scholarly journals Harmonizing the RR Lyrae and Clump Distance Scales-Stretching the Short Distance Scale to Intermediate Ranges?

2000 ◽  
Author(s):  
P Popowski
Keyword(s):  
Short Distance ◽  
Distance Scale ◽  
Rr Lyrae

scholarly journals Recent improvements to the Cepheid distance scale

1993 ◽  
Vol 139 ◽  
pp. 61-71
Author(s):  
Wendy L. Freedman ◽  
Barry F. Madore
Keyword(s):  
Near Infrared ◽  
Hubble Space Telescope ◽  
Systematic Difference ◽  
Distance Scale ◽  
Nearby Galaxy ◽  
Rr Lyrae ◽  
Cepheid Variables ◽  
Level Of Significance ◽  
Extragalactic Distance Scale ◽  
Better Than

AbstractIn the course of the last decade significant advances have been made in the observations of Cepheid variables and in their successful application to the extragalactic distance scale. Much of this progress has come about as a result of new CCD and near-infrared photometry. These recent improvements are discussed, and a comparison is given of Population I Cepheids and Population II distances. The correspondence is good, with the zero points agreeing at a level of better than 15% in distance. At this same level of significance, a systematic difference between these distances scales may exist, in the sense that the RR Lyrae distances appear to be smaller than the Cepheid distances (if it is assumed, as has generally been done for extragalactic studies of RR Lyraes, that Mv(RR) = 0.77 mag, independent of [Fe/H]). However, several recently-published calibrations of Mv(RR) significantly reduce this discrepancy. Finally, new Cepheid data for the nearby galaxy M81 are presented based on recent Hubble Space Telescope observations.

scholarly journals Pulsating Stars and the Distance Scale - II

1995 ◽  
Vol 155 ◽  
pp. 209-220
Author(s):  
Michael Feast
Keyword(s):  
Globular Clusters ◽  
Zero Point ◽  
Distance Scale ◽  
Age Difference ◽  
Distance Modulus ◽  
Pulsating Stars ◽  
Rr Lyrae ◽  
Galactic Globular Clusters

AbstractThe current Cepheid zero-point is equivalent to an LMC distance modulus of 18.57 ± 0.10. The zero-point from corrected Baade-Wesselink data is probably not significantly different from this. A reexamination of the Baade-Wesselink data for RR Lyrae variables leads to an LMC modulus of 18.51, an age difference between β- and α-group galactic globular clusters of +1.46±0.70 Gyr, and an Mv - [Fe/H] slope in agreement with theory. Other questions discussed include; Avoiding bias in using the Cepheid PL relation; Metallicity spread amongst Cepheids; Cepheids and Ho.

scholarly journals Nonlinear Convective Pulsation Models of Second Overtone SMC Cepheids

2002 ◽  
Vol 185 ◽  
pp. 420-423
Author(s):  
M. Marconi ◽  
G. Bono ◽  
F. Caputo
Keyword(s):  
Short Distance ◽  
Selection Criteria ◽  
Distance Scale ◽  
Model Predictions ◽  
Distance Indicators

AbstractNonlinear convective pulsation models representative of SMC Cepheids pulsating in the second overtone mode are presented. Model predictions are compared with observations and implications are derived for second overtone selection criteria. The role of overtone Cepheids as distance indicators is finally investigated and the derived distance scale is at odds with the so called short distance scale.

scholarly journals On the Impact of Helium Content on the RR Lyrae Distance Scale

2018 ◽  
Vol 864 (1) ◽  
pp. L13 ◽  
Author(s):  
M. Marconi ◽  
G. Bono ◽  
A. Pietrinferni ◽  
V. F. Braga ◽  
M. Castellani ◽  
...  
Keyword(s):  
Distance Scale ◽  
Helium Content ◽  
Rr Lyrae ◽  
The Impact

scholarly journals Calibration of the Cepheid Distance Scale

1993 ◽  
Vol 139 ◽  
pp. 72-80
Author(s):  
Wolfgang P. Gieren ◽  
Pascal Fouqué
Keyword(s):  
Large Magellanic Cloud ◽  
Distance Scale ◽  
Absolute Calibration ◽  
Rr Lyrae Stars ◽  
Sn 1987A ◽  
Rr Lyrae ◽  
Calibration Sets ◽  
Lyrae Stars ◽  
Zero Points ◽  
Good Agreement

AbstractThe absolute calibration of the Cepheid period-luminosity (PL) relation with galactic Cepheids is discussed. Various methods, most importantly the cluster ZAMS-fitting scale and the Baade-Wesselink scale are found to yield PL zero points which agree within ∼ ± 0.1 mag. The present Cepheid calibration sets the Large Magellanic Cloud at μ0 (LMC) = 18.6 ± 0.1 mag, in good agreement with the distance derived from SN 1987A and other methods except RR Lyrae stars which seem to give a shorter distance scale.

scholarly journals Adjusting the distance scales of old and intermediate-age tracers via statistical parallaxes

2012 ◽  
Vol 8 (S289) ◽  
pp. 44-47
Author(s):  
A. K. Dambis
Keyword(s):  
Absolute Magnitude ◽  
Distance Scale ◽  
Red Giants ◽  
Horizontal Branch ◽  
Rr Lyrae ◽  
Horizontal Branch Stars ◽  
Subgiant Stars ◽  
Zero Points ◽  
Photometric Distance ◽  
Selection Of

AbstractThe method of statistical-parallax determination is used to adjust the photometric distance-scale zero points and test the selection of several samples of old and intermediate-age tracer objects in the Milky Way, including RR Lyrae- and Mira-type variables, blue and red horizontal-branch stars, and red giants. We obtain reasonable and stable absolute-magnitude (and, hence, photometric distance-scale) corrections for all samples except for the red horizontal-branch stars, which appear to be significantly contaminated by main-sequence turn-off and subgiant stars.

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