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Synthetic Cepheid Period-Luminosity & Period-Color Relations in Spitzer's IRAC Bands
C. -C. Ngeow, M. Marconi, I. Musella +3
The mid-infrared period-luminosity (P-L) relation for Cepheids will be important in the JWST era, as it holds the promise of deriving the Hubble constant within 2% accuracy. We pre…
Statistical Tests for the Metallicity Dependency of the Synthetic Cepheid Period-Luminosity Relations in IRAC Bands
Chow-Choong Ngeow, Marcella Marconi, Ilaria Musella +2
The mid-infrared (MIR) period-luminosity (P-L) relations for Cepheids will be important in the JWST era, as it holds the promise of deriving the Hubble constant within 2% accuracy.…
Theoretical Cepheid Period-Luminosity And Period-Color Relations In Spitzer IRAC Bands
Chow-Choong Ngeow, Marcella Marconi, Ilaria Musella +2
In this paper the synthetic period-luminosity (P-L) relations in Spitzer's IRAC bands, based on a series of theoretical pulsation models with varying metal and helium abundance, we…
Spatial distribution and evolution of the stellar populations and candidate star clusters in the Blue Compact Dwarf I Zwicky 18
R. Contreras Ramos, F. Annibali, G. Fiorentino +7
The evolutionary properties and spatial distribution of I Zwicky 18 stellar populations are analyzed by means of HST/ACS deep and accurate photometry. The comparison of the resulti…
Distance to Galactic globulars using the near-infrared magnitudes of RR Lyrae stars: IV. The case of M5 (NGC5904)
G. Coppola, M. Dall'Ora, V. Ripepi +6
We present new and accurate near-infrared (NIR) J, K-band time series data for the Galactic globular cluster (GC) M5 = NGC5904. Data were collected with SOFI at the NTT (71 J + 120…