The HR Diagram and the Galactic Distance Scale After Hipparcos

▪ Abstract The completion and publication of the Hipparcos astrometric catalogue has revitalized studies in many fundamental areas of Galactic structure and stellar evolution. This article reviews the impact of the new parallax results on our understanding of the location of the main-sequence as a function of abundance, of the luminosity calibration of primary distance indicators and of the Galactic distance scale. Many of these issues remain to be resolved.

[1]  B. Carney,et al.  Relative abundance determinations in extremely metal poor giants. II. Transition probabilities and the abundance determinations , 1990 .

[2]  Robert F. Stellingwerf,et al.  Pulsation and stability of RR Lyrae stars. 1: Instability strip , 1994 .

[3]  A. Sandage.  The Oosterhoff Period-Metallicity Relation for RR Lyrae Stars at the Blue Fundamental Edge of the Instability Strip. I. , 1993 .

[4]  R. Hanson.  A practical method to improve luminosity calibrations from trigonometric parallaxes. , 1979 .

[5]  A. Chieffi,et al.  Isochrones for H-burning Globular Cluster Stars. II. The Metallicity Range -2.3 < [Fe/H] < -0.5 , 1991 .

[6]  N. Reid.  The M5 RR Lyrae population , 1996 .

[7]  C. Hogan,et al.  Conflict over the age of the Universe , 1995, Nature.

[8]  É. Biémont,et al.  The solar abundance of iron : a final word! , 1991 .

[9]  W. Huebner,et al.  Astrophysical opacity library. [Equation of state, mean opacities, extinction coefficients, electron density, mass density, plasma cut-off frequency] , 1977 .

[10]  A. Walker.  BVI CCD Photometry of Galactic Globular Clusters. II. M68 , 1994 .

[11]  B. Madore,et al.  An empirical test for the metallicity sensitivity of the Cepheid period-luminosity relation , 1990 .

[12]  B. Carney,et al.  BV PHOTOMETRY OF RR LYRAE VARIABLES IN THE GLOBULAR CLUSTER M92 , 1992 .

[13]  P. Stetson,et al.  Measuring age differences among globular clusters having similar metallicities - A new method and first results , 1990 .

[14]  M. Merrifield,et al.  Refining the Oort and Galactic constants , 1998, astro-ph/9802034.

[15]  C. Murray,et al.  The luminosity and kinematics of RR Lyrae stars in the solar neighbourhood – I. Statistical parallaxes of RR Lyraes , 1986 .

[16]  J. Lub.  Field RR Lyrae stars , 1987 .

[17]  A. R. Klemola,et al.  The Absolute Magnitude and Kinematics of RR Lyrae Stars via Statistical Parallax , 1996, astro-ph/9608108.

[18]  Mario G. Lattanzi,et al.  Ages of globular clusters from hipparcos parallaxes of local subdwarfs , 1997 .

[19]  R. Rich,et al.  The First Detailed Abundance Analysis of Galactic Bulge K Giants in Baade's Window , 1994 .

[20]  Chris Flynn,et al.  Metallicities and kinematics of G and K dwarfs , 1997 .

[21]  A. Sweigart.  Effects of Helium Mixing on the Evolution of Globular Cluster Stars , 1997 .

[22]  A. Sandage.  The Population Concept, Globular Clusters, Subdwarfs, Ages, and the Collapse of the Galaxy , 1986 .

[23]  V. Castellani,et al.  The evolution of He-burning stars - Horizontal and asymptotic branches in Galactic globulars , 1991 .

[24]  Don A. VandenBerg,et al.  Oxygen-enhanced Models for Globular Cluster Stars. II. Isochrones and Luminosity Functions , 1992 .

[25]  Allan Sandage,et al.  Main-sequence photometry, color-magnitude diagrams, and ages for the globular clusters M3, M13, M15, and M92 , 1970 .

[26]  F. V. Leeuwen,et al.  First results from HIPPARCOS trigonometrical parallaxes of Mira-type variables⋆ , 1997 .

[27]  T. Beers,et al.  The HK-II Survey: Kinematics of Metal-Poor Stars in the Galaxy , 1995 .

