Far-infrared and submillimeter-wavelength observations of star-forming dense cores. I - Spectra

E. F. Ladd, Fred C. Adams, S. Casey, J. A. Davidson, G. A. Fuller, D. A. Harper, P. C. Myers, R. Padman

Research output: Contribution to journalArticle

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Abstract

Far-infrared and submillimeter photometry of 10 low-mass star formation regions containing embedded IRAS sources is presented. These new observations define the peak of the spectral energy distributions of these objects and provide more precise estimates of their bolometric luminosities. Two new sources, L1527 and L483, are among the reddest known low-mass objects, with spectral energy distribution peaks at 100-200 microns and extremely steep IRAS slopes. These cold sources have spectra which are similar to blackbodies of 30-40 K but have significant excess emission on the Wien side. Models of the spectral energy distributions using a spherically symmetric core structure indicate that these sources have visual extinctions greater than 1000 mag. However, models with these large extinctions predict too little near-infrared emission. A nonspherically symmetric distribution of circumstellar material may play a role in the generation of the extra near-infrared emission.
Original languageEnglish
Pages (from-to)203-220
JournalThe Astrophysical Journal
Volume366
DOIs
Publication statusPublished - 1 Jan 1991

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wavelength
stars
Infrared Astronomy Satellite
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extinction
wavelengths
infrared photometry
energy
photometry
slopes
distribution
estimates
cold

Cite this

Ladd, E. F. ; Adams, Fred C. ; Casey, S. ; Davidson, J. A. ; Fuller, G. A. ; Harper, D. A. ; Myers, P. C. ; Padman, R. / Far-infrared and submillimeter-wavelength observations of star-forming dense cores. I - Spectra. In: The Astrophysical Journal. 1991 ; Vol. 366. pp. 203-220.
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title = "Far-infrared and submillimeter-wavelength observations of star-forming dense cores. I - Spectra",
abstract = "Far-infrared and submillimeter photometry of 10 low-mass star formation regions containing embedded IRAS sources is presented. These new observations define the peak of the spectral energy distributions of these objects and provide more precise estimates of their bolometric luminosities. Two new sources, L1527 and L483, are among the reddest known low-mass objects, with spectral energy distribution peaks at 100-200 microns and extremely steep IRAS slopes. These cold sources have spectra which are similar to blackbodies of 30-40 K but have significant excess emission on the Wien side. Models of the spectral energy distributions using a spherically symmetric core structure indicate that these sources have visual extinctions greater than 1000 mag. However, models with these large extinctions predict too little near-infrared emission. A nonspherically symmetric distribution of circumstellar material may play a role in the generation of the extra near-infrared emission.",
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author = "Ladd, {E. F.} and Adams, {Fred C.} and S. Casey and Davidson, {J. A.} and Fuller, {G. A.} and Harper, {D. A.} and Myers, {P. C.} and R. Padman",
year = "1991",
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Ladd, EF, Adams, FC, Casey, S, Davidson, JA, Fuller, GA, Harper, DA, Myers, PC & Padman, R 1991, 'Far-infrared and submillimeter-wavelength observations of star-forming dense cores. I - Spectra' The Astrophysical Journal, vol. 366, pp. 203-220. https://doi.org/10.1086/169553

Far-infrared and submillimeter-wavelength observations of star-forming dense cores. I - Spectra. / Ladd, E. F.; Adams, Fred C.; Casey, S.; Davidson, J. A.; Fuller, G. A.; Harper, D. A.; Myers, P. C.; Padman, R.

In: The Astrophysical Journal, Vol. 366, 01.01.1991, p. 203-220.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Far-infrared and submillimeter-wavelength observations of star-forming dense cores. I - Spectra

AU - Ladd, E. F.

AU - Adams, Fred C.

AU - Casey, S.

AU - Davidson, J. A.

AU - Fuller, G. A.

AU - Harper, D. A.

AU - Myers, P. C.

AU - Padman, R.

PY - 1991/1/1

Y1 - 1991/1/1

N2 - Far-infrared and submillimeter photometry of 10 low-mass star formation regions containing embedded IRAS sources is presented. These new observations define the peak of the spectral energy distributions of these objects and provide more precise estimates of their bolometric luminosities. Two new sources, L1527 and L483, are among the reddest known low-mass objects, with spectral energy distribution peaks at 100-200 microns and extremely steep IRAS slopes. These cold sources have spectra which are similar to blackbodies of 30-40 K but have significant excess emission on the Wien side. Models of the spectral energy distributions using a spherically symmetric core structure indicate that these sources have visual extinctions greater than 1000 mag. However, models with these large extinctions predict too little near-infrared emission. A nonspherically symmetric distribution of circumstellar material may play a role in the generation of the extra near-infrared emission.

AB - Far-infrared and submillimeter photometry of 10 low-mass star formation regions containing embedded IRAS sources is presented. These new observations define the peak of the spectral energy distributions of these objects and provide more precise estimates of their bolometric luminosities. Two new sources, L1527 and L483, are among the reddest known low-mass objects, with spectral energy distribution peaks at 100-200 microns and extremely steep IRAS slopes. These cold sources have spectra which are similar to blackbodies of 30-40 K but have significant excess emission on the Wien side. Models of the spectral energy distributions using a spherically symmetric core structure indicate that these sources have visual extinctions greater than 1000 mag. However, models with these large extinctions predict too little near-infrared emission. A nonspherically symmetric distribution of circumstellar material may play a role in the generation of the extra near-infrared emission.

KW - Far Infrared Radiation

KW - Star Formation

KW - Stellar Cores

KW - Stellar Spectrophotometry

KW - Submillimeter Waves

KW - Astronomical Models

KW - Infrared Astronomy Satellite

KW - Spectral Energy Distribution

KW - Stellar Envelopes

KW - Stellar Luminosity

KW - Stellar Structure

U2 - 10.1086/169553

DO - 10.1086/169553

M3 - Article

VL - 366

SP - 203

EP - 220

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

ER -