Precise radial velocity measurements of G and K giants. First results

Details Precise radial velocity measurements of G and K giants. First results Precise radial velocity measurements of G and K giants. First results

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...397.1151s&link_type=abstract

Astronomy and Astrophysics, v.397, p.1151-1159 (2003)

Astronomy and Astrophysics

Astrophysics

23

Stars: Late-Type, Stars: Variables: General, Techniques: Radial Velocities

Scientific paper

We present the first results of our precise radial velocity (RV) measurements of G and K giants. A number of stars from our list of 80 targets have been observed for 14 months using the fibre-fed echelle spectrograph FEROS at the 1.52 m ESO telescope in La Silla, Chile. This sample increases the number of giants surveyed with precise stellar radial velocity measurements at least by a factor of 10. During this period we are able to estimate the long-term accuracy of our measurement as better than 11 m s-1. We use the simultaneous Th-Ar calibration and cross-correlation technique to compute the radial velocity by applying a numerical template for K-type stars. Standard deviation sigma of mean radial velocity variations between 3 m s-1 and 4 km s-1 with timescales between several days and years are measured for 21 of G and K giants which are presented in this paper. Fifteen stars show definite variability above 3 sigma of our measurement uncertainties. Two stars with RV variations above 800 m s-1 are tentatively identified as new binaries. Although definitive trends between RV variations and stellar evolutionary status cannot yet be established, all the luminous cool giants of our sample seem to have significant radial velocity variations, while those stars in the giant's clump region can be either variable or constant.
Based on observations collected at the ESO 1.52 m telescope at the La Silla Observatory under program ESO No. 64.L-0047, 65.L-0571, 66.D-0592 and from Nov. 99 to Feb. 01 under the ESO-Observatório Nacional, Brazil, agreement.}

Affiliated with

Also associated with

No associations

Rating

Precise radial velocity measurements of G and K giants. First results 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 Precise radial velocity measurements of G and K giants. First results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precise radial velocity measurements of G and K giants. First results will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1524440