Letter | Published:

Angular Size of Radio Stars

Naturevolume 199page682 (1963) | Download Citation



THE existence of a number of radio sources with an angular extension less than 1″ is well known1. Some of them were identified with star-like objects and therefore they are referred to as radio stars. Among these are 3C-48, 3C-119, 3C-147, 3C-273, 3C-286. Their non-thermal spectra and the evidence of a rather strong linear polarization suggest the synchrotron mechanism of radio emission. Twiss2, Razin3, and Le Roux4 have shown that a self-absorption of synchrotron radiation by relativistic electrons must occur at frequencies f < f1, f1 depending on relativistic electrons concentration, normal component of magnetic field H, spectral index of radio emission α (the spectrum being of the form S(f) f−a), and on linear dimension of radio-emitting region. At frequencies below f1 the spectrum of radio emission is S(f) f2.5 whatever α is, thus f1 is a frequency where maximum flux density of a radio source occurs.

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  1. 1

    Allen, L. R., Anderson, B., Conway, R. G., Palmer, H. P., Reddish, V. C., and Rowson, B., Mon. Not. Roy. Astro. Soc., 124, 477 (1962).

  2. 2

    Twiss, R. Q., Phil. Mag., 45, 249 (1954).

  3. 3

    Razin, V. A., Izvestya Vyssh. Uch. Zav., sez. ‘Radiophysica’, 3, 584 (1960).

  4. 4

    Le Roux, E., Ann. d'Astrophys., 24, 71 (1961).

  5. 5

    Conway, R. G., Kellermann, K. I., and Long, R. J., Mon. Not. Roy. Astro. Soc., 125, 313 (1963).

  6. 6

    Kellermann, K. I., Long, R. J., Allen, R. J., and Moran, M., Nature, 195, 692 (1962).

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  1. Sternberg State Astronomical Institute, Moscow

    • V. I. SLISH


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