2009
• Metallicity gradients in the Milky Way, W. J. Maciel, R. D. D. Costa, IAU Symp. 265, Chemical abundances in the Universe: Connecting the first Stars to Planets, ed. K. Cunha, M. Spite, B. Barbuy, (in press)
  abstract (HTML) article(PDF)

• Planetary nebulae and the chemical evolution of the Magellanic Clouds, W. J. Maciel, R. D. D. Costa, T, E, P. Idiart Rev. Mexicana Astron. Astrof. 45, 127 (2009)
  abstract (HTML) article(PDF)

• Ages of central stars of planetary nebulae, W. J. Maciel, R. D. D. Costa, T. E. P. Idiart, IAU Symp. 258, The ages of stars, ed. E.E. Mamajek, D.R. Soderblom, R.F.G. Wyse, CUP, electronic publication, http://abstracts.stsci.edu/IAU258/Maciel.pdf (2009)
  abstract (HTML) article(PDF)

• Chemical evolution of the Magellanic Clouds based on planetary nebulae, W. J. Maciel, R. D. D. Costa, T. E. P. Idiart, IAU Symp. 256, The Magellanic System: Stars, Gas, and Galaxies, ed. J. Th. van Loon, J. M. Oliveira, CUP, electronic publication (2009)
  abstract (HTML) article(PDF)

• Abundance gradients in the galactic disk: space and time variations, W. J. Maciel, R. D. D. Costa, IAU Symp. 254, The galactic disk in cosmological context, ed. J. Andersen, J. Bland-Hawthorn, B. Nordström, CUP, electronic publication (2009)
  abstract (HTML) article(PDF)

• Chemical abundances of planetary nebulae in the disk-bulge connection, R. D. D. Costa, O. Cavichia, W. J. Maciel, IAU Symp. 254, The galactic disk in cosmological context, ed. J. Andersen, J. Bland-Hawthorn, B. Nordström, CUP, electronic publication (2009)
  abstract (HTML) article(PDF)

  2008

• Metallicity effects on the modified wind momentum of CSPN, W. J. Maciel, G. R. Keller, R. D. D. Costa, Rev. Mexicana Astron. Astrof. 44, 221 (2008)
  abstract (HTML) article(PDF)

• Chemical evolution of the galactic bulge: single and double infall models, R. D. D. Costa, W. J. Maciel, A. V. Escudero, Baltic Astron. 17, 321 (2008)
  abstract (HTML) article(PDF)

• Stellar winds from central stars of planetary nebulae: metallicity effects, W. J. Maciel, R. D. D. Costa, Mass loss from stars and the evolution of stellar clusters, ed. A. de Koter, L. Smith, L. B. F. M. Waters, ASP vol. 388, 197 (2008)
  abstract (HTML) article(PDF)

  2007

• The Abundance Gradient in Galactic H II Regions, R. T., Rood, C. Quireza, T. M. Bania, D. S. Balser, W. J. Maciel, From Stars to Galaxies: Building the Pieces to Build Up the Universe, ASP Conference Series, Vol. 374, Ed. A. Vallenari, R. Tantalo, L. Portinari, A. Moretti, 169 (2007)
  abstract (HTML) article(PDF)

• Bayesian posterior classification of planetary nebulae according to the Peimbert types, C. Quireza, H. J. Rocha-Pinto, W. J. Maciel, Astron. Astrophys. 475, 217 (2007)
  abstract (HTML) article(PDF)

• A survey of early-type stars based on the 2MASS database, R. P. Ortiz, M. Malacarne, R. Wilhelm, R. D. D. Costa, S. Rossi, W. J. Maciel, A. F. M. Costa, Astron. J. 134, 1183 (2007)
  abstract (HTML) article(PDF)

• Chemical evolution of the Small Magellanic Cloud based on planetary nebulae, T. P. Idiart, W. J. Maciel, R. D. D. Costa, Astron. Astrophysics 472, 101 (2007)
  abstract (HTML) article(PDF)

