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The nature of unidentified 12 µm IRAS sources at high Galactic latitudes

Beichman, C. A. and Chester, T. and Gillett, F. C. and Low, F. J. and Matthews, K. and Neugebauer, G. (1990) The nature of unidentified 12 µm IRAS sources at high Galactic latitudes. Astronomical Journal, 99 (5). pp. 1569-1584. ISSN 0004-6256. https://resolver.caltech.edu/CaltechAUTHORS:20170920-095246973

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Abstract

A sample of 47 previously uncataloged objects detected at 12 µm by the Infrared Astromonical Satellite {IRAS), located above a Galactic latitude of 50° and selected to have relatively faint counterparts on the Palomar Observatory Sky Survey prints, has been studied using near-infrared photometry. The vast majority of the sample are distant (~3 kpc) red giant stars with spectral types later than about M6. These stars show 1-2 mag of excess at 12 µm, indicative of mild mass loss of about 10^(-7)-10^(-8) M_⊙ yr^(-1). The sample also contains one quasar, one oxygen-rich giant star undergoing rapid mass loss, and a remarkable cool (1230 K) carbon star. The absence of nearby, low-luminosity infrared sources in this sample limits the space density of field brown dwarf stars. The value of this limit depends on the unknown properties and distribution of ages and masses of brown dwarfs, and ranges from 0.12 M_⊙ pc^(-3), or comparable to the Oort limit for the local missing mass, up to 2.4 M_⊙ pc^(-3).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1086/115440DOIArticle
http://adsabs.harvard.edu/cgi-bin/bib_query?1990AJ.....99.1569BADSArticle
Alternate Title:The nature of unidentified 12 micron IRAS sources at high Galactic latitudes
Additional Information:© 1990 American Astronomical Society. Received 16 October 1989; revised 17 January 1990. Research supported by NASA IRAS Extended Mission Program.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASA IRAS Extended Mission ProgramUNSPECIFIED
Issue or Number:5
Record Number:CaltechAUTHORS:20170920-095246973
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170920-095246973
Official Citation:The nature of unidentified 12 micron IRAS sources at high Galactic latitudes Beichman, C. A., Chester, T., Gillett, F. C., Low, F. J., Matthews, K., & Neugebauer, G., , Astronomical Journal (ISSN 0004-6256), vol. 99, May 1990, p. 1569-1584.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81611
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Sep 2017 19:02
Last Modified:03 Oct 2019 18:44

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