Velocity variability of semiregular and irregular variables

Details Velocity variability of semiregular and irregular variables Velocity variability of semiregular and irregular variables

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...393..563l&link_type=abstract

Astronomy and Astrophysics, v.393, p.563-571 (2002)

Astronomy and Astrophysics

Astrophysics

14

Stars: Variables: General, Stars: Late-Type, Stars: Agb And Post-Agb, Stars: Atmospheres

Scientific paper

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 Aql is found to be the first SRV showing line doubling.

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