[28]  E. Solano.  The Absolute Magnitude of RR Lyraes: from Hipparcos Parallaxes and Proper Motions , 1998 .

[29]  R. Hilditch,et al.  Evolution of Horizontal-Branch Stars in Globular Clusters: The Interesting Case of V79 in M3 , 1997, astro-ph/9709024.

[30]  D. Latham,et al.  The Hyades Binaries θ1 Tauri and θ2 Tauri: The Distance to the Cluster and the Mass-Luminosity Relation , 1997 .

[31]  John E. Gizis.  M-subdwarfs: spectroscopic classification and the metallicity scale , 1997 .

[32]  J. Cohen.  Abundances in globular cluster red giants. V: The metal-rich globular clusters , 1983 .

[33]  The Cepheid period-luminosity zero-point from radial velocities and Hipparcos proper motions , 1998 .

[34]  Gerard Gilmore,et al.  Chemistry and Kinematics in the Solar Neighborhood: Implications for Stellar Populations and for Galaxy Evolution , 1995 .

[35]  L. Krauss,et al.  A Lower Limit on the Age of the Universe , 1995, Science.

[36]  M. Mayor,et al.  ROTATION OF THE OUTER DISC FROM CLASSICAL CEPHEIDS , 1997 .

[37]  A. Walker,et al.  CCD photometry of the RR Lyrae stars in NGC 121 and the distance to the Small Magellanic Cloud , 1988 .

[38]  P. Demarque,et al.  The evolution of horizontal-branch stars: Theoretical sequences , 1990 .

[39]  A. Walker,et al.  The Metallicity of RR Lyrae Stars in Baade's Window , 1991 .

[40]  David R. Soderblom,et al.  The Problem of Hipparcos Distances to Open Clusters. I. Constraints from Multicolor Main-Sequence Fitting* , 1998 .

[41]  T. S. van Albada,et al.  On the Two Oosterhoff Groups of Globular Clusters , 1973 .

[42]  Cepheids as Distance Indicators , 1999 .

[43]  M. Shetrone,et al.  Oxygen abundances in halo giants. IV. The oxygen-sodium anticorrelation in a sample of 22 bright giants in M13 , 1993 .

[44]  W. Baade,et al.  Über eine Möglichkeit, die Pulsationstheorie der δ Cephei‐Veränderlichen zu prüfen , 1926 .

[45]  J. B. Laird,et al.  A survey of proper motion stars. 12: an expanded sample , 1994 .

[46]  Cepheid Period-Radius and Period-Luminosity Relations and the Distance to the Large Magellanic Cloud , 1997, astro-ph/9710161.

[47]  P. Wood,et al.  Theoretical models of Cepheid variables and their BVI(c) colors and magnitudes , 1993 .

[48]  M. Seaton,et al.  Opacities for stellar envelopes , 1994 .

[49]  A. Walker.  The Absolute Magnitudes of LMC RR Lyrae Variables and the Ages of Galactic Globular Clusters , 1992 .

[50]  F. Rogers,et al.  Radiative atomic Rosseland mean opacity tables , 1992 .

[51]  Thomas G. Barnes,et al.  Stellar Angular Diameters and Visual Surface Brightness — I LATE SPECTRAL TYPES , 1976 .

[52]  White Dwarfs in Globular Clusters: Hubble Space Telescope Observations of M4* , 1997, astro-ph/9702169.

[53]  Sergio Ortolani,et al.  The White Dwarf Distance to the Globular Cluster NGC 6752 (and Its Age) with the HUBBLE SPACE TELESCOPE , 1996, astro-ph/9604179.

[54]  J. Cohen.  The Baade-Wesselink method applied to RR lyrae variables in the globular clusters M5 and M92 , 1992 .

[55]  P. Schechter,et al.  The Shape and Scale of Galactic Rotation from Cepheid Kinematics , 1997, astro-ph/9710055.

[56]  R. Zinn,et al.  The horizontal-branch stars in globular clusters. I - The period-shift effect, the luminosity of the horizontal branch, and the age-metallicity relation , 1990 .

