Radio emission from chemically peculiar stars

Details Radio emission from chemically peculiar stars Radio emission from chemically peculiar stars

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393..341l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 341-356.

Astronomy and Astrophysics

Astronomy

56

Peculiar Stars, Radio Emission, Radio Sources (Astronomy), Stellar Luminosity, Very Large Array (Vla), Circular Polarization, Early Stars, Late Stars, Stellar Temperature, Stellar Winds

Scientific paper

In five VLA observing runs the initial survey of radio emission from magnetic Bp-Ap stars by Drake et al. is extended to include a total of 16 sources detected at 6 cm out of 61 observed, giving a detection rate of 26 percent. Of these stars, three are also detected at 2 cm, four at 3.6 cm, and five at 20 cm. The 11 new stars detected as radio sources have spectral types B5-A0 and are He-weak and Si-strong. No classical (SrCrEu-type) Ap stars have yet been detected. The 16 detected sources show a wide range of radio luminosities with the early-B He-S stars on average 20 times more radio luminous than the late-B He-W stars and 1000 times more luminous than Theta Aurigae. Multifrequency observations indicate flat spectra in all cases. Four stars have a detectable degree of circular polarization at one or more frequencies. It is argued that the radio-emitting CP (chemically peculiar) stars form a distinct class of radio stars that differs from both the hot star wind sources and the active late-type stars. The observed properties of radio emission from these stars may be understood in terms of optically thick gyrosynchrotron emission from a nonthermal distribution of electrons produced in a current sheet far from the star. In this model the electrons travel along magnetic fields to smaller radii and higher magnetic latitudes where they mirror and radiate microwave radiation.

Affiliated with

Also associated with

No associations

Rating

Radio emission from chemically peculiar stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Radio emission from chemically peculiar stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio emission from chemically peculiar stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1204302