Spectroscopy of Nearby Stars earlier than M0 south of -30° Dec

Details Spectroscopy of Nearby Stars earlier than M0 south of -30° Dec Spectroscopy of Nearby Stars earlier than M0 south of -30° Dec

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop...33g&link_type=abstract

NOAO Proposal ID #2002A-0033

Astronomy and Astrophysics

Astrophysics

Scientific paper

As part of the Nearby Stars (NStars) / Space Interferometry Mission (SIM) Preparatory Science project, we are observing spectroscopically all of the approximately 3600 main-sequence and giant stars with spectral types earlier (hotter) than M0 in the Hipparcos catalog within a distance of 40 parsecs. These spectra, which we are obtaining with resolutions between 1.5 - 3.6A will be used to address a number of the scientific goals of the NStars project and the needs of the SIM and Terrestrial Planet Finder (TPF) programs. These goals and needs will be addressed by 1) using these spectra to obtain homogeneous, precision, MK spectral types for all of the stars in our sample; 2) providing, in conjunction with existing medium and broad- band photometry and synthetic spectra based on Kurucz models, good estimates of the basic astrophysical parameters of these stars, namely the effective temperature, gravity and metallicity and 3) using these spectra to obtain a measure of the chromospheric activity from the Ca II K line. We have had two runs on the 1.5m CTIO telescope for this project (Feb 2001 and August 2001) which enabled us to obtain spectra of 85% of the fainter stars (B > 9) in our sample. We are applying for time during this semester to complete this program of observation of the fainter stars and to obtain spectra of the bright stars (B < 9) south of -30 declination remaining in our sample. The small telescope in Argentina we had been planning to use for the brighter stars in our program is unavailable because of the severe economic problems in that country. However, there are compelling scientific reasons for completing the program on a single telescope.

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