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Carbon stars at high Galactic latitude

Bothun, Greg and Elias, J. H. and MacAlpine, G. and Matthews, K. and Mould, J. R. and Neugebauer, G. and Reid, I. N. (1991) Carbon stars at high Galactic latitude. Astronomical Journal, 101 (6). pp. 2220-2228. ISSN 0004-6256. doi:10.1086/115844.

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Photometry and kinematics are presented for a sample of objective prism selected carbon stars towards the north and south Galactic poles. Distances are determined by fitting the infrared colors to a giant branch. If these stars are like the carbon stars seen in dwarf spheroidal galaxies, the median distance of the sample is 28 kpc. If they are more like the carbon stars found recently in the Galactic bulge, they may be only half as distant. The surface density of carbon stars as a function of distance is remarkably consistent with an R^(1/4) density profile for the Galactic halo. This density profile can be traced to ≈ 15 scale radii and fills a volume similar to that occupied by globular clusters. The data yield an effective radius of either 7.0 or 3.5 kpc depending on choice of distance scale. The velocity dispersion of the sample is 96 + 12 km/s. A kinematic model in which vertical velocity dispersion is independent of height above the Galactic plane seems in best accord with the data.

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Mould, J. R.0000-0003-3820-1740
Additional Information:© 1991 American Astronomical Society. Received 5 December 1990; revised 6 February 1991. We thank Robert Wagner for preparation of finding charts, Bruce Margon for communication of results prior to publication and Heather Morrison for helpful discussions. We thank the personnel of Palomar, Cerro Tololo, and Las Campanas Observatories for their assistance with the observations. Infrared astronomy at Palomar is supported by a grant from the National Science Foundation.
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Issue or Number:6
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Official Citation:Carbon stars at high Galactic latitude Bothun, Greg; Elias, J. H.; MacAlpine, G.; Matthews, K.; Mould, J. R.; Neugebauer, G.; Reid, I. N. Astronomical Journal (ISSN 0004-6256), vol. 101, June 1991, p. 2220-2228.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81617
Deposited By: Ruth Sustaita
Deposited On:20 Sep 2017 18:08
Last Modified:15 Nov 2021 19:44

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