• Time variation of radial gradients in the galactic disk: electron temperatures and abundances, W. J. Maciel, C. Quireza, R. D. D. Costa, Astron. Astrophysics Letters 463, L13 (2007)
  abstract (HTML) article(PDF)

• Evolution of planetary nebulae in the mid-infrared, R. Ortiz, M. V. F. Copetti, W. J. Maciel, S. Lorenz-Martins, Why galaxies care about AGB stars, ASP Conference Series, Vol. 378, Ed. F. Kerschbaum, C. Charbonnel, R. F. Wing, 329 (2007)
  abstract (HTML) article(PDF)

• A catalogue of distances of planetary nebulae, W. J. Maciel, Astron. Astrophysics Suppl. Ser., 55, 253 (1984)
  catalogue (PDF) catalogue (ASCII) original article(PDF)

  2006

• The Electron Temperature Gradient in the Galactic Disk, C. Quireza, R. T. Rood, T. M. Bania, D. S. Balser, W. J. Maciel, Astrophysical Journal 653, 1226 (2006)
  abstract (HTML) article(PDF)

• Dynamical evidence of the age-metallicity relation in the Milky Way disk, H. J. Rocha-Pinto, R. H. O. Rangel, G. F. Porto de Mello, G. A. Bragança, W. J. Maciel, Astronomy and Astrophysics 453, L9 (2006)
  abstract (HTML) article(PDF)

• An estimate of the time variation of the abundance gradient from planetary nebulae III. O, S, Ar, and Ne: A comparison of PN samples, W. J. Maciel, L. G. Lago, R. D. D. Costa, Astronomy and Astrophysics 453, 587 (2006)
  abstract (HTML) article(PDF)

• New results on the time variation of the radial abundance gradients from planetary nebulae, W. J. Maciel, L. G. Lago, R. D. D. Costa, Planetary Nebulae in our Galaxy and beyond, IAU Symposium 234, ed. M. J. Barlow, R. H. Mendez, ASP, 453 (2006)
  abstract (HTML) article(PDF)

• Planetary nebulae as probes for galactic chemical evolution, R. D. D. Costa, W. J. Maciel, Planetary Nebulae in our Galaxy and beyond, IAU Symposium 234, ed. M. J. Barlow, R. H. Mendez, ASP, 243 (2006)
  abstract (HTML) article(PDF)

• Abundance Variations in the Galactic Disk: Planetary Nebulae, Open Clusters and Field Stars, W. J. Maciel, R. D. D. Costa, Chemical abundances and mixing in stars in the Milky Way and its satellites, ESO/Arcetri Conference, ed. S. Randich, L. Pasquini, Springer, p. 62 (2006)
  abstract (HTML) article(PDF)

• Chemical composition of planetary nebulae: the Galaxy and the Magellanic Clouds, W. J. Maciel, R. D. D. Costa, T. E. P. Idiart, Planetary Nebulae beyond the Milky Way, ESO Workshop, ed. L. Stanghellini, J. A. Walsh, N. G. Douglas, Springer, p. 209 (2006)
  abstract (HTML) article(PDF)

  2005

• Planetary Nebulae as a Chemical Evolution Tool: Abundance Gradients, W. J. Maciel, L. G. Lago, R. D. D. Costa, Planetary Nebulae as Astronomical Tools, ed. R. Szczerba, G. Stasinska, S. Gorny, AIP, 246-249 (2005)
  abstract (HTML) article(PDF)

• Planetary Nebulae and the chemical evolution of the galactic bulge, R. D. D. Costa, A. V. Escudero, W. J. Maciel, Planetary Nebulae as Astronomical Tools, ed. R. Szczerba, G. Stasinska, S. Gorny, AIP, 252-255 (2005)
  abstract (HTML) article(PDF)

• A new determination of the rotation curve from galactic disk planetary nebulae, W. J. Maciel, L. G. Lago, Rev. Mex. Astron. Astrof. 41, 383 (2005)
  abstract (HTML) article(PDF)

