Vol. 25 No. 1 (1993)

J. A. Font, J. M. Ibanez, J. M. Marti

3

Numerical Simulations of Multidimensional Flows in Presence of either Strong Shocks or Strong Gravitational Fields

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A. L. Gyulbudaghian, L. F. Rodriguez, V. M. Villanueva

19-21

Nebulous objects on the ESO/SRC J plates.

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L. F. Rodriguez, J. Marti, J. Canto, J. M. Moran, S. Curiel

23-29

Possible radio spectral indices from inhomogeneous free-free sources.

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J. A. Garcia-Barreto, R. Carrillo, U. Klein, M. Dahlem

31-38

High frequency radio continuum observations of barred spiral galaxies.

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C. Allen, A. Santillan

39-50

New galactic orbits and tidal radii for globular clusters.

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J. Maza, M. T. Ruiz, L. E. Gonzalez, M. Wischnjewsky, R. Antezana

51-57

Calan-Tololo Survey. V. Two hundred new southern quasars.

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L. J. Sanchez, M. Peimbert

59

Errata - Scattered Light in M8

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J. Bohigas

59

Errata - on the Nature of GGD 25

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J. H. Peña, M. A. Hobart, E. Rodríguez

63-69

Observations and period variation analysis of the W UMa type star SW Lac.

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E. S. Parsamian, E. Chavira, G. González

71-73

New flare stars and repetitions in the Orion association region. II.

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R. Gil-Hutton

75

Photoelectric Photometry of Asteroids 58 Concordia, 122 Gerda, 326 Tamara, and 441 Bathilde

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V. Avila-Reese

79

Evolution of helium stars in massive close binary systems

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R. Gil-Hutton

91-94

The atmospheric extinction at Estacion Astronomica "Dr. Carlos Ulrrico Cesco".

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S. Biro, J. Canto, A. C. Raga, L. Binette

95

A Comparison Between Analytic and Numerical Results of a Steady Jet Model

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R. A. Ruelas-Mayorga, H. Noriega-Mendoza

103

Transformations Between the JHK IR Systems of the Observatorio Astronomico Nacional (oan) and the South African Astronomical Observatory (saao)

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E. Moreno, P. Pismis

111-115

A simple model to fit rotation curves.

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V. Quilis, J. M. Ibanez, D. Saez

117

Nonlinear Evolution of One Dimensional Cosmological Inhomogeneities

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J. H. Peña, R. Peniche, R. Mújica, C. Ibanoglu, A. Y. Ertan, O. Tumer, Z. Tunca, S. Evren

129-141

Photometry of open clusters. III. HR 4684 and HD 106103 in Coma Berenices.

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D. Dultzin-Hacyan, A. Ruelas-Mayorga, R. Costero

143-148

Simultaneous optical and IR monitoring of the Seyfert nucleus NGC 7469.

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A. C. Raga, A. Noriega-Crespo

149-153

The jet/environment density ratio of stellar jets.

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Research articles