Velocity variability of semiregular and irregular variables
- Author(s)
- Thomas Lebzelter, Kenneth H. Hinkle
- Abstract
We compare velocities from near infrared lines with center-of-mass velocities for a sample of semiregular and irregular variables to search for indications for a convective blueshift. It is shown that a general blueshift is present but that the light variability is obviously not dominated by convective cells but rather by stellar pulsation. All stars of our sample show a similar shape and amplitude in the velocity variations. Long secondary periods are a common feature in these objects and strongly influence the measured velocity shifts. The star V366 Aq1 is found to be the first SRV showing line doubling.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- National Optical Astronomy Observatory, Tucson
- Journal
- Astronomy & Astrophysics
- Volume
- 393
- Pages
- 563-571
- No. of pages
- 9
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361:20021085
- Publication date
- 2002
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/velocity-variability-of-semiregular-and-irregular-variables(cc19c15d-979f-48ce-8804-f190d309dc03).html