• An estimate of the time variation of the abundance gradient from planetary nebulae II. Comparison with open clusters, cepheids and young objects, W. J. Maciel, L. G. Lago, R. D. D. Costa, Astronomy and Astrophysics 433, 127 (2005)
  abstract (HTML) article(PDF)

• Evolution from AGB to planetary nebula in the MSX survey, R. Ortiz, S. Lorenz-Martins, W. J. Maciel, E. M. Rangel, Astronomy and Astrophysics 431, 565 (2005)
  abstract (HTML) article(PDF)

  2004

• Chemical enrichment and star formation in the Milky Way disk III. Chemodynamical constraints, H.J. Rocha-Pinto, C. Flynn, J. Scalo, J. Häninnen, W.J. Maciel, G. Hensler, Astronomy and Astrophysics 423, 517 (2004)
  abstract (HTML) article(PDF)

• Abundances of planetary nebulae in the direction of the galactic anticenter, R.D.D. Costa, M.M.M. Uchida, W.J. Maciel
  Astronomy and Astrophysics 423, 199 (2004)
  abstract (HTML) article(PDF)
• New abundances of planetary nebulae in the Galactic Bulge, A.V. Escudero, R.D.D. Costa, W.J. Maciel
  Astronomy and Astrophysics 414, 211 (2004)
  abstract (HTML) article(PDF)

  2003

• PN and galactic chemical evolution, W.J. Maciel, R. D. D. Costa
  Planetary Nebulae, IAU Symp. 209, S. Kwok, M. Dopita, R. Sutherland (eds.), ASP, 551-558 (2003)
  abstract (HTML) article(PDF)

• An estimate of the time variation of the O/H radial gradient from planetary nebulae, W.J. Maciel, R.D.D. Costa, M.M.M. Uchida,
  Astronomy and Astrophysics 397, 667 (2003)
  abstract (HTML) article(PDF)

  2002

• Using Cepheids to determine the Galactic abundance gradient III. First results for the outer disc, S.M. Andrievsky, V.V. Kovtyukh, R.E. Luck, J.R.D. Lèpine, W.J. Maciel, Yu. V. Beletsky,
  Astronomy and Astrophysics 392, 491 (2002)
  abstract (HTML) article(PDF)

• Chromospherically young, kinematically old stars, H. J. Rocha-Pinto, B. V. Castilho, W.J. Maciel,
  Astronomy and Astrophysics 384, 912 (2002)
  abstract (HTML) article(PDF)

• Using Cepheids to determine the Galactic abundance gradient II. Towards the galactic center, S.M. Andrievsky, D. Bersier, V.V. Kovtyukh, R.E. Luck, W.J. Maciel, J.R.D. Lèpine, Yu. V. Beletsky,
  Astronomy and Astrophysics 384, 140 (2002)
  abstract (HTML) article(PDF)

• Using Cepheids to determine the Galactic abundance gradient I. The solar neighbourhood, S.M. Andrievsky, V.V. Kovtyukh, R.E. Luck, J.R.D. Lèpine, D. Bersier, W.J. Maciel, B. Barbuy, V.G. Klochkova, V.E. Panchuk, R.U. Karpischek,
  Astronomy and Astrophysics 381, 32 (2002)
  abstract (HTML) article(PDF)

• Radial gradients and metallicities in the galactic disk, W.J. Maciel,
  Ionized gaseous nebulae, Rev. Mexicana Astron. Astrof. S. Conf. 12, 207 (2002)
  abstract (HTML) article(PDF)

  2001

• He contamination from planetary nebula progenitor stars: the He/H radial gradient and the Delta Y/Delta Z enrichment ratio, W.J. Maciel, Astrophys. Space Sci. 277, 545 (2001)
  abstract (HTML) article(PDF)

• Radial abundance gradients as a constraint of the [O/Fe] x [Fe/H] relation in the galactic disk, W.J. Maciel
  New Astronomy Reviews 45, 571 (2001)
  abstract (HTML) article(PDF)

