Spectroscopic determination of intensities of umbral bright features and adjacent background

Bibcode
1992A&A...260..437S
Sobotka, M.; Bonet, J. A.; Vazquez, M.
Referencia bibliográfica

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 437-440.

Fecha de publicación:
7
1992
Número de autores
3
Número de autores del IAC
3
Número de citas
11
Número de citas referidas
9
Descripción
Profiles of the Na I D doublet in three bright features (clusters of umbral dots), located in a relatively dark umbra, were analyzed by means of the 'local two-component modeling' to obtain the 'true' continuum intensities and temperatures of the bright features and their dark surroundings (background). The intensities of two central and one peripheral bright feature were 0.31 (background 0.11), 0.33 (0.13), and 0.40 (0.17), respectively. For the ratio of the object and background intensity (assumed to be constant, but unknown until now) the value of 2.6 +/- 0.2 was obtained.
Tipo
Con árbitro
Manchas solares
Ambiente solar

Te puede interesar

  • Con árbitro
    Beyond the Nyquist frequency: Asteroseismic catalog of undersampled Kepler late subgiants and early red giants
    Subgiants and early red giants are crucial for studying the first dredge-up, a key evolutionary phase in which the convective envelope deepens, mixing previously interior-processed material and bringing it to the surface. Yet, very few have been seismically characterized with Kepler because their oscillation frequencies are close to the 30 minute
    Liagre, B. et al.

    Fecha de publicación:

    10
    2025
    Bibcode
    2025A&A...702A.144L
    Número de citas
    0
  • Con árbitro
    An ALMA Band 7 survey of SDSS/Herschel quasars in Stripe 82: I. The properties of the 870 micron counterparts
    Context. Over the past 15 years, studies of quasars in the far-infrared (FIR) have reported host luminosities ranging from 10 12 to 10 14 L ⊙. These luminosities, often derived from Herschel/SPIRE photometry, suggest star formation rates (SFRs) of up to several thousand M ⊙ yr ‑1, positioning them among the most luminous starburst galaxies in the
    Hatziminaoglou, E. et al.

    Fecha de publicación:

    10
    2025
    Bibcode
    2025A&A...702A.183H
    Número de citas
    0
  • Con árbitro
    Transit timing variations in HIP 41378: CHEOPS and TESS confirm a non-transiting sixth planet in the system
    In multiple-planet systems, gravitational interactions of exoplanets could lead to transit timing variations (TTVs), whose amplitude becomes significantly enhanced when planets are in or near mean-motion resonances (MMRs), making them more easily detectable. In cases where both TTVs and radial velocity (RV) measurements are available, combined
    Leonardi, P. et al.

    Fecha de publicación:

    10
    2025
    Bibcode
    2025A&A...702A.211L
    Número de citas
    0