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  1. No Access

    Article

    Photometric Studies of O-type Hot Subdwarfs

    We present a photometric study of eight sdOs and one sdOB on which simultaneous photometry in four Strömgren filters was performed. Our study seeks to detect the possible pulsators among the candidates.

    C. Rodríguez López, A. Ulla, R. Garrido, M. Manteiga… in Astrophysics and Space Science (2004)

  2. No Access

    Article

    Hot Subdwarfs: Magnetic, Oscillatory and Other Physical Properties

    Hot subdwarf stars (hot sds) are blue subluminous objects. Only a few determinations areavailable to date regarding the study of such aspects as rotation,microturbulent velocities or the magnetic nature of the...

    R. Oreiro, F. Pérez Hernández, M. Manteiga, A. Ulla… in Astrophysics and Space Science (2003)

  3. No Access

    Article

    A Closer View of the Nucleus of NGC 4314

    We present a high-resolution kinematical study of the ionized gas in the circumnuclear region of NGC 4314. Our spectra reveal the presence of a central structure (apparently a ring or torus) located at ∼ 2 arc...

    P. Pişmiş, L. Colombón, A. Mampaso, M. Manteiga in Astrophysics and Space Science (2001)

  4. No Access

    Article

    Optical Classification of IRAS Post-AGB Candidates

    We present the first results of a survey carried out on a sample of optically bright post-AGB candidates selected from the IRAS Point Source Catalogue, many of them previously unidentified in the literature. T...

    O. Suárez, M. Manteiga, A. Ulla, P. García-Lario… in Astrophysics and Space Science (1998)

  5. No Access

    Article

    Infrared photometry of open clusters: the main sequence of NGC 752

    New infrared photometry of a sample of 39 stars in the open cluster NGC 752 is presented. These observations confirm the bimodality of the Main Sequence previously reported. We analyze the nature of this behav...

    S. Arribas, M. Manteiga, C. Martinez Roger, E. Paez… in Astrophysics and Space Science (1990)