• Gravity distances of planetary nebulae II. Application to a sample of galactic objects, J.O. Cazetta, W.J. Maciel, Astrophys. Space Sci. 277, 393 (2001)
  abstract (HTML) article (PDF)

  2000

• Planetary nebulae: abundances and abundance gradients, W.J. Maciel, The evolution of the Milky Way: stars versus clusters, F. Matteucci, F. Giovannelli (eds.), Kluwer, 81 (2000)
  abstract (HTML) article(PDF)

• Some aspects of the chemical evolution of 4He in the Galaxy: the He/H radial gradient and the Delta Y/Delta Z enrichment ratio, W.J. Maciel, the light elements and their evolution, IAU Symposium 198, L. da Silva, M. Spite, J. R. de Medeiros (eds.), ASP, 204 (2000)
  abstract (HTML) article(PDF)

• Chemical enrichment and star formation in the Milky Way disk I. Sample description and chromospheric age-metallicity relation,
  H.J. Rocha-Pinto, W.J. Maciel, J. Scalo, C. Flynn, Astronomy and Astrophysics 358, 850 (2000)
  abstract (HTML) article(PDF)

• Chemical enrichment and star formation in the Milky Way disk II. Star formation history, H.J. Rocha-Pinto, J. Scalo, W.J. Maciel, C. Flynn, Astronomy and Astrophysics 358, 869 (2000)
  abstract (HTML) article(PDF)

• An intermittent star formation history in a "normal" disk galaxy: The Milky Way, H.J. Rocha-Pinto, J. Scalo, W.J. Maciel, C. Flynn, Astrophys. J. Lett. 531, L115 (2000)
  abstract (HTML) article (PDF)

• Observations of planetary nebulae in the Galactic Bulge, F. Cuisinier, W.J. Maciel, J. Köppen, A. Acker, B. Stenholm, Astronomy and Astrophysics 353, 543 (2000)
  abstract (HTML) article(PDF)

• Distances of galactic planetary nebulae based on a relationship between the central star mass and the N/O abundance ratio, J.O. Cazetta, W.J. Maciel, Rev. Mex. Astron. & Astrof. 36, 3 (2000)
  abstract (HTML) article (PDF)

  1999

• Metallicity distribution of bulge planetary nebulae and the [O/Fe] x [Fe/H] relation,
  W.J. Maciel, Astronomy and Astrophysics 351, L49 (1999)
  abstract (HTML) article(PDF)

• Abundance gradients in the outer galactic disk from planetary nebulae,
  W.J. Maciel, C. Quireza
  Astron. Astrophys. 345, 629 (1999)
  abstract (HTML) article(PDF) table 1

  1998

• Consistency of the metallicity distribution of nearby F, G and K dwarfs,
  H. J. Rocha-Pinto, W. J. Maciel
  Astron. Astrophys. 339, 791 (1998)
  abstract (HTML) article(PDF)

• Determination of the IMF on the basis of a recently derived SFR history in the solar neighbourhood,
  W. J. Maciel, H. J. Rocha-Pinto
  Monthly Notices Roy. Astron. Society 299, 889 (1998)
  abstract (HTML) article(PDF)

• Metallicity effects on the chromospheric activity-age relation for late-type dwarfs,
  H. J. Rocha-Pinto, W. J. Maciel
  Monthly Notices Roy. Astron. Society 298, 332 (1998)
  abstract (HTML) article(PDF)

• The production and depletion rates in models for the chemical evolution of the Galaxy,
  L.I. Arany-Prado, W. J. Maciel,
  Rev. Mexicana Astron. Astrofis. 34, 21 (1998)
  abstract (HTML) article(PDF)

  1997

• Gravity distances of planetary nebulae,
  W. J. Maciel, J. O. Cazetta
  Astrophys. Space Sci. 249, 341 (1997)
  abstract (HTML) article(PDF)

• History of the star formation in the local disk from the G dwarf metallicity distribution,
  H. J. Rocha-Pinto, W. J. Maciel
  Monthly Notices Roy. Astron. Society 289, 882 (1997)
  abstract (HTML) article(PDF)

