42 results on '"Vandenberg, Don A"'
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2. The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity
3. Constraints on the Distance Moduli, Helium and Metal Abundances, and Ages of Globular Clusters from their RR Lyrae and Non-variable Horizontal-branch Stars. III. M55 and NGC 6362
4. Constraints on the Distance Moduli, Helium, and Metal Abundances, and Ages of Globular Clusters from Their RR Lyrae and Non-variable Horizontal Branch Stars. II. Multiple Stellar Populations in 47 Tuc, M3, and M13
5. Evidence of a Significant Intermediate-Age Population in the M31 Halo from Main-Sequence Photometry
6. CONSTRAINTS ON THE DISTANCE MODULI, HELIUM AND METAL ABUNDANCES, AND AGES OF GLOBULAR CLUSTERS FROM THEIR RR LYRAE AND NON-VARIABLE HORIZONTAL-BRANCH STARS. I. M3, M15, AND M92
7. COLOR–MAGNITUDE DIAGRAM CONSTRAINTS ON THE METALLICITIES, AGES, AND STAR FORMATION HISTORY OF THE STELLAR POPULATIONS IN THE CARINA DWARF SPHEROIDAL GALAXY
8. THE QUENCHING OF THE ULTRA-FAINT DWARF GALAXIES IN THE REIONIZATION ERA
9. ISOCHRONES FOR OLD (>5 GYR) STARS AND STELLAR POPULATIONS. I. MODELS FOR –2.4 ⩽ [Fe/H] ⩽+0.6, 0.25 ⩽Y⩽ 0.33, AND –0.4 ⩽ [α/Fe] ⩽+0.4
10. THREE ANCIENT HALO SUBGIANTS: PRECISE PARALLAXES, COMPOSITIONS, AGES, AND IMPLICATIONS FOR GLOBULAR CLUSTERS, ,
11. THE AGES OF 55 GLOBULAR CLUSTERS AS DETERMINED USING AN IMPROVED $\Delta V^{\rm HB}_{\rm TO}$ METHOD ALONG WITH COLOR-MAGNITUDE DIAGRAM CONSTRAINTS, AND THEIR IMPLICATIONS FOR BROADER ISSUES
12. THE STELLAR INITIAL MASS FUNCTION OF ULTRA-FAINT DWARF GALAXIES: EVIDENCE FOR IMF VARIATIONS WITH GALACTIC ENVIRONMENT
13. HD 140283: A STAR IN THE SOLAR NEIGHBORHOOD THAT FORMED SHORTLY AFTER THE BIG BANG
14. FROM THE COLOR-MAGNITUDE DIAGRAM OF ω CENTAURI AND (SUPER-)ASYMPTOTIC GIANT BRANCH STELLAR MODELS TO A GALACTIC PLANE PASSAGE GAS PURGING CHEMICAL EVOLUTION SCENARIO
15. MODELS FOR METAL-POOR STARS WITH ENHANCED ABUNDANCES OF C, N, O, Ne, Na, Mg, Si, S, Ca, AND Ti, IN TURN, AT CONSTANT HELIUM AND IRON ABUNDANCES
16. THE PRIMEVAL POPULATIONS OF THE ULTRA-FAINT DWARF GALAXIES
17. THE WFC3 GALACTIC BULGE TREASURY PROGRAM: METALLICITY ESTIMATES FOR THE STELLAR POPULATION AND EXOPLANET HOSTS
18. On the Use of Blanketed Atmospheres as Boundary Conditions for Stellar Evolutionary Models
19. A Constraint on Z ⊙ from Fits of Isochrones to the Color-Magnitude Diagram of M67
20. Age Constraints for an M31 Globular Cluster from Main-Sequence Photometry
21. Models for Solar Abundance Stars with Gravitational Settling and Radiative Accelerations: Application to M67 and NGC 188
22. Thermal Stability of Rotating Low‐Mass Subgiants and Red Giants
23. Canonical Extra Mixing in Low‐Mass Red Giants
24. Evidence of a Significant Intermediate-Age Population in the M31 Halo from Main-Sequence Photometry
25. Models of Metal‐poor Stars with Gravitational Settling and Radiative Accelerations. II. The Age of the Oldest Stars
26. Models of Metal‐poor Stars with Gravitational Settling and Radiative Accelerations. I. Evolution and Abundance Anomalies
27. Models for Old, Metal‐poor Stars with Enhanced α‐Element Abundances. III. Isochrones and Isochrone Population Functions
28. Models for Old, Metal‐poor Stars with Enhanced α‐Element Abundances. I. Evolutionary Tracks and ZAHB Loci; Observational Constraints
29. Strömgren Photometry of Globular Clusters: The Distance and Age of M13, Evidence for Two Populations of Horizontal-Branch Stars
30. Age Gradient and the Second Parameter Problem in the Galactic Halo
31. [ITAL]Hubble Space Telescope[/ITAL] Observations of White Dwarfs in the Globular Cluster M4
32. Oxygen-enhanced models for globular cluster stars. I - Evolutionary tracks
33. The prediction of stellar effective temperatures from the mixing-length theory of convection
34. Models for Solar Abundance Stars with Gravitational Settling and Radiative Accelerations: Application to M67 and NGC 188
35. Models of Metal-poor Stars with Gravitational Settling and Radiative Accelerations. I. Evolution and Abundance Anomalies
36. Models for Old, Metal-poor Stars with Enhanced ?-Element Abundances. III. Isochrones and Isochrone Population Functions
37. Models for Old, Metal-poor Stars with Enhanced ?-Element Abundances. I. Evolutionary Tracks and ZAHB Loci; Observational Constraints
38. Carbon isotope ratios in field Population II giant stars
39. Thermal instabilities in low-mass subgiants?
40. Deep CCD photometry in globular clusters. VII - M30
41. On the horizontal branch and the helium content of 47 Tucanae
42. Mass functions for globular cluster main sequences based on CCD photometry and stellar models
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