Imaging the Circumstellar Envelopes Around Evolved Stars with the SMA

Details Imaging the Circumstellar Envelopes Around Evolved Stars with the SMA Imaging the Circumstellar Envelopes Around Evolved Stars with the SMA

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jkas...38..219h&link_type=abstract

Journal of the Korean Astronomical Society, vol. 38, no. 2, pp. 219-222

Astronomy and Astrophysics

Astronomy

Ism: Individual (V Hya, Vy Cma, &Pi, 1 Gru), Ism: Jets And Outflows, Ism: Molecules, Stars: Agb And Post-Agb

Scientific paper

We present the high-resolution (2''--4'') images of the molecular envelopes surrounding the evolved stars, V Hya, VY CMa, and π1 Gru observed with the Submillimeter Array. The CO J=2--1 and 3--2 images of the carbon star V Hya show that the circumstellar structure of this star consists of three kinematic components; there is a flattened disk-like envelope that is expanding with a velocity of ˜16 km s-1, the second component is the medium-velocity wind having a deprojected velocity of 40--120 km s-1 moving along the disk plane, and the third one is the bipolar molecular jet having an extreme velocity of 70--185 km s-1. The axis of this high velocity jet is perpendicular to the plane of the disk-like envelope. We found that the circumstellar structure of the S-star π1 Gru traced by the CO J=2--1 resembles that of V Hya quite closely; the star is surrounded by the expanding disk-like envelope and is driving the medium-velocity wind along the disk plane. We also obtained the excellent images of VY CMa with the CO and 13CO J=2--1 and SO 6_5--5_4 lines. The maps of three molecular lines show that the envelope has a significant velocity gradient in the east-west direction, suggesting that the envelope surrounding VY CMa is also flattened and expanding along its radial direction. The high-resolution images obtained with the SMA show that some AGB stars are associated with the asymmetric mass loss including the equatorial wind and bipolar jet.

Affiliated with

Also associated with

No associations

Rating

Imaging the Circumstellar Envelopes Around Evolved Stars with the SMA 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 the Circumstellar Envelopes Around Evolved Stars with the SMA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imaging the Circumstellar Envelopes Around Evolved Stars with the SMA will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1399452