Imaging of an Infalling Disklike Envelope around L1551 IRS 5

Details Imaging of an Infalling Disklike Envelope around L1551 IRS 5 Imaging of an Infalling Disklike Envelope around L1551 IRS 5

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473..464s&link_type=abstract

Astrophysical Journal v.473, p.464

Astronomy and Astrophysics

Astronomy

37

Stars: Circumstellar Matter, Radio Lines: Ism, Stars: Formation, Stars: Individual Alphanumeric: L1551 Irs 5, Stars: Pre-Main-Sequence

Scientific paper

Aperture synthesis observations of H13CO+ (J = 1-0) emission from L1551 IRS 5 were made using the Nobeyama Millimeter Array. It is found that the emission has a disklike structure with a size of 5600 x 2800 AU at P.A. = 160°. If we assume a geometrically thin disk, its radius and inclination angle are estimated to be 2800 AU and 60° [= cos-1 (2800/5600)], and the disk major axis is almost perpendicular to the molecular outflow. It is noted that there exists radial motion, i.e., velocity gradient along the disk minor axis in the inner region (r < 1000 AU). The motion can be interpreted as infalling motion because the blueshifted emission is located on the far side of the disk and the redshifted emission on the near side by considering the geometrical relation between the H13CO+ Feature and the bipolar outflow. The infalling velocity corrected for the inclination is estimated to be 0.6 km s-1 at r = 800 AU and is smaller than the free-fall velocity (˜1.5 km s-1 at r = 800 AU) with a stellar mass of 1 Msun. The 112 mass of the disk and the mass infall rate are estimated to be 0.27 Msun and ˜1.1 x 10 Msun yr-1 respectively. In addition to the infalling motion, the molecular emission also has a velocity structure along the major axis, suggesting rotating motion. The rotational velocity corrected for the inclination is estimated to be 0.23 km s-1 at r = 900 AU, which is smaller than Keplerian rotational velocity, suggesting that the envelope is not rotationally supported. The H13CO+ disklike structure would be a disklike infalling envelope around L1551 IRS 5.

Affiliated with

Also associated with

No associations

Rating

Imaging of an Infalling Disklike Envelope around L1551 IRS 5 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 Imaging of an Infalling Disklike Envelope around L1551 IRS 5, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imaging of an Infalling Disklike Envelope around L1551 IRS 5 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-819376