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J/ApJ/697/787 The NAN complex. I. IRAC observations (Guieu+, 2009)
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Beginning of ReadMe :J/ApJ/697/787 The NAN complex. I. IRAC observations (Guieu+, 2009)
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The North American and Pelican nebulae.
I. IRAC observations.
Guieu S., Rebull L.M., Stauffer J.R., Hillenbrand L.A., Carpenter J.M.,
Noriega-Crespo A., Padgett D.L., Cole D.M., Carey S.J., Stapelfeldt K.R.,
Strom S.E.
<Astrophys. J., 697, 787-800 (2009)>
=2009ApJ...697..787G
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ADC_Keywords: YSOs ; Photometry, infrared ; Nebulae ; Photometry, VRI
Keywords: circumstellar matter - infrared: ISM - infrared: stars - ISM: clouds -
ISM: individual (NGC 7000, IC 5070) - stars: formation -
stars: pre-main sequence
Abstract:
We present a 9deg^2^ map of the North American and Pelican Nebulae
regions obtained in all four Infrared Array Camera (IRAC) channels
with the Spitzer Space Telescope. The resulting photometry is merged
with that at JHKs from Two Micron All Sky Survey and a more spatially
limited BVI survey from previous ground-based work. We use a mixture
of color-color diagrams to select a minimally contaminated set of more
than 1600 objects that we claim are young stellar objects (YSOs)
associated with the star-forming region. Because our selection
technique uses infrared excess as a requirement, our sample is
strongly biased against inclusion of Class III YSOs. The distribution
of IRAC spectral slopes for our YSOs indicates that most of these
objects are Class II, with a peak toward steeper spectral slopes but a
substantial contribution from a tail of Flat spectrum and Class I type
objects. By studying the small fraction of the sample that is
optically visible, we infer a typical age of a few Myr for the
low-mass population. The young stars are clustered, with about a third
of them located in eight clusters that are located within or near the
LDN 935 dark cloud. Half of the YSOs are located in regions with
surface densities higher than 1000YSOs/deg^2^. The Class I objects are
more clustered than the Class II stars.
Description:
The Spitzer/IRAC observations of the NAN (The North American (NGC 7000)
and Pelican (IC 5070) Nebulae) complex were obtained as part of the
Cycle-2 program 20015 (PI: L. Rebull) in 2006 August 9-11. Additional
observations of the "corners" of the map were obtained as part of
program 462 in 2007 November 15-27.
BVI images were obtained with the KPNO 0.9m telescope on four
photometric nights in 1997 June.
Astrometry was obtained using the Hubble Space Telescope Guide Star
Catalog and the TASTROM task and is estimated accurate to <0.3"
(1sigma) based on stars in the overlap regions.