[57]  R. Kirshner,et al.  Properties of the SN 1987A Circumstellar Ring and the Distance to the Large Magellanic Cloud , 1991 .

[58]  Michael A. Perryman,et al.  GAIA: Global astrometric interferometer for astrophysics. , 1996 .

[59]  J. Kovalevsky,et al.  FIRST RESULTS FROM HIPPARCOS , 1998 .

[60]  The Lutz-Kelker bias in trigonometric parallaxes , 1998 .

[61]  David G. Monet.  Recent Advances in Optical Astrometry , 1988 .

[62]  C. Heiles,et al.  Reddenings derived from H I and galaxy counts : accuracy and maps. , 1982 .

[63]  R. Stellingwerf,et al.  ON THE APPLICATION OF THE BAADE-WESSELINK METHOD TO RR LYRAE STARS , 1994 .

[64]  I. Neill Reid,et al.  White Dwarf Masses-Gravitational Redshifts Revisited , 1996 .

[65]  I. Skillen,et al.  The absolute magnitudes of RR Lyrae stars – I. X Arietis , 1989 .

[66]  J. Rose.  The vertical structure of our Galaxy. I, Methods of quantitative objective prism spectroscopy , 1991 .

[67]  T. S. van Albada,et al.  ON THE MASSES, LUMINOSITIES AND COMPOSITIONS OF HORIZONTAL-BRANCH STARS (These papers are represented by abstracts) , 1972 .

[68]  A. N. Cox.  Masses of RRd Variables Using Livermore OPAL Opacities , 1991 .

[69]  W. Gieren,et al.  Independent Distance Determinations to Milky Way Cepheids in Open Clusters and Associations. III. CV MON in Anon Van Den Bergh , 1996 .

[70]  M. Shetrone.  Al, Mg and Eu Abundances in Globular Cluster Giants. I. Tests of Deep Mixing , 1996 .

[71]  M. Mayor,et al.  Hipparcos subdwarfs and globular cluster ages: the distance and age of M92 ? , 1998 .

[72]  A. Weiss,et al.  An updated theoretical scenario for globular cluster stars , 1997, astro-ph/9707180.

[73]  J. Kovalevsky,et al.  The Hyades: distance, structure, dynamics, and age , 1997, astro-ph/9707253.

[74]  F. Rogers,et al.  Discrepancies between opal and OP opacities at high densities and temperatures , 1995 .

[75]  G. Gatewood,et al.  Correlation of the Hipparcos and Allegheny Observatory Parallax Catalogs , 1998 .

[76]  Wendy L. Freedman,et al.  THE CEPHEID DISTANCE SCALE , 1991 .

[77]  Metallicity Effects on the Cepheid Extragalactic Distance Scale from EROS photometry in LMC and SMC , 1996, astro-ph/9612216.

[78]  H. Arp,et al.  Color-magnitude diagrams for seven globular clusters. , 1955 .

[79]  P. Hauschildt,et al.  MODEL ATMOSPHERES OF VERY LOW MASS STARS AND BROWN DWARFS , 1997 .

[80]  G. Piotto,et al.  The Main Sequence and a White Dwarf Sequence in the Globular Cluster NGC 6397 , 1996 .

[81]  Wolfgang P. Gieren,et al.  Very Accurate Distances and Radii of Open Cluster Cepheids from a Near-Infrared Surface Brightness Technique , 1997, astro-ph/9707328.

[82]  Michael J. West,et al.  The globular cluster system of the Galaxy. III: measurements of radial velocity and metallicity for 60 clusters and a compilation of metallicities for 121 clusters , 1984 .

[83]  M. Catelán.  Is There a Difference in Luminosity between Field and Cluster RR Lyrae Variables? , 1998, astro-ph/9801064.

[84]  S. Arribas,et al.  Determination of effective temperatures for an extended sample of dwarfs and subdwarfs (F0-K5) , 1996 .

[85]  R. Santis,et al.  RR Lyrae variables in the field and the Sandage period-shift effect in globular clusters , 1992 .

