The vertical height of the horizontal branch - The range in the absolute magnitudes of RR Lyrae stars in a given globular cluster

1990 ◽  
Vol 350 ◽  
pp. 603 ◽  
Author(s):  
Allan Sandage
Keyword(s):  
Globular Cluster ◽  
Horizontal Branch ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
The Absolute ◽  
Absolute Magnitudes ◽  
Lyrae Stars ◽  
Vertical Height

scholarly journals Turnoffs and Ages of Globular Clusters

1988 ◽  
Vol 126 ◽  
pp. 635-636
Author(s):  
F. Buonanno ◽  
C. E. Corsi ◽  
F. Fusi Pecci
Keyword(s):  
Globular Clusters ◽  
Horizontal Branch ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
The Absolute ◽  
The Difference ◽  
Absolute Magnitudes ◽  
Lyrae Stars ◽  
The Way

The way to arrive at (even relative) ages for globular clusters involves the determination of their (relative) distances. We would like to see a theory which would fit the absolute magnitudes of RR Lyrae stars as determined from observations (Sandage effect). We have examined a sample of 17 CM diagrams of galactic globular clusters, 11 of which were observed at ESO and reduced with the program, ROMAFOT and 6 of which were taken from the literature. In Fig. 1 the difference in bolometric magnitude between the turnoff point and the location of the zero-age horizontal branch (ZAHB), δV RRTO (bo1) is plotted versus [Fe/H]. It turns out that δV RRTO ≃ δ RRTO (bo1) + 0.1 = 3.56 ±0.15. We are faced with the problem of determining how the horizontal branch scales with metallicity in order to understand the constant value of 3.56 in this relation.

On the absolute magnitudes of RR Lyrae stars

1986 ◽  
Vol 307 ◽  
pp. L9 ◽  
Author(s):  
T. G., III Barnes ◽  
S. L. Hawley
Keyword(s):  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
The Absolute ◽  
Absolute Magnitudes ◽  
Lyrae Stars

scholarly journals The absolute magnitudes of RR Lyrae stars – III. DH Peg ⋆

1990 ◽  
Vol 242 (4) ◽  
pp. 685-691 ◽  
Author(s):  
J. A. Fernley ◽  
I. Skillen ◽  
R. F. Jameson ◽  
A. J. Longmore
Keyword(s):  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
The Absolute ◽  
Absolute Magnitudes ◽  
Lyrae Stars

scholarly journals The absolute magnitudes of RR Lyrae stars – II. DX Delphini⋆

1989 ◽  
Vol 241 (2) ◽  
pp. 281-294 ◽  
Author(s):  
I. Skillen ◽  
J. A. Fernley ◽  
R. F. Jameson ◽  
A. E. Lynas-Gray ◽  
A. J. Longmore
Keyword(s):  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
The Absolute ◽  
Absolute Magnitudes ◽  
Lyrae Stars

scholarly journals Period Changes of RR Lyrae Stars in the LMC Globular Cluster NGC 2257

1984 ◽  
Vol 108 ◽  
pp. 39-40 ◽  
Author(s):  
James M. Nemec ◽  
Martha H. Liller ◽  
James E. Hesser
Keyword(s):  
Physical Properties ◽  
Globular Cluster ◽  
Period Change ◽  
Stellar Systems ◽  
Horizontal Branch ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Horizontal Branch Stars ◽  
Lyrae Stars

The period changes of RR Lyrae stars can be compared with models of horizontal branch stars as a means of investigating the physical properties of the stars themselves, and of the stellar systems in which they are found (Smith and Sandage 1981). The present study is the first in which period change rates of extragalactic RR Lyraes have been estimated.

scholarly journals Absolute Magnitudes and Colors of RR Lyrae Stars in DECam Passbands from Photometry of the Globular Cluster M5

2017 ◽  
Vol 154 (3) ◽  
pp. 85 ◽  
Author(s):  
A. Katherina Vivas ◽  
Abhijit Saha ◽  
Knut Olsen ◽  
Robert Blum ◽  
Edward W. Olszewski ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Rr Lyrae Stars ◽  
Rr Lyrae ◽  
Absolute Magnitudes ◽  
Lyrae Stars
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