Gaia, Variable Stars and the Distance Scale

2014 ◽  
Vol 67-68 ◽  
pp. 263-269 ◽  
Author(s):  
P.A. Whitelock ◽  
M.W. Feast
Keyword(s):  
Variable Stars ◽  
Distance Scale

scholarly journals Radial velocities, metallicities, and distances of Cepheids in M31 and M33

2004 ◽  
Vol 193 ◽  
pp. 99-102
Author(s):  
Amy D. Forestell ◽  
Thomas G. Barnes ◽  
Christopher Sneden ◽  
Thomas J. Moffett
Keyword(s):  
High Resolution ◽  
Surface Brightness ◽  
Local Group ◽  
Variable Stars ◽  
Radial Velocities ◽  
Distance Scale ◽  
Distance Measurements ◽  
Using Data ◽  
Extragalactic Distance Scale

AbstractCepheid variable stars are fundamental to the calibration of the extragalactic distance scale. We present radial velocities, preliminary metallicities, and preliminary surface brightness distances of Cepheids in Local Group galaxies M31 and M33 using data obtained with the High Resolution Spectrograph on the Hobby-Eberly Telescope at McDonald Observatory. These data are the first step toward surface brightness distance measurements and metallicity calibrations of these extragalactic Cepheids.

RR Lyrae Variable Stars and the Distance Scale

1978 ◽  
pp. 53-57 ◽  
Author(s):  
S. V. M. Clube ◽  
J. A. Dawe
Keyword(s):  
Variable Stars ◽  
Distance Scale ◽  
Rr Lyrae

scholarly journals Variable Stars in Clusters and the Distance Scale - Some Recent Results Concerning the LMC Cluster NGC 1866

2002 ◽  
Vol 207 ◽  
pp. 539-544
Author(s):  
Alistair R. Walker ◽  
Gabriella Raimondo ◽  
Elisa di Carlo
Keyword(s):  
Large Magellanic Cloud ◽  
Variable Stars ◽  
Magellanic Cloud ◽  
Distance Scale ◽  
Cloud Cluster

After summarizing the importance of clusters and variable stars in the context of the distance scale, we focus on two new, and independent, programs to determine the distance to the Large Magellanic Cloud cluster NGC 1866.

scholarly journals Stellar distances by the Baade-Wesselink method

1997 ◽  
Vol 189 ◽  
pp. 25-28
Author(s):  
G. P. Di Benedetto
Keyword(s):  
Variable Stars ◽  
Distance Scale ◽  
Scale Calibration ◽  
Cosmic Distance Scale

Galactic and extragalactic distances to Cepheid variable stars according to a modern realization of the geometric Baade-Wesselink method are presented. Reliable results as accurate as few percent are currently achievable, allowing the cosmic distance scale calibration to be significantly improved with respect to previous calibrations.

scholarly journals The Tip of the Red Giant Branch as a Population II Distance Indicator

1999 ◽  
Vol 183 ◽  
pp. 48-53 ◽  
Author(s):  
Shoko Sakai
Keyword(s):  
Type Systems ◽  
Variable Stars ◽  
Distance Scale ◽  
Late Type ◽  
Major Disadvantage ◽  
Nearby Galaxies ◽  
Distance Indicator ◽  
Red Giant ◽  
Extragalactic Distance Scale ◽  
Distance Indicators

The period–luminosity (PL) relation of the Cepheid variable stars is the most reliable primary distance indicator for nearby galaxies, and serves as the foundation of the extragalactic distance scale, providing the firm calibration for various secondary distance indicators. However, a major disadvantage of the Cepheid distance scale is that it can only be applied to late–type systems with recent or current star formation. An alternative distance indicator is a Pop II, tip of the red giant branch (TRGB) method, which is extremely attractive because of its applicability to all morphological types of galaxies. As long as a metal–poor RGB stars are present in abundant numbers, the distance can be estimated with an accuracy that is as good as that of the Cepheid PL relation.

scholarly journals Variable Stars and the Cosmic Distance Scale

1989 ◽  
Vol 111 ◽  
pp. 169-176
Author(s):  
Jeremy Mould
Keyword(s):  
Hubble Space Telescope ◽  
Hubble Constant ◽  
Variable Stars ◽  
Virgo Cluster ◽  
Distance Scale ◽  
Stellar Structure ◽  
Space Telescope ◽  
Pulsating Variable Stars ◽  
Extragalactic Distance Scale ◽  
Detector Technology

For three quarters of a century pulsating variable stars have lain at the foundation of the extragalactic distance scale. The construction of larger telescopes, advances in detector technology, hard work by observers, and our understanding of stellar structure have all contributed to the expansion of the realm of the Cepheids to the distance of M101. Now, with the advent of Hubble Space Telescope (HST), we can look forward to the detection of Cepheids in the Virgo cluster and the removal of much of the remaining uncertainty in the Hubble constant.

scholarly journals Cepheid and Long – Period Variables in Virgo Cluster Galaxies

1993 ◽  
Vol 139 ◽  
pp. 81-89
Author(s):  
M.J. Pierce ◽  
R.D. McClure ◽  
D.L. Welch ◽  
R. Racine ◽  
S. van den Bergh
Keyword(s):  
High Resolution ◽  
Hubble Constant ◽  
Variable Stars ◽  
Virgo Cluster ◽  
Distance Scale ◽  
Cluster Galaxies ◽  
Cluster Distance ◽  
Resolution Imaging ◽  
Extragalactic Distance Scale

AbstractWe are currently undertaking a ground-based imaging survey which attempts to discover and determine periods for variable stars in Virgo Cluster galaxies. Such a survey is now feasible thanks to the high resolution imaging (FWHM ≤ 0.50 arcsec) routinely obtained with the High Resolution Camera on the Canada-France-Hawaii Telescope. The Virgo Cluster has long been considered a crucial “stepping-stone” in the extragalactic distance scale problem given that the cluster is at a “cosmologically interesting” distance and that there is little controversy in the relative distance between Virgo and more distant clusters, such as Coma. Consequently, much of the controversy regarding the extragalactic distance scale and the Hubble Constant can be eliminated with a determination of the Virgo Cluster distance. Some preliminary results and the prospects for establishing the distance to the Virgo Cluster using Cepheids and LPVs are discussed.

scholarly journals The galactic distance scale

1979 ◽  
Vol 84 ◽  
pp. 195-200 ◽  
Author(s):  
J. A. Graham
Keyword(s):  
Recent Work ◽  
Galactic Center ◽  
Variable Stars ◽  
Distance Scale ◽  
Rr Lyrae ◽  
A Value ◽  
The Galaxy ◽  
Distance Indicators

Recent work on the distance scale of the Galaxy has largely been in the direction of refining previously established methods. The RR Lyrae variable stars appear to be better distance indicators than was once thought and they have been used in determining Ro, the distance to the Galactic center. Ro is probably somewhat less than 10 kpc but greater than 7 kpc. Most methods point to a value near 8.5 kpc.

scholarly journals TOWARD A BETTER UNDERSTANDING OF THE DISTANCE SCALE FROM RR LYRAE VARIABLE STARS: A CASE STUDY FOR THE INNER HALO GLOBULAR CLUSTER NGC 6723

2013 ◽  
Vol 210 (1) ◽  
pp. 6 ◽  
Author(s):  
Jae-Woo Lee ◽  
Mercedes López-Morales ◽  
Kyeongsoo Hong ◽  
Young-Woon Kang ◽  
Brian L. Pohl ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Variable Stars ◽  
Distance Scale ◽  
Rr Lyrae
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