The absolute magnitudes of LMC RR Lyrae variables and the ages of Galactic globular clusters

Walker, A. R.

doi:10.1086/186377

Cited by 170 publications

(207 citation statements)

References 0 publications

Supporting

Mentioning

179

Contrasting

Order By: Relevance

“…(8) is provided by the RR Lyrae stars studied by Walker (1992) The solutions are similar to those given previously (Eqs. 8 and 9).…”

Section: Comparison With Previous Worksupporting

confidence: 59%

“…Several other independent distance determinations coupled with the distance inferred from Cepheids give a mean value of 18.5±0.1 (Walker 1992). Note Eqs.…”

Section: Distances Of Lmc Smc and Other Local Group Galaxiesmentioning

confidence: 84%

“…(8), (17), (19), and (21) The M v -/[Fe/H] relation has proved to be very useful in the determination of a number of quantities of interest in stellar, galactic, and extragalactic astronomy. Recent discussion of the use of the relation may be found in papers by van den Bergh (1995);Walker (1992);and Layden et al (1996).…”

Section: Comparison With Previous Workmentioning

confidence: 99%

See 2 more Smart Citations

The Absolute Magnitudes of the RR Lyrae Stars

McNamara¹

1997

PASP

View full text Add to dashboard Cite

ABSTRACT. We present a new calibration of the relationship between the absolute magnitudes and metal abundances, [Fe/H], of RR Lyrae stars. Temperatures inferred from optical and near-infrared color indices and the new Kurucz models are utilized in conjunction with Baade-Wesselink solutions to derive absolute magnitudes. Temperatures inferred from the optical and near-infrared photometry are -200-300 K higher for the variables than those given from (V-K) color indices and the older Kurucz models. We find M v = 0.287[Fe/H]+ 0.964. This equation gives higher luminosities ( -0.2 mag) for the metal-poor variables than previous B-W calibrations. The RR Lyrae stars in the Large Magellanic Cloud in conjunction with our calibration yield a distance modulus of 18.53. Thus, the Cepheids and RR Lyrae stars give identical distance moduli at ^0.1 mag level. The repercussions of the higher temperatures and higher luminosities of RR Lyrae stars on the distances and ages of globular clusters, distance to the galactic center, the Hubble constant and age of the Universe, and the masses of RR Lyrae stars are discussed.

show abstract

“…(8) is provided by the RR Lyrae stars studied by Walker (1992) The solutions are similar to those given previously (Eqs. 8 and 9).…”

Section: Comparison With Previous Worksupporting

confidence: 59%

“…Several other independent distance determinations coupled with the distance inferred from Cepheids give a mean value of 18.5±0.1 (Walker 1992). Note Eqs.…”

Section: Distances Of Lmc Smc and Other Local Group Galaxiesmentioning

confidence: 84%

See 1 more Smart Citation

The Absolute Magnitudes of the RR Lyrae Stars

McNamara¹

1997

PASP

View full text Add to dashboard Cite

show abstract

“…These distance measures include the use of Cepheid variable period-luminosity relations [17,18], or SN 1987A light echoes [19,20].…”

Section: Lmc Distance Measuresmentioning

confidence: 99%

“…This was long before I knew much at all about the detailed issues associated with fitting the main sequence turn-off magnitudes. At the time I was at Yale University, and my colleague in the Astronomy Department there, Pierre Demarque, was using the new Yale isochrones and finding good agreement with ages for the oldest globular clusters in the range [16][17][18][19][20] Gyr. Pierre suggested that this number was accurate to perhaps 20 %, although he felt that this could just as likely result in longer ages rather than shorter ones.…”

mentioning

confidence: 98%

The age of globular clusters

Krauss

2000

Physics Reports

View full text Add to dashboard Cite

I review here recent developments which have affected our understanding of both the absolute age of globular clusters and the uncertainties in this age estimate, and comment on the implications for cosmological models. This present estimate is in agreement with the range long advocated by David Schramm. The major uncertainty in determining ages of globular clusers based upon the absolute magnitude of the main sequence turn-off remains the uncertainty in the distance to these clusters. Estimates of these distances have recently been upwardly revised due to Hipparcos parallax measurements, if one calibrates luminosities of main sequence stars. However, it is important to realize that at the present time, different distance measures are in disagreement. A recent estimate is that the oldest clusters are 11.5 ± 1.3 Gyr, implying a one-sided 95% confidence level lower limit of 9.5 Gyr, if statistical parallax distance measures are not incorporated. Incorporating more recent measures, including Hipparcos based statistical parallax measures, raises the mean predicted age to 12.8 ± 1 Gyr, with a 95 % confidence range of 10-17 Gyr. I conclude by discussing possible improvements which may allow a more precise age distribution in the near future.

show abstract

6.2.1 Galactic globular clusters

Seggewiss¹,

Richtler²

Stars and Star Clusters

View full text Add to dashboard Cite

The absolute magnitudes of LMC RR Lyrae variables and the ages of Galactic globular clusters

Cited by 170 publications

References 0 publications

The Absolute Magnitudes of the RR Lyrae Stars

The Absolute Magnitudes of the RR Lyrae Stars

The age of globular clusters

6.2.1 Galactic globular clusters

Contact Info

Product

Resources

About