CCD photometry of axisymmetric and non-axisymmetric Galactic bulges in the I-band

Bibcode
1990ESOC...35..285V
Varela, A. M.; Munoz-Tunon, C.; Beckman, J. E.; Prieto, M.; Cepa, J.
Referencia bibliográfica

IN: ESO/CTIO Workshop on Bulges of Galaxies, La Serena, Chile, Jan. 16-19, 1990, Proceedings (A92-18101 05-90). Garching, Federal Republic of Germany, European Southern Observatory, 1990, p. 285-288.

Fecha de publicación:
0
1990
Número de autores
5
Número de autores del IAC
5
Número de citas
1
Número de citas referidas
1
Descripción
The paper presents a set of CCD images of four Galactic bulges, taken in the I photometric band under very good imaging conditions, with the Taurus camera on the 4.2-m William Herschel Telescope. As well as showing calibrated isophotes, the results of ellipticity analysis are given, which bring out a clear dichotomy between two of the bulges, where a degree of triaxiality is implied, and the other two, which are much closer to axisymmetry. In the nonaxisymmetric cases, ellipticities and position angles vary rapidly with radius within the bulge. The presence of star-forming activity can be inferred, which is probably induced by an effect of the underlying asymmetry in the older stellar population.
Tipo
Sin árbitro
Galaxias con estallidos
Galaxias elípticas

Te puede interesar

  • Sin árbitro
    Massive characterisation of subgiants and red giants with TESS (Kepler and Gaia)
    TESS serves as a formidable tool for investigating stellar variability. Nonetheless, the adaptation of methodologies employed in other space missions, such as Kepler, to deduce long stellar rotation periods or solar-like stellar pulsations has been a challenge. The advent of multiple sectors of data for most stars every two years with the extended
    García, Rafael A. et al.

    Fecha de publicación:

    9
    2024
    Bibcode
    2024tkas.confE.123G
    Número de citas
    0
  • Sin árbitro
    a Study of Post-Agb Stars in the Light of GAIA DR3 Data
    Low and intermediate-mass stars evolve through the Post Asymptotic Giant Branch (post-AGB) phase before they reach the Planetary Nebulae stage. After leaving the Main Sequence, they undergo intense episodes of mass loss when in the Giant Branch and, then, they enter the post-AGB stage which is a rather puzzling stellar evolutionary phase . Also, it
    Manteiga, Minia et al.

    Fecha de publicación:

    8
    2024
    Bibcode
    2024IAUGA..32P1413M
    Número de citas
    0
  • Sin árbitro
    Unsupervised classification of RR Lyrae stars
    Big datasets are becoming increasingly important in astrophysics due to new surveys continuously observing our night sky. A prominent example of an observatory that will produce a large data stream is Vera C. Rubin LSST, designed to simultaneously monitor the southern night sky in six colors. Unsupervised machine learning (ML), a method of learning
    Steinwender, Lukas et al.

    Fecha de publicación:

    8
    2024
    Bibcode
    2024tkas.confE...2S
    Número de citas
    0