Infrared velocities of long period variables: CO ?v = 3 in four Miras and five SR variables
- Author(s)
- Kenneth H. Hinkle, Thomas Lebzelter, W W G Scharlach
- Abstract
Time series of high resolution spectra have been obtained for a set of 9 long period variables (LPVs), 4 Miras, and 5 semiregular variables (SRVs) in the 1.6-1.8 œm infrared. The vibration-rotational lines of CO ?v = 3 in this spectral interval have previously been shown to be good probes of the pulsational properties of cool variable stars. We use these spectral lines to show the differences and similarities in the radial velocity amplitude and excitation temperature among the Mira, SRa-, and SRb-type variables. All Miras of our sample show similar radial velocity variations and similar amplitudes independent of their period. The SRVs differ from the Miras by significantly lower amplitudes. All the LPVs show random velocity changes at the few km s-1 level. We find a correlation between radial velocity amplitude and visual amplitude. Œ 1997 The American Astronomical Society.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- National Optical Astronomy Observatory, Tucson, National Radio Astronomy Observatory Socorro
- Journal
- The Astronomical Journal
- Volume
- 114
- Pages
- 2686-2699
- No. of pages
- 14
- ISSN
- 0004-6256
- Publication date
- 1997
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/2987a47d-d58a-4f21-83ee-a17093ecaf86