• The G dwarf metallicity distribution and the problem of stellar lifetimes lower than the disk age,
  H. J. Rocha-Pinto, W. J. Maciel
  Astron. Astrophys. 325, 523 (1997)
  abstract (HTML) article(PDF)

• The history of the star formation rate in the local disk,
  H. J. Rocha-Pinto, W. J. Maciel
  in Star formation - near and far, ed. S.S. Holt, L.G. Mundy, IOP, 437 (1997)
  abstract (HTML)

• Chemical abundances for a planetary nebulae sample located outside the solar circle,
  R. D. D. Costa, C. Chiappini, W. J. Maciel, J. A. Freitas Pacheco
  in Advances in stellar evolution, ed. R. Rood, A. Renzini, Cambridge University Press, Cambridge, 159 (1997)
  abstract (HTML)

• Abundance gradients from planetary nebulae in the galactic disk,
  W. J. Maciel
  in Planetary Nebulae, IAU Symp. 180, eds. H. J. Habing, H. J. G. L. M. Lamers, Kluwer, Dordrecht 397-404 (1997)
  abstract (HTML) article(PDF)

  1996

• Abundance gradients in the Galaxy,
  W. J. Maciel
  in Stellar Abundances, eds. B. Barbuy, W. J. Maciel, J. C. Gregório-Hetem, IAG/USP, São Paulo, 79 (1996)
  abstract (HTML)

• The metallicity distribution of G dwarfs and the history of the SFR in the solar neighbourhood,
  H. J. Rocha-Pinto, W. J. Maciel
  in Stellar Abundances, eds. B. Barbuy, W. J. Maciel, J. C. Gregório-Hetem, IAG/USP, São Paulo, 67 (1996)
  abstract (HTML)

• AGB stars: densities and formation rates obtained from OH/IR stars,
  R. Ortiz, W. J. Maciel
  Astron. Astrophys. 313, 180 (1996)
  abstract (HTML) article(PDF)

• The rotation curve of the Galaxy obtained from planetary nebulae and AGB stars,
  L. H. Amaral, R. Ortiz, J. R. D. Lépine, W. J. Maciel
  Monthly Notices Roy. Astron. Soc. 281, 339 (1996)
  abstract (HTML) article(PDF)

• New abundances of southern planetary nebulae,
  R. D. D. Costa, C. Chiappini, W. J. Maciel, J. A. Freitas Pacheco
  Astron. Astrophys. Suppl. 116, 249 (1996)
  abstract (HTML) article(PDF)

• The metallicity distribution in the solar neighbourhood,
  H. J. Rocha-Pinto, W. J. Maciel
  Monthly Notices Roy. Astron. Soc. 279, 447 (1996)
  abstract (HTML) article(PDF)

  1995

• The evolution of radial abundance gradients in the Galaxy,
  C. Chiappini, W. J. Maciel
  in The formation of the Milky Way, eds. E. Alfaro, A. J. Delgado, Cambridge, 171 (1995)
  abstract (HTML)

• New kinematic distances of NGC 7009 and BD+303639 from UV and radio data,
  W. J. Maciel
  Astrophys. Space Sci. 229, 203 (1995)
  abstract (HTML) article(PDF)

  1994

• Hbeta luminosities of planetary nebula central stars,
  W. J. Maciel, J. O. Cazetta
  Astrophys. Space Sci. 222, 147 (1994)
  abstract (HTML)

• Abundances and radial gradients from disk planetary nebulae: He, N, C, and Cl,
  W. J. Maciel, C. Chiappini
  Astrophys. Space Sci. 219, 231 (1994)
  abstract (HTML)

• A model for the chemical evolution of the Galaxy with refuses,
  H. J. Rocha-Pinto, L. I. Arany-Prado, W. J. Maciel
  Astrophys. Space Sci. 211, 241 (1994)
  abstract (HTML)

