J/ApJS/236/27 APOGEE-2 survey of Orion Complex (OSFC). I. (Cottle+, 2018)
The APOGEE-2 Survey of the Orion Star-forming Complex.
I. Target selection and validation with early observations.
Cottle J., Covey K.R., Suarez G., Roman-Zuniga C., Schlafly E.,
Downes J.J., Ybarra J.E., Hernandez J., Stassun K., Stringfellow G.S.,
Getman K., Feigelson E., Borissova J., Kim J.S., Roman-Lopes A., Da Rio N.,
De Lee N., Frinchaboy P.M., Kounkel M., Majewski S.R., Mennickent R.E.,
Nidever D.L., Nitschelm C., Pan K., Shetrone M., Zasowski G., Chambers K.,
Magnier E., Valenti J.
<Astrophys. J. Suppl. Ser., 236, 27 (2018)>
=2018ApJS..236...27C 2018ApJS..236...27C
ADC_Keywords: Molecular clouds; Photometry, infrared; Photometry, ugriz; YSOs;
Surveys
Keywords: open clusters and associations: individual (Orion); stars: formation;
stars : pre-main sequence; stars: protostars; surveys
Abstract:
The Orion Star-forming Complex (OSFC) is a central target for the
APOGEE-2 Young Cluster Survey. Existing membership catalogs span
limited portions of the OSFC, reflecting the difficulty of selecting
targets homogeneously across this extended, highly structured region.
We have used data from wide-field photometric surveys to produce a
less biased parent sample of young stellar objects (YSOs) with
infrared (IR) excesses indicative of warm circumstellar material or
photometric variability at optical wavelengths across the full 420deg2
extent of the OSFC. When restricted to YSO candidates with H<12.4, to
ensure S/N∼100 for a six-visit source, this uniformly selected sample
includes 1307 IR excess sources selected using criteria vetted by
Koenig & Leisawitz (2014ApJ...791..131K 2014ApJ...791..131K) and 990 optical variables
identified in the Pan-STARRS1 3π survey: 319 sources exhibit both
optical variability and evidence of circumstellar disks through IR
excess. Objects from this uniformly selected sample received the
highest priority for targeting, but required fewer than half of the
fibers on each APOGEE-2 plate. We filled the remaining fibers with
previously confirmed and new color-magnitude selected candidate OSFC
members. Radial velocity measurements from APOGEE-1 and new APOGEE-2
observations taken in the survey's first year indicate that ∼90% of
the uniformly selected targets have radial velocities consistent with
Orion membership. The APOGEE-2 Orion survey will include >1100 bona
fide YSOs whose uniform selection function will provide a robust
sample for comparative analyses of the stellar populations and
properties across all sub-regions of Orion.
Description:
Observations for the APOGEE-2 Young Cluster Survey are collected with
the APOGEE-2 northern spectrograph (APOGEE-2N) on the 2.5m SDSS
telescope at the Apache Point Observatory.
The Orion Star-forming Complex (OSFC) is the largest region targeted
in the APOGEE-2 Young Cluster Survey. The complete 16 field plan for
the APOGEE-2 Orion Survey is shown schematically in Figure 1.
The first APOGEE-2 observations in Orion were conducted in 2016
January and February. Additional observations, comprising the bulk of
the planned surveys for the λ Ori, Orion B, and Orion OB1ab
fields, were completed during the 2016-2017 observing season. We list
the Julian dates of all observations acquired for APOGEE-2 Orion
fields through the summer of 2017 in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 39 62 Fields in APOGEE-2 Orion Survey
table5.dat 116 1307 *Koenig selected YSO candidates
table6.dat 145 991 Optical variables in the Orion Star-forming
Complex (OSFC)
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Note on table5.dat: Table 5 presents the full catalog of YSO candidates
selected on the basis of infrared excesses indicative of circumstellar disks;
criteria vetted by Koenig & Liesawitz (2014ApJ...791..131K 2014ApJ...791..131K).
