Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-12T21:35:46.351Z Has data issue: false hasContentIssue false
  • English
  • Français

Spectroscopic Radial Velocities: Photospheric Lineshifts Calibrated By Hipparcos

Published online by Cambridge University Press:  14 August 2015

D. Gullberg  and
D. Dravins
D. Gullberg
Affiliation:
Lund Observatory, Box A3, SE-22100 Lund, Sweden
D. Dravins
Affiliation:
Lund Observatory, Box A3, SE-22100 Lund, Sweden

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Wavelengths of stellar spectral lines depend not only on the star’s motion. Until recently, accurate studies of shifts not caused by radial motion were feasible only for the Sun. Solar lineshifts are interpreted as gravitational redshift (636 m/s) and convective blueshifts (~ 400 m/s; caused by velocity-brightness correlations). In other stars, such effects may be greater (Dravins & Nordlund 1990). Accurate astrometric radial velocities are now available from Hipparcos (Dravins et al. 1997a; 1997b), permitting studies of such shifts also in some other stars.

For such stars in the open clusters of Hyades, Ursa Major and Coma Berenices, a spectroscopic program is in progress, analyzing wavelength shifts in groups of lines with different strengths, excitation potentials, etc., using the ELODIE high-precision radial-velocity instrument (Baranne et al. 1996) at Haute-Provence Observatory.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 564
Copyright
Copyright © Kluwer 1998

References

Baranne, A., et al. (1996) A&AS 119, 373 Google Scholar
Dravins, D., Nordlund, Å. (1990) A&A 228, 203 Google Scholar
Dravins, D., Lindegren, L., Madsen, S., Holmberg, J. (1997a), HIPPARCOS Venice ’97, ESA SP-402, p. 733 Google Scholar
Dravins, D., Lindegren, L., Madsen, S., Holmberg, J. (1997b) Highlights of Astronomy 11 (this volume)Google Scholar
Further project description: http://www.astro.lu.se/~dainis/ Google Scholar