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J/AJ/144/192 Spitzer survey of Orion A and B. I. An YSO catalog (Megeath+, 2012)
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Beginning of ReadMe :J/AJ/144/192 Spitzer survey of Orion A and B. I. YSO catalog (Megeath+, 2012)
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The Spitzer Space Telescope survey of the Orion A and B molecular clouds.
I. A census of dusty young stellar objects and a study of their mid-infrared
variability.
Megeath S.T., Gutermuth R., Muzerolle J., Kryukova E., Flaherty K.,
Hora J.L., Allen L.E., Hartmann L., Myers P.C., Pipher J.L., Stauffer J.,
Young E.T., Fazio G.G.
<Astron. J., 144, 192 (2012)>
=2012AJ....144..192M
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ADC_Keywords: Molecular clouds ; YSOs ; Photometry, infrared ;
Stars, pre-main sequence
Keywords: infrared: stars - ISM: individual (Orion A,Orion B) -
stars: formation - stars: variables: T Tauri - Herbig Ae/Be
Abstract:
We present a survey of the Orion A and B molecular clouds undertaken
with the IRAC and MIPS instruments on board Spitzer. In total, five
distinct fields were mapped, covering 9deg^2^ in five mid-IR bands
spanning 3-24mum. The survey includes the Orion Nebula Cluster, the
Lynds 1641, 1630, and 1622 dark clouds, and the NGC 2023, 2024, 2068,
and 2071 nebulae. These data are merged with the Two Micron All Sky
Survey point source catalog to generate a catalog of eight-band
photometry. We identify 3479 dusty young stellar objects (YSOs) in the
Orion molecular clouds by searching for point sources with mid-IR
colors indicative of reprocessed light from dusty disks or infalling
envelopes. The YSOs are subsequently classified on the basis of their
mid-IR colors and their spatial distributions are presented. We
classify 2991 of the YSOs as pre-main-sequence stars with disks and
488 as likely protostars. Most of the sources were observed with IRAC
in two to three epochs over six months; we search for variability
between the epochs by looking for correlated variability in the 3.6
and 4.5mum bands. We find that 50% of the dusty YSOs show
variability. The variations are typically small ( 0.2mag) with the
protostars showing a higher incidence of variability and larger
variations. The observed correlations between the 3.6, 4.5, 5.8, and
8mum variability suggests that we are observing variations in the
heating of the inner disk due to changes in the accretion luminosity
or rotating accretion hot spots.
Description:
Our Young Stellar Objects (YSOs) in the Orion A and B clouds were
identified using the IRAC and MIPS instruments on board the Spitzer
Space Telescope and the 2MASS point source catalog (cat. II/246). The
IRAC observations were taken as part of Guaranteed Time Observation
(GTO) programs and are summarized below (see table 1 in the paper for
a complete summary):
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Field Name | 1st epoch of | 2nd epoch of |PID
| observation | observation |
----------------------------------------------------
ONC |2004 Mar 9 |2004 Oct 12 |43
L1641 |2004 Feb 16-18|2004 Oct 8, 27|43
Ori A ext. |2007 Oct 21 |2008 Apr 9-10 |30641
kappa Ori ext.|2009 Mar 21-22| |50070
ONC center |2004 Oct 27 | |50
NGC 2024/23 |2004 Feb 17 |2004 Oct 27 |43
NGC 2024 |2004 Oct 8 | |50
NGC 2024 ext. |2007 Mar 30 |2007 Oct 16 |30641
NGC 2068/71 |2004 Mar 7 |2004 Oct 28 |43
L1622 |2005 Oct 27 |2006 Mar 25 |43
Ori B fil. |2007 Mar 29-30|2007 Oct 16-17|30641
Reference 1 |2005 Oct 26-29| |43
Reference 2 |2007 Oct 16 | |30641
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The MIPS observations (obtained from GTO programs) are summarized
below (see table 2 in the paper for a complete summary):
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Field name | Epoch of | PID
| observation |
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ONC |2004 Mar 20 | 58
ONC Ext. |2008 Apr 19 |30641
L1641 |2005 Apr 2 | 47
kappa Ori|2008 Nov 26-27|50070
NGC 2024/23|2005 Apr 3 | 47
NGC 2068/27|2004 Mar 15 | 58
L1622 |2005 Nov 4 | 43
Ori B fil. |2008 Apr 16 |30641
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