Spitzer 24 μm excesses for bright galactic stars in botes and first look survey fields

L. R. Hovhannisyan, A. M. Mickaelian, D. W. Weedman, E. Le Floc'H, J. R. Houck, B. T. Soifer, K. Brand, A. Dey, Buell Tomasson Jannuzi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Optically bright Galactic stars (V ≲ 13 mag) having f ν(24 μm) > 1 mJy are identified in Spitzer mid-infrared surveys within 8.2 deg2 for the Boötes field of the NOAO Deep Wide-Field Survey and within 5.5 deg2 for the First Look Survey (FLS). One hundred and twenty-eight stars are identified in Boötes and 140 in the FLS, and their photometry is given. (K - [24]) colors are determined using K magnitudes from the Two Micron All Sky Survey for all stars in order to search for excess 24 μm luminosity compared to that arising from the stellar photosphere. Of the combined sample of 268 stars, 141 are of spectral types F, G, or K, and 17 of these 141 stars have 24 μm excesses with (K - [24]) > 0.2 mag. Using limits on absolute magnitude derived from proper motions, at least eight of the FGK stars with excesses are main-sequence stars, and estimates derived from the distribution of apparent magnitudes indicate that all 17 are main-sequence stars. These estimates lead to the conclusion that between 9% and 17% of the main-sequence FGK field stars in these samples have 24 μm infrared excesses. This result is statistically similar to the fraction of stars with debris disks found among previous Spitzer targeted observations of much brighter, main-sequence field stars.

Original languageEnglish (US)
Pages (from-to)251-261
Number of pages11
JournalAstronomical Journal
Volume138
Issue number1
DOIs
StatePublished - 2009
Externally publishedYes

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field survey
stars
star distribution
main sequence stars
proper motion
photosphere
estimates
debris
photometry
luminosity
color

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Hovhannisyan, L. R., Mickaelian, A. M., Weedman, D. W., Le Floc'H, E., Houck, J. R., Soifer, B. T., ... Jannuzi, B. T. (2009). Spitzer 24 μm excesses for bright galactic stars in botes and first look survey fields. Astronomical Journal, 138(1), 251-261. https://doi.org/10.1088/0004-6256/138/1/251

Spitzer 24 μm excesses for bright galactic stars in botes and first look survey fields. / Hovhannisyan, L. R.; Mickaelian, A. M.; Weedman, D. W.; Le Floc'H, E.; Houck, J. R.; Soifer, B. T.; Brand, K.; Dey, A.; Jannuzi, Buell Tomasson.

In: Astronomical Journal, Vol. 138, No. 1, 2009, p. 251-261.

Research output: Contribution to journalArticle

Hovhannisyan, LR, Mickaelian, AM, Weedman, DW, Le Floc'H, E, Houck, JR, Soifer, BT, Brand, K, Dey, A & Jannuzi, BT 2009, 'Spitzer 24 μm excesses for bright galactic stars in botes and first look survey fields', Astronomical Journal, vol. 138, no. 1, pp. 251-261. https://doi.org/10.1088/0004-6256/138/1/251
Hovhannisyan LR, Mickaelian AM, Weedman DW, Le Floc'H E, Houck JR, Soifer BT et al. Spitzer 24 μm excesses for bright galactic stars in botes and first look survey fields. Astronomical Journal. 2009;138(1):251-261. https://doi.org/10.1088/0004-6256/138/1/251
Hovhannisyan, L. R. ; Mickaelian, A. M. ; Weedman, D. W. ; Le Floc'H, E. ; Houck, J. R. ; Soifer, B. T. ; Brand, K. ; Dey, A. ; Jannuzi, Buell Tomasson. / Spitzer 24 μm excesses for bright galactic stars in botes and first look survey fields. In: Astronomical Journal. 2009 ; Vol. 138, No. 1. pp. 251-261.
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abstract = "Optically bright Galactic stars (V ≲ 13 mag) having f ν(24 μm) > 1 mJy are identified in Spitzer mid-infrared surveys within 8.2 deg2 for the Bo{\"o}tes field of the NOAO Deep Wide-Field Survey and within 5.5 deg2 for the First Look Survey (FLS). One hundred and twenty-eight stars are identified in Bo{\"o}tes and 140 in the FLS, and their photometry is given. (K - [24]) colors are determined using K magnitudes from the Two Micron All Sky Survey for all stars in order to search for excess 24 μm luminosity compared to that arising from the stellar photosphere. Of the combined sample of 268 stars, 141 are of spectral types F, G, or K, and 17 of these 141 stars have 24 μm excesses with (K - [24]) > 0.2 mag. Using limits on absolute magnitude derived from proper motions, at least eight of the FGK stars with excesses are main-sequence stars, and estimates derived from the distribution of apparent magnitudes indicate that all 17 are main-sequence stars. These estimates lead to the conclusion that between 9{\%} and 17{\%} of the main-sequence FGK field stars in these samples have 24 μm infrared excesses. This result is statistically similar to the fraction of stars with debris disks found among previous Spitzer targeted observations of much brighter, main-sequence field stars.",
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AU - Le Floc'H, E.

AU - Houck, J. R.

AU - Soifer, B. T.

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AU - Jannuzi, Buell Tomasson

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AB - Optically bright Galactic stars (V ≲ 13 mag) having f ν(24 μm) > 1 mJy are identified in Spitzer mid-infrared surveys within 8.2 deg2 for the Boötes field of the NOAO Deep Wide-Field Survey and within 5.5 deg2 for the First Look Survey (FLS). One hundred and twenty-eight stars are identified in Boötes and 140 in the FLS, and their photometry is given. (K - [24]) colors are determined using K magnitudes from the Two Micron All Sky Survey for all stars in order to search for excess 24 μm luminosity compared to that arising from the stellar photosphere. Of the combined sample of 268 stars, 141 are of spectral types F, G, or K, and 17 of these 141 stars have 24 μm excesses with (K - [24]) > 0.2 mag. Using limits on absolute magnitude derived from proper motions, at least eight of the FGK stars with excesses are main-sequence stars, and estimates derived from the distribution of apparent magnitudes indicate that all 17 are main-sequence stars. These estimates lead to the conclusion that between 9% and 17% of the main-sequence FGK field stars in these samples have 24 μm infrared excesses. This result is statistically similar to the fraction of stars with debris disks found among previous Spitzer targeted observations of much brighter, main-sequence field stars.

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