The Frequency of Mid‐Infrared Excess Sources in Galactic Surveys | Zendy

B. Uzpen | Zendy; Henry A. Kobulnicky | Zendy; Andy Monson | Zendy; Michael Pierce | Zendy; D. P. Clemens | Zendy; D. E. Backman | Zendy; M. R. Meade | Zendy; B. Babler | Zendy; R. Indebetouw | Zendy; B. A. Whitney | Zendy; C. Watson | Zendy; M. G. Wolfire | Zendy; Robert A. Benjamin | Zendy; S. Bracker | Zendy; T. M. Bania | Zendy; Martin Cohen | Zendy; C. J. Cyganowski | Zendy; K. E. Devine | Zendy; Fabian Heitsch | Zendy; J. M. Jackson | Zendy; J. S. Mathis | Zendy; E. P. Mercer | Zendy; Matthew S. Povich | Zendy; Jeonghee Rho | Zendy; Thomas Robitaille | Zendy; M. Sewiło | Zendy; S. Stolovy | Zendy; Douglas F. Watson | Zendy; M. J. Wolff | Zendy; E. Churchwell | Zendy

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The Frequency of Mid‐Infrared Excess Sources in Galactic Surveys

Author(s) -

B. Uzpen,

Henry A. Kobulnicky,

Andy Monson,

Michael Pierce,

D. P. Clemens,

D. E. Backman,

M. R. Meade,

B. Babler,

R. Indebetouw,

B. A. Whitney,

C. Watson,

M. G. Wolfire,

Robert A. Benjamin,

S. Bracker,

T. M. Bania,

Martin Cohen,

C. J. Cyganowski,

K. E. Devine,

Fabian Heitsch,

J. M. Jackson,

J. S. Mathis,

E. P. Mercer,

Matthew S. Povich,

Jeonghee Rho,

Thomas Robitaille,

M. Sewiło,

S. Stolovy,

Douglas F. Watson,

M. J. Wolff,

E. Churchwell

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/511736

Subject(s) - physics , stars , astrophysics , infrared , stellar classification , bremsstrahlung , main sequence , infrared excess , spectral line , astronomy , photon , quantum mechanics

We have identified 230 Tycho-2 Spectral Catalog stars that exhibit 8 micronmid-infrared extraphotospheric excesses in the MidCourse Space Experiment (MSX)and Spitzer Space Telescope Galactic Legacy MidPlane Survey Extraordinaire(GLIMPSE) surveys. Of these, 183 are either OB stars earlier than B8 in whichthe excess plausibly arises from a thermal bremsstrahlung component or evolvedstars in which the excess may be explained by an atmospheric dust component.The remaining 47 stars have spectral classifications B8 or later and appear tobe main sequence or late pre-main-sequence objects harboring circumstellardisks. Six of the 47 stars exhibit multiple signatures characteristic ofpre-main-sequence circumstellar disks, including emission lines, near-infraredK-band excesses, and X-ray emission. Approximately one-third of the remaining41 sources have emission lines suggesting relative youth. Of the 25 GLIMPSEstars with SST data at >24 microns, 20 also show an excess at 24 microns. Threeadditional objects have 24 micron upper limits consistent with possibleexcesses, and two objects have photospheric measurements at 24 microns. Six MSXsources had a measurement at wavelengths >8 microns. We modeled the excesses in26 stars having two or more measurements in excess of the expected photospheresas single-component blackbodies. We determine probable disk temperatures andfractional infrared luminosities in the range 191 < T < 787 and 3.9x10^-4

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