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
II/328 : AllWISE Data Release (Cutri+ 2013)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
J/AJ/121/2124 : λ Ori pre-main-sequence stars photometry (Dolan+, 2001)
J/AJ/123/387 : VRI photom. of λ Ori star-forming region (Dolan+, 2002)
J/AJ/129/907 : New Ori OB1 members (Briceno+, 2005)
J/A+A/440/403 : 109 new Galactic open clusters (Kharchenko+, 2005)
J/ApJ/664/481 : Opt/IR photometry of Collinder 69 (Barrado y Navascues+ 2007)
J/ApJ/661/1119 : Spectroscopy in the 25 Ori group (Briceno+, 2007)
J/A+A/461/183 : Variability of classical T Tauri (Grankin+, 2007)
J/ApJ/662/1067 : Sptizer observations of sigma Orionis (Hernandez+, 2007)
J/A+A/485/155 : HK photometry of rho Oph PMS stars (Alves de Oliveira+, 2008)
J/A+A/478/667 : The Mayrit catalogue (Caballero, 2008)
J/A+A/479/827 : UBVR light curves of weak-line T Tauri stars (Grankin+, 2008)
J/ApJ/674/336 : Spitzer observations of NGC 1333 (Gutermuth+, 2008)
J/ApJ/697/1103 : Kinematics of Orion Nebula Cluster (Tobin+, 2009)
J/ApJ/722/1226 : IR photometry in λ Orionis cluster (Hernandez+, 2010)
J/A+A/526/A21 : Collinder 69 X-ray sources (Barrado+, 2011)
J/A+A/530/A150 : XMM observations of λ Ori cluster (Franciosini+, 2011)
J/A+A/536/A63 : Collinder 69 very low mass stars & brown dwarfs (Bayo+, 2011)
J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
J/A+A/547/A80 : Properties of Collinder 69 low-mass members (Bayo+, 2012)
J/ApJS/209/32 : Probable young stars in the MYStIX project (Broos+, 2013)
J/ApJS/207/5 : YSOs in LDN 1641 with Hectochelle spectra (Fang+, 2013)
J/ApJ/768/99 : X-ray survey of YSOs in Orion A (Pillitteri+, 2013)
J/A+A/564/A29 : Optical and near-infrared photometry in Orion A (Bouy+, 2014)
J/ApJ/794/125 : IN-SYNC. I. APOGEE stellar parameters (Cottaar+, 2014)
J/MNRAS/440/3430 : SDSS-2MASS-WISE stellar colour locus (Davenport+, 2014)
J/MNRAS/444/1793 : 25 Ori group low-mass stars (Downes+, 2014)
J/ApJ/784/126 : IR photometry of all known members in Taurus (Esplin+, 2014)
J/ApJ/787/109 : Age estimates for NGC 2024 and ONC stars (Getman+, 2014)
J/ApJ/794/36 : σ Orionis cluster stellar population (Hernandez+, 2014)
J/A+A/563/A94 : Kinematics of the Gamma Vel cluster (Jeffries+, 2014)
J/ApJ/807/27 : IN-SYNC. III. RVs of IC348 stars (Cottaar+, 2015)
J/ApJ/799/136 : IN-SYNC. II. Candidate young stars in NGC 1333 (Foster+, 2015)
J/AJ/150/100 : WISE YSO cand. near σ and λ Ori (Koenig+, 2015)
J/AJ/150/132 : JHK photometry of 1203 variables in ONC (Rice+, 2015)
J/AJ/150/32 : KELT 2006-2013 photom. of V409 Tau & AA Tau (Rodriguez+, 2015)
J/A+A/574/L7 : Gaia-ESO Survey: Li-rich stars in NGC2547 (Sacco+, 2015)
J/ApJ/822/81 : PTF stellar rotation per. for Pleiades members (Covey+, 2016)
J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016)
J/AJ/151/144 : ASPCAP weights for 15 APOGEE chemical elements (Garcia+, 2016)
J/AJ/154/14 : Low-mass stars in 25 Ori group and Orion OB1a (Suarez+, 2017)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Field Field name
14- 19 F6.3 deg RAdeg [80.69/86.66] Right ascension (J2000)
