IRAC observations of taurus pre-main-sequence stars

Lee Hartmann, S. T. Megeath, Lori Allen, Kevin Luhman, Nuria Calvet, Paola D'Alessio, Ramiro Franco-Hernandez, Giovanni Fazio

Research output: Contribution to journalArticle

218 Citations (Scopus)

Abstract

We present infrared photometry obtained with the IRAC camera on the Spitzer Space Telescope of a sample of 82 pre-main-sequence stars and brown dwarfs in the Taurus star-forming region. We find a clear separation in some IRAC color-color diagrams between objects with and without disks. A few "transition" objects are noted, which correspond to systems in which the inner disk has been evacuated of small dust. Separating pure disk systems from objects with remnant protostellar envelopes is more difficult at IRAC wavelengths, especially for objects with infall at low rates and large angular momenta. Our results generally confirm the IRAC color classification scheme used in previous papers by Allen et al. and Megeath et al. to distinguish between protostars, T Tauri stars with disks, and young stars without (inner) disks. The observed IRAC colors are in good agreement with recent improved disk models, and in general accord with models for protostellar envelopes derived from analyzing a larger wavelength region. We also comment on a few Taurus objects of special interest. Our results should be useful for interpreting IRAC results in other, less well studied star-forming regions.

Original languageEnglish (US)
Pages (from-to)881-896
Number of pages16
JournalAstrophysical Journal
Volume629
Issue number2 I
DOIs
StatePublished - Aug 20 2005

Fingerprint

pre-main sequence stars
wavelength
stars
envelopes
angular momentum
color-color diagram
color
infrared photometry
Space Infrared Telescope Facility
T Tauri stars
protostars
diagram
dust
wavelengths
cameras

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hartmann, L., Megeath, S. T., Allen, L., Luhman, K., Calvet, N., D'Alessio, P., ... Fazio, G. (2005). IRAC observations of taurus pre-main-sequence stars. Astrophysical Journal, 629(2 I), 881-896. https://doi.org/10.1086/431472
Hartmann, Lee ; Megeath, S. T. ; Allen, Lori ; Luhman, Kevin ; Calvet, Nuria ; D'Alessio, Paola ; Franco-Hernandez, Ramiro ; Fazio, Giovanni. / IRAC observations of taurus pre-main-sequence stars. In: Astrophysical Journal. 2005 ; Vol. 629, No. 2 I. pp. 881-896.
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Hartmann, L, Megeath, ST, Allen, L, Luhman, K, Calvet, N, D'Alessio, P, Franco-Hernandez, R & Fazio, G 2005, 'IRAC observations of taurus pre-main-sequence stars', Astrophysical Journal, vol. 629, no. 2 I, pp. 881-896. https://doi.org/10.1086/431472

IRAC observations of taurus pre-main-sequence stars. / Hartmann, Lee; Megeath, S. T.; Allen, Lori; Luhman, Kevin; Calvet, Nuria; D'Alessio, Paola; Franco-Hernandez, Ramiro; Fazio, Giovanni.

In: Astrophysical Journal, Vol. 629, No. 2 I, 20.08.2005, p. 881-896.

Research output: Contribution to journalArticle

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AU - Hartmann, Lee

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AU - Allen, Lori

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AU - Calvet, Nuria

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AU - Franco-Hernandez, Ramiro

AU - Fazio, Giovanni

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N2 - We present infrared photometry obtained with the IRAC camera on the Spitzer Space Telescope of a sample of 82 pre-main-sequence stars and brown dwarfs in the Taurus star-forming region. We find a clear separation in some IRAC color-color diagrams between objects with and without disks. A few "transition" objects are noted, which correspond to systems in which the inner disk has been evacuated of small dust. Separating pure disk systems from objects with remnant protostellar envelopes is more difficult at IRAC wavelengths, especially for objects with infall at low rates and large angular momenta. Our results generally confirm the IRAC color classification scheme used in previous papers by Allen et al. and Megeath et al. to distinguish between protostars, T Tauri stars with disks, and young stars without (inner) disks. The observed IRAC colors are in good agreement with recent improved disk models, and in general accord with models for protostellar envelopes derived from analyzing a larger wavelength region. We also comment on a few Taurus objects of special interest. Our results should be useful for interpreting IRAC results in other, less well studied star-forming regions.

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Hartmann L, Megeath ST, Allen L, Luhman K, Calvet N, D'Alessio P et al. IRAC observations of taurus pre-main-sequence stars. Astrophysical Journal. 2005 Aug 20;629(2 I):881-896. https://doi.org/10.1086/431472