J/ApJ/883/6 AllWISE & NEOWISE LCs of Red MSX massive YSOs (Uchiyama+, 2019)
WISE discovery of mid-infrared variability in massive young stellar objects.
Uchiyama M., Ichikawa K.
<Astrophys. J., 883, 6 (2019)>
=2019ApJ...883....6U 2019ApJ...883....6U
ADC_Keywords: YSOs; Photometry, infrared
Keywords: stars: formation ; stars: massive ; stars: variables: general
Abstract:
We systematically investigate the mid-infrared (MIR; λ>3µm)
time variability of uniformly selected ∼800 massive young stellar
objects (MYSOs) from the Red Midcourse Space Experiment Source survey.
Out of the 806 sources, we obtain reliable 9yr long MIR magnitude
variability data of 331 sources at the 3.4µm (W1) and 4.6µm (W2)
bands by cross-matching the MYSO positions with ALLWISE and NEOWISE
catalogs. After applying the variability selections using ALLWISE
data, we identify five MIR-variable candidates. The light curves show
various classes, with the periodic, plateau-like, and dipper features.
Out of the obtained two color-magnitude diagram of W1 and W1-W2, one
shows "bluer when brighter and redder when fainter" trends in
variability, suggesting change in extinction or accretion rate.
Finally, our results show that G335.9960-00.8532 has a periodic light
curve, with an ∼690d cycle. Spectral energy density model fitting
results indicate that G335.9960-00.8532 is a relatively evolved MYSO;
thus, we may be witnessing the very early stages of a hyper- or
ultra-compact HII region, a key source for understanding MYSO evolution.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 5 Properties of selected variable sources
fig2.dat 53 667 Infrared light curves of variable sources
in W1 and W2 bands
fig2b.dat 63 60 Averaged Infrared light curves of variable sources
in W1 and W2 bands
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See also:
V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)
II/328 : AllWISE Data Release (Cutri+ 2013)
J/A+A/461/183 : Variability of classical T Tauri (Grankin+, 2007)
J/A+A/461/11 : Radio observations of MYSO candidates (Urquhart+, 2007)
J/A+A/474/891 : 13CO obs. of YSOs in South Gal. plane (Urquhart+, 2007)
J/A+A/487/253 : The RMS survey: 13CO observations of YSOs (Urquhart+ 2008)
J/A+A/498/147 : High mass protostellar objects parameters (Grave+, 2009)
J/A+A/501/539 : RMS survey. 6cm observations of YSOs (Urquhart+, 2009)
J/ApJ/717/L133 : Formaldehyde maser flares in IRAS 18566+0408 (Araya+, 2010)
J/ApJ/733/50 : MIR phot. monitoring of the ONC (Morales-Calderon+, 2011)
J/MNRAS/424/1925 : Spectrocopic Binarity of O and B type stars (Chini+, 2012)
J/ApJ/754/45 : IR properties of Swift/BAT X-ray AGNs (Ichikawa+, 2012)
J/ApJS/208/11 : Red MSX Source Survey: massive protostars (Lumsden+, 2013)
J/A+A/561/A2 : 36 accreting YSOs emission lines (Alcala+, 2014)
J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)
J/AJ/148/122 : YSOVAR: infrared photometry in Lynds 1688 (Gunther+, 2014)
J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)
J/A+A/591/A149 : Hi-GAL. inner Milky Way: +68≥l≥70 (Molinari+, 2016)
J/ApJ/835/74 : IR phot. of AGNs in Swift/BAT 70 month (Ichikawa+, 2017)
J/A+A/619/A41 : Photometric variability of massive YSOs (Teixeira+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- MSX6C Object name (GLLL.llll+BB.bbbb)
19- 25 F7.3 deg RAdeg [136.1/306.1] Right ascension (J2000)
27- 33 F7.3 deg DEdeg [-56.3/37.7] Declination (J2000)
35- 38 F4.2 mag W1mag [7.94/8.63] WISE W1 (3.4um) band magnitude (1)
40- 43 F4.2 mag W2mag [6.36/6.85]? WISE W2 (4.6um) band magnitude (1)
45- 48 F4.2 mag W3mag [2.34/3.84] WISE W3 (12um) band magnitude (1)
50- 54 F5.2 mag W4mag [-0.84/1.66] WISE W4 (22um) band magnitude (1)
56- 59 F4.2 mag W1mag2 [7.7/9.47]? WISE W1 (3.4um) band magnitude (2)
61- 64 F4.2 mag W2mag2 [6.5/6.5]? WISE W2 (4.6um) band magnitude (2)
66- 70 F5.2 mag delW1 [-0.35/1.17]? W1mag difference
between Epoch 1 and Epoch 2
72- 76 F5.2 mag delW2 [-0.35/-0.35]? W2mag difference
between Epoch 1 and Epoch 2
78- 81 A4 --- Var Variability type flag (3)
83- 89 A7 --- Col Color variability type as discussed
in Section 3.1.2 (BB = bluer when brighter)
91- 96 E6.3 Lsun Lbol [545/45800] Bolometric luminosity
from Lumsden+ 2013, J/ApJS/208/11
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Note (1): Profile-fitting flux densities from W1 to W4 obtained by ALLWISE for
the first epoch, while only W1 and W2 are selected data as described
in Section 2.2
Note (2): Profile-fitting flux densities from W1 and W2 obtained by ALLWISE for
the second epoch using selected data.
Note (3): Variability type flag as discussed in Section 3.1.1. Code as follows:
P = periodic variability,
dip = dipper
I Pl = increase with plateau
D Pl = decrease with plateau
O = other.
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Byte-by-byte Description of file:fig2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- MSX6C Identifier
19- 29 F11.5 d MJD [55250.6/58461.8] Modified Julian Date
31- 35 F5.3 mag W1mag [7.53/9.66]? WISE 3.4 micron band magnitude
37- 41 F5.3 mag e_W1mag [0.01/0.04] Uncertainty in W1mag
43- 47 F5.3 mag W2mag [6.27/7.28]? WISE 4.6 micron band magnitude
49- 53 F5.3 mag e_W2mag [0.006/0.11]? Uncertainty in W2mag
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Byte-by-byte Description of file: fig2b.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- MSX6C Identifier
19- 29 F11.5 d MJD [55251.2/58460.9] Modified Julian Date
31- 35 F5.3 mag W1mag [7.67/9.61] Averaged WISE 3.4um band magnitude
37- 41 F5.3 mag e_W1mag [0.009/0.2]? Uncertainty in W1mag
43- 46 F4.1 --- o_W1mag [1/19]? Number of W1 magnitude used in W1mag (1)
48- 52 F5.3 mag W2mag [6.3/7.24]? Averaged WISE 4.6um band magnitude
54- 58 F5.3 mag e_W2mag [0.01/0.08]? Uncertainty in W2mag
60- 63 F4.1 --- o_W2mag [0/19]? Number of W2 magnitude used in W2mag (1)
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Note (1): Available only for ALLWISE data.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Feb-2021