The APM survey for cool carbon stars in the Galactic halo. I

Details The APM survey for cool carbon stars in the Galactic halo. I The APM survey for cool carbon stars in the Galactic halo. I

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.294....1t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 294, p. 1

Astronomy and Astrophysics

Astronomy

79

Carbon Stars, Cool Stars, Galactic Halos, Sky Surveys (Astronomy), Milky Way Galaxy, Stellar Spectrophotometry, Star Formation

Scientific paper

A byproduct of the APM high-redshift quasar survey was the discovery of several distant (20-100 kpc) N-type carbon stars at high galactic latitude. Following on from this, we have started a systematic all-sky survey at galactic latitudes /b/ greater than 30 deg to find further examples of these rare objects, and we report here on the results from the first season of follow-up spectroscopy. Faint, high-latitude carbon (FHLC) giants make excellent probes of the kinematic structure of the outer Galactic halo. Therefore, in addition to detailed spectrophotometry covering a wide wavelength range, we have obtained high-resolution (about 1 A) spectra centered on the CN bands at about 8000 A, and have derived accurate radial velocities for the known FHLC stars. From the initial phase of our survey covering about 6500 sq deg, we find a surface density of faint N-type carbon stars in the halo of about 1 per 200 sq deg, roughly a factor of 4 less than the surface density of CH-type carbon stars in the halo. Intermediate-age, N-type carbon stars seem unlikely to have formed in the halo in isolation from other star-forming regions, and one possibility that we are investigating is that they either arise from the disruption of tidally captured dwarf satellite galaxies or are a manifestation of the long-sought optical component of the Magellanic Stream.

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