Cool carbon stars in the halo II. A study of 25 new objects

Abstract

We present new results from an ongoing survey of carbon-rich asymptotic giant (AGB) stars in the halo of our Galaxy. After selecting candidates primarily through their 2MASS colours, slit spectroscopy was achieved at the ESO NTT telescope. Twenty-one new AGB carbon stars were discovered, increasing the total of presently known similar AGB C stars to about 120. A further four were observed again in order to confirm their carbon-rich nature and measure radial velocities. Two main findings emerge from this work. First, we found a C star located at about 130 kpc from the Sun and at b = -62 degrees. This distant star is remarkably close (5 kpc) to the principal plane of the Stream of the Sagittarius dwarf galaxy, and is likely to be a tracer of a distant poorly populated southern warp of the Stream. etc etc

arXiv commentaccepted by Astronomy and Astrophysics

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Cited by in corpus (14)

• Spectroscopy of QUEST RR Lyrae Variables: the new Virgo Stellar Stream
• The cold veil of the Milky Way stellar halo
• CS 30322-023: an ultra metal-poor TP-AGB star?
• The Planetary Nebula population of the Sagittarius Dwarf Spheroidal Galaxy
• A "Light," Centrally-Concentrated Milky Way Halo?
• Tracing the tidal streams of the Sagittarius dSph, and halo Milky Way features, with carbon-rich long-period variables
• New observations of cool carbon stars in the halo
• The low wind expansion velocity of metal-poor carbon stars in the Halo and the Sagittarius stream
• An SiO Maser Search off the Galactic Plane
• The Most Distant Stars in the Milky Way
• A wide angle view of the Sagittarius dwarf Spheroidal Galaxy. I: VIMOS photometry and radial velocities across Sgr dSph major and minor axis
• Cool carbon stars in the halo: new very red or distant objects
• Cool carbon stars in the halo and in dwarf galaxies: Halpha, colours, and variabiity
• The dust and gas content of carbon stars toward the Galactic Halo