2000MNRAS.316..819C

Query : 2000MNRAS.316..819C

2000MNRAS.316..819C - Mon. Not. R. Astron. Soc., 316, 819-826 (2000/August-3)

Pulsational MV versus [Fe/H] relation(s) for globular cluster RR Lyrae variables.

CAPUTO F., CASTELLANI V., MARCONI M. and RIPEPI V.

Abstract (from CDS):

We use the results from recent computations of updated non-linear convective pulsating models to constrain the distance modulus of Galactic globular clusters through the observed periods of first-overtone (RRc) pulsators. The resulting relation between the mean absolute magnitude of RR Lyrae stars <]MV(RR)> and the heavy element content [Fe/H] appears well in the range of several previous empirical calibrations, but with a non-linear dependence on [Fe/H] so that the slope of the relation increases when moving towards larger metallicities. On this ground, our results suggest that metal-poor ([Fe/H]←1.5) and metal-rich ([Fe/H]>-1.5) variables follow two different linear <]MV(RR)>-[Fe/H] relations. Application to RR Lyrae stars in the metal-poor globular clusters of the Large Magellanic Cloud (LMC) provides an LMC distance modulus of the order of 18.6mag, thus supporting the `long' distance scale. The comparison with recent predictions based on updated stellar evolution theory is briefly presented and discussed.

Abstract Copyright: 2000, Royal Astronomical Society

Journal keyword(s): stars: horizontal branch - stars: variables: other - globular clusters: general - distance scale

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
5 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
6 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
7 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
8 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
9 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
10 IC 4499 GlC 15 00 18.57 -82 12 49.6     8.56     ~ 375 0
11 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
12 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
13 M 9 GlC 17 19 11.78 -18 30 58.5   9.36 8.42     ~ 348 0
14 NGC 6362 GlC 17 31 54.99 -67 02 54.0           ~ 637 0
15 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
16 NGC 7006 GlC 21 01 29.465 +16 11 16.49     10.46     ~ 562 0
17 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
18 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1

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