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CEPHEID PERIOD-LUMINOSITY RELATIONS IN THE NEAR-INFRARED AND THE DISTANCE TO M31 FROM THE HUBBLE SPACE TELESCOPE WIDE FIELD CAMERA 3.
- Source :
-
Astrophysical Journal . Feb2012, Vol. 745 Issue 1, Special section p1-6. 6p. - Publication Year :
- 2012
-
Abstract
- We present measurements of 68 classical Cepheids, most detected from the Canada-France-Hawaii Telescope POMME Survey, with periods from 10 to 78 days observed in the near-infrared by the Panchromatic Hubble Andromeda Treasury Program using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST). The combination of HSTs resolution and the use of near-infrared measurements provide a dramatic reduction in the dispersion of the period-luminosity relation over the present optical, ground-based data. Even using random phase magnitudes we measure a dispersion of just 0.17 mag, implying a dispersion of just 0.12 mag for mean magnitudes. The error in the mean for this relation is 1% in distance. Combined with similar observations of Cepheids in other hosts and independent distance determinations, we measure a distance to M31 of µ0 = 24.38 ± 0.06(statistical) ± 0.03(systematic), 752 ± 27 kpc, in good agreement with past measurements though with a better. 3% precision here. The result is also in good agreement with independent distance determinations from two detached eclipsing binaries allowing for an independent calibration of the Cepheid luminosities and a determination of the Hubble constant. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CEPHEIDS
*STAR observations
*REDSHIFT
*METAPHYSICAL cosmology
Subjects
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 745
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 73784542
- Full Text :
- https://doi.org/10.1088/0004-637X/745/2/156