1986/10/01 by S. Beckwith, A. I. Sargent, N. Z. Scoville +3 · 1 citation
Physics and Astronomy · #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #Astronomy and Astrophysical Research
paper · doi:10.1086/164645
openalex publication_date 1986/10/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Interferometric observations of CO (J = 1-0) emission in HL Tau and R Mon reveal small-scale concentrations of molecular gas coincident with both stars. The line widths are small, less than 3 km/s, and centered close to the stellar velocities, indicating that these condensations are bound to the stars. Lower limits to the circumstellar masses are derived from the CO measurements. HL Tau is also a source of 2.7 mm continuum radiation, which probably originates from dust near the star. Depending upon the dust emissivity law adopted, the continuum flux implies a total mass of gas and dust of 0.01 to 0.2 solar mass. These results, combined with near infrared speckle interferometry, suggest that both stars are embedded in disks with sizes and masses similar to those of the primitive solar nebula.