[86]  F. V. Leeuwen,et al.  The Hipparcos Mission , 1997 .

[87]  N. Silbermann,et al.  The RR Lyrae variable stars in the globular cluster M15 , 1995 .

[88]  S. Ryan,et al.  Subdwarf studies. II - Abundances and kinematics from medium resolution spectra. III - The halo metallicity distribution , 1991 .

[89]  S. Hawley,et al.  Absolute Magnitudes and Kinematic Properties of RR Lyrae Stars , 1986 .

[90]  William E. Harris,et al.  A Catalog of Parameters for Globular Clusters in the Milky Way , 1996 .

[91]  N. Simon,et al.  A PROVISIONAL RR LYRAE DISTANCE SCALE , 1993 .

[92]  I. Reid,et al.  The Distance to NGC 6397 by M-Subdwarf Main-Sequence Fitting , 1998, astro-ph/9809024.

[93]  R. Gratton.  The absolute magnitude of field metal-poor horizontal branch stars , 1997, astro-ph/9710271.

[94]  W. Schuster,et al.  uvby-β photometry of high-velocity and metal-poor stars. II, Intrinsic color and metallicity calibrations , 1989 .

[95]  J. Beaulieu,et al.  Red Clump Morphology as Evidence against a New Intervening Stellar Population as the Primary Source of Microlensing toward the Large Magellanic Cloud , 1997, astro-ph/9710156.

[96]  C. D. Laney,et al.  Cepheid period-luminosity relations in K, H, J and V , 1994 .

[97]  B. Flannery,et al.  Approximate equation of state for stellar material , 1973 .

[98]  R. J. Bell,et al.  The colours of G and K type giant stars. I , 1979 .

[99]  C. Koen.  Confidence intervals for the Lutz–Kelker correction , 1992 .

[100]  D. Schlegel,et al.  Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds , 1998 .

[101]  Forrest J. Rogers,et al.  Opal equation-of-state tables for astrophysical applications , 1996 .

[102]  Andrew Gould,et al.  Systematics of RR Lyrae Statistical Parallax. III. Apparent Magnitudes and Extinctions , 1998, astro-ph/9805176.

[103]  A. Sweigart,et al.  Horizontal-Branch Evolution with Semiconvection II. Theoretical Sequences , 1976 .

[104]  B. Dorman.  Oxygen-enhanced models for globular cluster stars. III - Horizontal-branch sequences , 1992 .

[105]  A. Sandage.  The Oosterhoff Period Groups and the Age of Globular Clusters - Part Four - Field Rr-Lyrae Stars - Age of the Galactic Disk , 1982 .

[106]  A. Sandage,et al.  Confirmation of previous ground-based Cepheid P-L zero-points using Hipparcos trigonometric parallaxes , 1998 .

[107]  D. H. McNamara,et al.  THE ABSOLUTE MAGNITUDES OF THE RR LYRAE STARS , 1997 .

[108]  Berkeley,et al.  The Luminosity Function of the Globular Cluster NGC 6397 near the Limit of Hydrogen Burning , 1997, astro-ph/9711004.

[109]  R. G. Gratton,et al.  Abundances for globular cluster giants: I. homogeneous metallicities for 24 clusters , 1996, astro-ph/9607078.

[110]  Thomas E. Lutz,et al.  ON THE USE OF TRIGONOMETRIC PARALLAXES FOR THE CALIBRATION OF LUMINOSITY SYSTEMS: THEORY , 1973 .

[111]  P. Th. Oosterhoff,et al.  Some remarks on the variable stars in globular clusters , 1939 .

[112]  Hipparcos Parallaxes and the Cepheid Distance Scale , 1997, astro-ph/9707091.

[113]  G. Clementini,et al.  Homogeneous photometry and metal abundances for a large sample of Hipparcos metal-poor stars★ , 1998, astro-ph/9808298.

[114]  M. Bolte.  CCD Photometry in the Globular Cluster NGC 288. I. Blue Stragglers and Main-Sequence Binary Stars , 1992 .

[115]  Chris Flynn,et al.  Hipparcos and the age of the Galactic disc , 1998 .

