CHROMOSPHERIC ACTIVITY OF SOUTHERN STARS FROM THE MAGELLAN PLANET SEARCH PROGRAM

Journal Article · Fri Jun 10 00:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/734/1/70· OSTI ID:21576651

Arriagada, Pamela ^[1]

---

1. Department of Astronomy, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago 22 (Chile)

I present chromospheric-activity measurements of {approx}670 F, G, K, and M main-sequence stars in the Southern Hemisphere, from {approx}8000 archival high-resolution echelle spectra taken at Las Campanas Observatory since 2004. These stars were targets from the Old Magellan Planet Search, and are now potential targets for the New Magellan Planet Search that will look for rocky and habitable planets. Activity indices (S values) are derived from Ca II H and K line cores and then converted to the Mount Wilson system. From these measurements, chromospheric (log R'{sub HK}) indices are derived, which are then used as indicators of the level of radial-velocity jitter, age, and rotation periods these stars present.

• OSTI ID: 21576651
• Journal Information: Astrophysical Journal, Vol. 734, Issue 1; Other Information: DOI: 10.1088/0004-637X/734/1/70; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
CHROMOSPHERE
MAIN SEQUENCE STARS
RADIAL VELOCITY
ROTATION
SOUTHERN HEMISPHERE
ATMOSPHERES
EARTH PLANET
MOTION
PLANETS
SOLAR ATMOSPHERE
STARS
STELLAR ATMOSPHERES
VELOCITY