Laser action in stellar envelopes

Abstract

Abstract. It is shown that in high-temperature stars in which high speed mass loss is occurring, the rapidly recombining plasma in the stellar envelope can act as an amplifying medium. Model calculations for laser action in He 11 1-4686, using the collisional-radiative model, are presented. Menzel's hypothesis of laser action in distended stellar atmospheres is shown to be fully substantiated. The relevance of these results in resolving the problem of intensity anomalies in the spectra of WolfRayet stars is pointed out.

Chance coincidences and the so-called redshift systems in the absorption spectrum of PKS 0237-23

“…All the observational evidence on quasars either supports our theory, or is consistent with it (Varshni, 1979). Clearly, the claims of BSBC require examination.…”

“…We have proposed a theory of quasars (Varshni, 1973(Varshni, , 1974a(Varshni, , 1975a(Varshni, , 1977a(Varshni, , b, 1978(Varshni, , 1979Varshni and Lam, 1976), based on sound physical principles, which does not need the artificial assumption of redshifts and provides satisfactory explanations of the various phenomena associated with quasars. All the observational evidence on quasars either supports our theory, or is consistent with it (Varshni, 1979).…”

The quasar 0805+046 as a helium-rich shell star

“…1 and 3 between the times of observations of Osmer and Smith (1976) and those of Whelan et al (1979). Such a change is readily understandable on the PLS model (Varshni, 1975a(Varshni, , 1979 …”

“…This theory is known as the plasma-laser star (PLS) model of quasars. Most of the observational evidence on quasars either supports our theory or else is consistent with it (Varshni, 1979(Varshni, ,1982. We have analysed the emission line spectrum, the absorption line spectrum and the continuous energy distribution of the quasar 0805 + 046 (also known as 4C 05.34) in the framework of the PLS theory and we propose the following model for this quasar: it is a helium-rich (Hunger, 1975) shell star.…”

“…We have proposed a theory of quasars (Varshni, 1973(Varshni, , 1974a(Varshni, , 1975a(Varshni, , 1977a(Varshni, , b, 1978(Varshni, , 1979Varshni and Lam, 1976), based on sound physical principles, which does not need the artificial assumption of redshifts and provides satisfactory explanations of the various phenomena associated with quasars. This theory is known as the plasma-laser star (PLS) model of quasars.…”