced Cepheids may generate. We use new stellar and pulsation models to build a homogeneous and consistent framework to derive the Cepheid features. The Cepheid populations expected in synthetic color-magnitude diagrams of young stellar systems (from 20 Myr to 250 Myr) are computed in several photometric bands for Y = 0.25 and Y = 0.35, at a fixed metallicity (Z = 0.008). The PLRs appear to be very similar in the two cases, with negligible effects (few %) on distances, while PWRs differ somewhat, with systematic uncertainties in deriving distances as high as about 7% at log P < 1.5. Statistical effects due to the number of variables used to determine the relations contribute to a distance systematic error of the order of few percent, with values decreasing from optical to near-infrared bands. The empirical PWRs derived from multi-wavelength datasets for the Large Magellanic Cloud (LMC) is in a very good agreement with our theoretical PWRs obtained with a standard He content, supporting the evidence that LMC Cepheids do not show any He effect. | URI: | http://hdl.handle.net/20.500.12386/30135 | URL: | http://arxiv.org/abs/1704.08875v1 https://academic.oup.com/mnras/article/469/2/1532/3747492 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx927 | Bibcode ADS: | 2017MNRAS.469.1532C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
stx927.pdf | Pdf editoriale | 1.92 MB | Adobe PDF | View/Open |
Page view(s)
61
checked on Mar 28, 2024
Download(s)
19
checked on Mar 28, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.