21- 26 F6.3 deg DEdeg [-8.7/11.8] Declination (J2000)
28- 31 I4 --- Plate [8879/9661]? SDSS plate number
33- 39 I7 --- Epoch [2457406/2457796]? Julian date of observation
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 10 F10.7 deg RAdeg [75/90] Right Ascension (J2000)
12- 22 F11.7 deg DEdeg [-12.4/14] Declination (J2000)
24- 29 F6.3 mag W1mag [6.4/12.2] WISE 3.4um (W1) band magnitude
31- 35 F5.3 mag e_W1mag [0.02/0.2] The 1σ uncertainty in W1mag
37- 42 F6.3 mag W2mag [5.3/11.8] WISE 4.6um (W2) band magnitude
44- 48 F5.3 mag e_W2mag [0.01/0.2] The 1σ uncertainty in W2mag
50- 55 F6.3 mag W3mag [-4.5/11] WISE 12um (W3) band magnitude
57- 61 F5.3 mag e_W3mag [0/0.6] The 1σ uncertainty in W3mag
63- 68 F6.3 mag W4mag [-3.1/9.2] WISE 22um (W4) band magnitude
70- 74 F5.3 mag e_W4mag [0/0.6] The 1σ uncertainty in W4mag
76- 81 F6.3 mag Jmag [8.6/15.6] 2MASS J band magnitude
83- 87 F5.3 mag e_Jmag [0/0.09] The 1σ uncertainty in Jmag
89- 94 F6.3 mag Hmag [7.9/12.4] 2MASS H band magnitude
96-100 F5.3 mag e_Hmag [0/0.08] The 1σ uncertainty in Hmag
102-107 F6.3 mag Ksmag [7.1/12.2] 2MASS Ks band magnitude
109-113 F5.3 mag e_Ksmag [0/0.08] The 1σ uncertainty in Ksmag
115-116 A2 --- Class Koenig & Leisawitz 2014ApJ...791..131K 2014ApJ...791..131K
YSO classification (Class "I": 40 sources;
or "II": 1267 sources)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.6 deg RAdeg [75/90] Right Ascension (J2000)
11- 20 F10.6 deg DEdeg [-12.5/15] Declination (J2000)
22 I1 --- Nv [3/5] Number of bands flagged as variable
24- 28 F5.2 --- zetag [-2.4/2.5] g band variability metric (1)
30- 37 E8.2 Jy sigg [3.7e-07/0.003] Standard deviation of
g band fluxes
39- 46 E8.2 Jy errg [3.3e-07/9.3e-05] Expected error per epoch
in g band flux
48- 52 F5.2 --- zetar [-1.8/2.1] r band variability metric (1)
54- 61 E8.2 Jy sigr [4.9e-07/0.005] Standard deviation of
r band fluxes
63- 70 E8.2 Jy errr [2.8e-07/0.0002] Expected error per epoch
in r band flux
72- 76 F5.2 --- zetai [-2.8/2.5] i band variability metric (1)
78- 85 E8.2 Jy sigi [3.7e-07/0.006] Standard deviation of
i band fluxes
87- 94 E8.2 Jy erri [3.7e-07/0.0003] Expected error per epoch
in i band flux
96-100 F5.2 --- zetaz [-1.7/2] z band variability metric (1)
102-109 E8.2 Jy sigz [7.9e-06/0.009] Standard deviation of
z band fluxes
111-118 E8.2 Jy errz [1.5e-06/0.0002] Expected error per epoch
in z band flux
120-124 F5.2 --- zetay [-1.3/1.7] y band variability metric (1)
126-133 E8.2 Jy sigy [1.3e-05/0.01] Standard deviation of
y band fluxes
135-142 E8.2 Jy erry [3.8e-06/0.0002] Expected error per epoch
in y band flux
144-145 I2 --- Nobs [16/70] Number of observations used
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Note (1): Where zeta=log(sigf/(errf*Nobs0.5)), where f is a
given wavelength band (i.e, g, r, i, z or y); see Section 3.2.
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History:
From electronic version of the journal
References:
Kounkel et al. Paper II. 2018AJ....156...84K 2018AJ....156...84K
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Aug-2018