[116]  James M. Moran,et al.  The distance to the center of the Galaxy , 1987 .

[117]  M. Pinsonneault,et al.  The Problem of Hipparcos Distances To Open Clusters. II. Constraints From Nearby Field Stars , 1998, astro-ph/9801281.

[118]  C. Sturch.  Intrinsic UBV colors of RR Lyrae stars , 1966 .

[119]  A. Sandage,et al.  On the Existence of Subdwarfs in the (MBol, log Te)-Diagram , 1959 .

[120]  R. F. Jameson,et al.  The absolute magnitudes of RR Lyrae stars – V. WY Antliae, W Crateris, RV Octantis and BB Puppis , 1993 .

[121]  Oscar Straniero,et al.  The alpha -enhanced Isochrones and Their Impact on the FITS to the Galactic Globular Cluster System , 1993 .

[123]  D. Schlegel,et al.  Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds , 1997, astro-ph/9710327.

[124]  A. Sandage,et al.  A Composite Period-Luminosity Relation for Cepheids at Mean and Maximum Light , 1968 .

[125]  M. Feast,et al.  The Cepheid period-luminosity zero-point from Hipparcos trigonometrical parallaxes† , 1997 .

[126]  A. Chieffi,et al.  Isochrones for Hydrogen-burning Globular Cluster Stars. III. From the Sun to the Globular Clusters , 1997 .

[127]  M. Feast,et al.  Galactic kinematics of Cepheids from Hipparcos proper motions , 1997, astro-ph/9706293.

[128]  E. Friel,et al.  A catalogue of [Fe/H] determinations: 1996 edition , 1992, astro-ph/9705206.

[129]  P. Flower,et al.  Transformations from Theoretical Hertzsprung-Russell Diagrams to Color-Magnitude Diagrams: Effective Temperatures, B-V Colors, and Bolometric Corrections , 1996 .

[130]  I. Neill Reid.  Younger and Brighter - New Distances to Globular Clusters Based on HIPPARCOS Parallax Measurements of Local Subdwarfs , 1997 .

[131]  M. Feast,et al.  A period–luminosity–colour relation for Mira variables , 1989 .

[132]  R. P. Kraft.  Color Excesses for Supergiants and Classical Cepheids. V. The Period-Color and Period-Luminosity Relations: a Revision. , 1961 .

[133]  J. King.  Abundance Ratios in a Common Proper Motion Pair: Chemical Evidence of Accreted Substructure in the Halo Field? , 1997 .

[134]  Robert L. Kurucz,et al.  Model Atmospheres for Population Synthesis , 1992 .

[135]  I. Reid,et al.  Hipparcos Subdwarf Parallaxes: Metal-rich Clusters and the Thick Disk , 1998 .

[136]  Carla Cacciari,et al.  On the absolute magnitude of RR Lyrae stars : UU Ceti, RV Phoenicis, and W Tucanae , 1992 .

[137]  The Age of Globular Clusters in Light of Hipparcos: Resolving the Age Problem? , 1997, astro-ph/9706128.

[138]  Forrest J. Rogers,et al.  Updated Opal Opacities , 1996 .

[139]  G. Benedetto,et al.  Improved Calibration of Cosmic Distance Scale by Cepheid Pulsation Parallaxes , 1997 .

[140]  C. Deliyannis,et al.  Keck HIRES Spectroscopy of M92 Subgiants: Surprising Abundances near the Turnoff , 1998 .

[141]  F. D’Antona,et al.  The Universe and Globular Clusters: An Age Conflict? , 1997 .

[142]  A. Sandage.  The Oosterhoff period groups and the age of globular clusters. II. Properties of RR Lyrae stars in six clusters: the P-L-A relation. , 1981 .

[143]  B.E.J. PagelL. Portinari.  Δ Y/Δ Z from fine structure in the main sequence based on Hipparcos parallaxes , 1997, astro-ph/9711332.

[144]  S. Bergh,et al.  Observations of RR Lyrae Stars in the Halo of M31 , 1987 .

[145]  R. Radick,et al.  Radial velocity of the Hyades cluster , 1984 .