• Location of PN central stars on the HR diagram,
  J. O. Cazetta, W. J. Maciel
  Astron. Astrophys. 290, 936 (1994)
  abstract (HTML) article(PDF)

• Planetary nebulae and the helium-to-metals enrichment ratio,
  C. Chiappini, W. J. Maciel
  Astron. Astrophys. 288, 921 (1994)
  abstract (HTML) article(PDF)

• The OH/IR-planetary nebula connection: space distribution and kinematics,
  R. Ortiz, W. J. Maciel
  Astron. Astrophys. 287, 552 (1994)
  abstract (HTML) article(PDF)

• Abundance gradients from disk planetary nebulae: O, Ne, S, and Ar,
  W. J. Maciel, J. Köppen
  Astron. Astrophys. 282, 436 (1994)
  abstract (HTML) article(PDF)

  1993

• Metal-poor planetary nebulae: effects of winds,
  W. J. Maciel
  Astrophys. Space Sci. 209, 65 (1993)
  abstract (HTML) article(PDF)

• Space distribution and metallicities of globular clusters,
  W. J. Maciel
  Astrophys. Space Sci. 206, 285 (1993)
  abstract (HTML) article(PDF)

• Abundances of non-type I planetary nebulae in the LMC,
  J. A. Freitas Pacheco, R. D. D. Costa, W. J. Maciel
  Astron. Astrophys. 279, 567 (1993)
  abstract (HTML) article(PDF)

• He2-90: a southern planetary nebula with low metal abundances,
  R. D. D. Costa, J. A. Freitas Pacheco, W. J. Maciel
  Astron. Astrophys. 276, 184 (1993)
  abstract (HTML) article(PDF)

• Galactic abundance gradients: application of the simple model of chemical evolution,
  W. J. Maciel
  Nuclei in the cosmos, ed. F. Käppeler, K. Wisshak, IOP Publishing, 465 (1993)
  abstract (HTML)

  1992

• Nebular abundances and the chemical evolution of the Galaxy,
  W. J. Maciel
  Elements and the cosmos, ed. M. G. Edmunds, R. J. Terlevich, Cambridge University Press, 210 (1992)
  abstract (HTML)

• Radial abundance gradients and the simple model of chemical evolution of the Galaxy,
  W. J. Maciel
  Astrophys. Space Sci. 196, 23 (1992)
  abstract (HTML)

• Kinematics of disk planetary nebulae,
  W. J. Maciel, C. M. Dutra
  Astron. Astrophys. 262, 271 (1992)
  abstract (HTML) article(PDF)

• Chemical abundances of disk planetary nebulae,
  J. A. Freitas Pacheco, W. J. Maciel, R. D. D. Costa
  Astron. Astrophys. 261, 579 (1992)
  abstract (HTML) article(PDF)

  1991

• Abundances of southern Type I planetary nebulae,
  J. A. Freitas Pacheco, W. J. Maciel, R. D. D. Costa, B. Barbuy
  Astron. Astrophys. 250, 159 (1991)
  abstract (HTML) article(PDF)

  1990

• Metal-poor planetary nebulae with low mass central stars,
  W. J. Maciel, J. A. Freitas Pacheco, S. J. Codina-Landaberry
  Astron. Astrophys. 239, 301 (1990)
  abstract (HTML) article(PDF)

• Strongly metal deficient planetary nebulae,
  W. J. Maciel, J. A. Freitas Pacheco, S. J. Codina-Landaberry
  Rev. Mexicana Astron. Astrofis. 21, 517 (1990)
  abstract (HTML) article(PDF)

• Determination of the galactic rotation curve based on planetary nebulae,
  C. M. Dutra, W. J. Maciel
  Rev. Mexicana Astron. Astrofis. 21, 264 (1990)
  abstract (HTML) article(PDF)

• New results on the determination of the pregalactic helium abundance,
  W. J. Maciel, C. C. M. Leite
  Rev. Mexicana Astron. Astrofis. 21, 197 (1990)
  abstract (HTML) article(PDF)

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