The reflection nebula around HD 26676

Bibcode
1989A&A...218..243C
Centurion, M.; Vladilo, G.
Bibliographical reference

Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 243-251.

Advertised on:
7
1989
Number of authors
2
IAC number of authors
1
Citations
4
Refereed citations
4
Description
The gaseous component of the reflection nebula surrounding HD 26676 is investigated by comparing the UV spectrum of the star with that of the foreground star HD 26793. The physical properties of the cloud are constrained under the assumption of Mg photoionization and H ionization by cosmic rays and taking into account the effect of the stellar radiation field on the Mg(0) ionization rate. The average ionization rate is obtained as a function of the extension of the nebula along the line of sight to the embedded star (R). The values determined for the temperature, the mean density, and R for a cosmic ray ionization rate of about 10 to the -16th/s are found to be typical of diffuse H-I regions.
Type
Refereed
Cosmic rays
Reflection nebulae

It may interest you

  • Refereed
    The discovery space of ELT-ANDES. Stars and stellar populations

    The ArmazoNes high Dispersion Echelle Spectrograph (ANDES) is the optical and near-infrared high-resolution echelle spectrograph envisioned for the Extremely Large Telescope (ELT). We present a selection of science cases, supported by new calculations and simulations, where ANDES could enable major advances in the fields of stars and stellar

    Roederer, Ian U. et al.

    Advertised on:

    4
    2024
    Bibcode
    2024ExA....57...17R
    Citations
    0
  • Refereed
    Euclid preparation. XXXVI. Modelling the weak lensing angular power spectrum

    This work considers which higher order modeling effects on the cosmic shear angular power spectra must be taken into account for Euclid. We identified the relevant terms and quantified their individual and cumulative impact on the cosmological parameter inferences from Euclid. We computed the values of these higher order effects using analytic

    Euclid Collaboration et al.

    Advertised on:

    4
    2024
    Bibcode
    2024A&A...684A.138E
    Citations
    4
  • Refereed
    The compact multi-planet system GJ 9827 revisited with ESPRESSO★

    GJ 9827 is a bright, nearby K7V star orbited by two super-Earths and one mini-Neptune on close-in orbits. The system was first discovered using K2 data and then further characterized by other spectroscopic and photometric instruments. Previous literature studies provide several mass measurements for the three planets, however, with large variations

    Passegger, V. M. et al.

    Advertised on:

    4
    2024
    Bibcode
    2024A&A...684A..22P
    Citations
    1