منابع مشابه
0 Local Distance Indicators
A summary is given of the calibration of the Cepheid scale required in the derivation of distances from observations at V and I, as in the HST work on extragalactic Cepheids. There is some evidence that a small metallicity correction may be necessary in deriving distances in this way. The evidence for this comes both from observations of Cepheids of different metallicities and from a comparison...
متن کاملAGB Variables as Distance Indicators
Evidence for the existence of Mira Period-Luminosity relations is reviewed including recent work on Miras with thick circumstellar shells. The calibration of the relation at K is discussed in detail. The nature of variables deviating from the PL relation and possible metallicity effects are also discussed.
متن کاملCepheids as Distance Indicators: Some Current Problems
A general review is given of the calibration of the Cepheid distance scale, with particular reference to its use in the determination of H0. Emphasis is placed on the advantage of using a galactic calibration of the Cepheid scale, rather than relying on an adopted distance to the LMC. It is then possible to use LMC data to test for possible metallicity effects on this scale.
متن کاملThe Current Status of Primary Distance Indicators
A review is given of the current status of the primary distance indicators. The relevance of these indicators for determining the local expansion rate and the age of globular clusters is briefly outlined.
متن کاملType Ia Supernovae as Extragalactic Distance Indicators
Because Type Ia supernovae (SNe Ia) are not perfect standard candles, it is important to be able to use distance–independent observables (DIOs) to define subsets of SNe Ia that are " nearly standard candles " or to correct SN Ia absolute magnitudes to make them nearly homogeneous (" standardized candles "). This is not crucial for the measurement of H 0 , but it is for the measurement of q 0 an...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2005
ISSN: 0074-1809
DOI: 10.1017/s0074180900216240