The Discovery of Nonthermal Radio Emission from Magnetic Bp--Ap Stars
Abstract
In a VLA survey of chemically peculiar B- and A-type stars with strong magnetic fields, five of the 34 stars observed have been identified as 6 cm continuum sources. Three of the detections are helium-strong early Bp stars (Sigma Ori E, HR 1890, and Delta Ori C), and two are helium weak, silicon-strong stars with spectral types near A0p (IQ Aur = HD 34452, Babcock's star = HD 215441). The 6 cm luminosities L6 (ergs/s Hz) range from log L6 = 16.2 to 17.9, somewhat less than the OB supergiants and W-R stars. Three-frequency observations indicate that the helium-strong Bp stars are variable nonthermal sources.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1987
- DOI:
- 10.1086/165784
- Bibcode:
- 1987ApJ...322..902D
- Keywords:
-
- A Stars;
- B Stars;
- Emission Spectra;
- Magnetic Stars;
- Nonthermal Radiation;
- Peculiar Stars;
- Radio Sources (Astronomy);
- Magnetic Field Configurations;
- Radio Emission;
- Stellar Radiation;
- Stellar Spectrophotometry;
- Thermal Radiation;
- Very Large Array (Vla);
- Astrophysics;
- RADIATION MECHANISMS;
- RADIO SOURCES: IDENTIFICATIONS;
- STARS: MAGNETIC;
- STARS: PECULIAR A;
- STARS: RADIO RADIATION