RADIO CONTINUUM FROM FU ORIONIS STARS

• Published in: Publications of the Astronomical Society of the Pacific Vol. 102; no. 658; pp. 1413 - 1417
• Main Authors: RODRÍGUEZ, LUIS F., HARTMANN, LEE W., CHAVIRA, ENRIQUE
• Format: Journal Article
• Language: English
• Published: Chicago, IL The Astronomical Society of the Pacific 01.12.1990; University of Chicago Press
• Subjects: 640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources; Astronomical objects; Astronomy; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMIC RADIO SOURCES; Dust emissions; Earth, ocean, space; ELECTROMAGNETIC RADIATION; Exact sciences and technology; GIANT STARS; IONIZATION; Long-period variables (miras) and semiregulars; LUMINOSITY; Observatories; Optical bursts; OPTICAL PROPERTIES; PHOTOGRAPHY; PHYSICAL PROPERTIES; Pre main sequence stars; RADIATIONS; Radio astronomy; Radio continuum emission; RADIOWAVE RADIATION; STAR EVOLUTION; STARS; Stellar luminosities; SUPERGIANT STARS; Variable and peculiar stars (including novae); Very Large Array; Continuum; Flux density; Premain sequence star; Radio radiation; VLA observation; Data table; Radiosource; FU Orionis star; Radio interferometric observation
• ISSN: 0004-6280; 1538-3873
• DOI: 10.1086/132784

Using the Very Large Array we conducted a sensitive search for 3.6-cm continuum emission toward four FU Orionis objects: FU Ori, V1515 Cyg, V1057 Cyg, and Elias 1-12. We detected V1057 Cyg and Elias 1-12 at the level of ~ 0.1 mjy. The association of radio continuum emission with these FU Ori objects strengthens a possible relation between FU Ori stars and objects like L 1551 1RS 5 and Z CMa that are also sources of radio continuum emission and have been proposed as post-FU Ori objects. We discuss whether the radio continuum emission is caused by free-free emission from ionized éjecta or if it is optically thin emission from a dusty disk. We also were able to find, in the archives ofthe Tonantzintla Observatory, a plate taken in 1957 that does not show Elias 1-12. This result significantly narrows the time range for the epoch ofthe outburst of this source to between 1957 and 1965.