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Faint M-Dwarfs and the Structure of the Galactic Disk

Reid, I. N. and Gizis, J. E. and Cohen, J. G. and Pahre, M. A. and Hogg, D. W. and Cowie, L. and Hu, E. and Songaila, A. (1997) Faint M-Dwarfs and the Structure of the Galactic Disk. Publications of the Astronomical Society of the Pacific, 109 (735). pp. 559-565. ISSN 0004-6280. doi:10.1086/133914.

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We use broadband photometry and low-resolution spectra of a complete sample of late-K and M dwarfs brighter than I=22 in three fields at high galactic latitude to study issues relating to galactic structure and large scale abundance gradients in the Galaxy. The observed starcounts in each field are a good match to the predictions of models based on deep starcount data in other intermediate-latitude fields, and these models identify the late-type stars as members of the Galactic disk. Abundances for these late type stars are estimated via narrowband indices that measure the strength of the TiO and CaH bands in their spectra. Our results show that the average abundance in the Galactic disk remains close to solar even at heights of more than 2 kpc above the Plane.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Gizis, J. E.0000-0002-8916-1972
Cohen, J. G.0000-0002-8039-4673
Hogg, D. W.0000-0003-2866-9403
Cowie, L.0000-0002-6319-1575
Additional Information:© 1997 Astronomical Society of the Pacific. Received 1996 December 21; accepted 1997 January 15. Based partly on observations obtained at the W. M. Keck Observatory, which is operated jointly by the California Institute of Technology and the University of California, partly on data from the 200-in. telescope at Palomar mountain, owned and operated by the California Institute of Technology, and partly on data from the 60-in. telescope at Palomar Mountain which is jointly owned by the California Institute of Technology and the Carnegie Institution of Washington. The Keck Telescope Project was made possible by a generous grant from the W. M. Keck Foundation. The contribution of I.N.R. to this research was supported partially by NSF Grant No. AST-9412463; M.A.P. was supported by NSF Award No. AST-9157412 and the Bressler Foundation; D.W.H. was supported by NSF Award No. AST-9529170.
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
NSFAST 9412463
Bressler FoundationUNSPECIFIED
Issue or Number:735
Record Number:CaltechAUTHORS:20190530-081630521
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Official Citation:I. N. Reid et al 1997 PASP 109 559
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95948
Deposited By: Tony Diaz
Deposited On:30 May 2019 15:23
Last Modified:16 Nov 2021 17:17

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