J/ApJ/669/493 Spitzer/Chandra YSOs in Serpens cloud core (Winston+, 2007)
A combined Spitzer and Chandra survey of young stellar objects in the
Serpens cloud core.
Winston E., Megeath S.T., Wolk S.J., Muzerolle J., Gutermuth R., Hora J.L.,
Allen L.E., Spitzbart B., Myers P., Fazio G.G.
<Astrophys. J., 669, 493-518 (2007)>
=2007ApJ...669..493W 2007ApJ...669..493W
ADC_Keywords: X-ray sources ; YSOs ; Stars, pre-main sequence ;
Millimetric/submm sources ; Photometry, infrared
Keywords: circumstellar matter - infrared: stars - stars: pre-main sequence -
X-rays: stars
Abstract:
We present Spitzer and Chandra observations of the nearby (∼260pc)
embedded stellar cluster in the Serpens cloud core. We observed, using
Spitzer's IRAC and MIPS instruments, in six wavelength bands from 3 to
70um, to detect thermal emission from circumstellar disks and
protostellar envelopes and to classify stars using color-color
diagrams and SEDs. These data are combined with Chandra observations
to examine the effects of circumstellar disks on stellar X-ray
properties. Young diskless stars were also identified from their
increased X-ray emission. We have identified 138 YSOs in Serpens: 22
Class 0/I, 16 flat-spectrum, 62 Class II, 17 transition disk, and 21
Class III stars; 60 of these exhibit X-ray emission.
Description:
We have obtained Spitzer images of the Serpens cloud core in six
wavelength bands: the 3.6, 4.5, 5.8, and 8.0um bands of the Infrared
Array Camera (IRAC) on 2004 April 1 and 5, and the 24 and 70 um bands of
the Multiband Imaging Photometer for Spitzer (MIPS) on 2004 April 6
and 2005 April 12.
The photometry extracted from these data was supplemented by J,
H, and Ks band photometry from the Two Micron All Sky Survey (2MASS)
Point Source Catalog (Cat. VII/233), resulting in data in
nine photometric bands spanning 1-70um.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 62 137 Table of coordinates & other identifiers
table4.dat 147 137 Table of young stellar objects in Serpens
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See also:
J/A+A/421/623 : ISOCAM survey of YSOs in Serpens Cloud Core (Kaas+, 2004)
J/A+A/463/275 : Chandra obs. of Serpens star-forming region (Giardino+, 2007)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [WMW2007] Spitzer identification number
5- 6 I2 h RAh Hour of Right Ascension (J2000)
8- 9 I2 min RAm Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- Sign of Declination (J2000)
18- 19 I2 deg DEd Degree of Declination (J2000)
21- 22 I2 arcmin DEm Arcminute of Declination (J2000)
24- 28 F5.2 arcsec DEs Arcsecond of Declination (J2000)
30- 38 A9 --- EC Eiroa et al. (1992A&A...262..468E 1992A&A...262..468E)
identifier (1)
40- 42 I3 --- [KOB2004] ? Kaas et al. (2004, Cat. J/A+A/421/623)
identifier ([KOB2004] NNNa)
43 A1 --- --- [/]
44- 46 I3 --- [KOB2004]2 ? Second Kaas et al. (2004, Cat.
J/A+A/421/623) identifier
48- 56 A9 --- Class0 Testi et al. (1998ApJ...508L..91T 1998ApJ...508L..91T); Williams
and Meyers (1999ApJ...518L..37W 1999ApJ...518L..37W); Davis et
al. (1999MNRAS.309..141D 1999MNRAS.309..141D) identifier (2)
58- 59 I2 --- CX ? Chandra identification number
61- 62 I2 --- [GFM2007] ? Giardino et al. (2007, Cat.
J/A+A/463/275) identifier
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Note (1): Nomenclature note:
ECNNN = [EC92] NNN in Simbad
SVS4-NN = [EC89] SVS 4-NN in Simbad
Serpens NN = [B96] Serpens NN in Simbad
SVS20 = [SVS76] Ser 20 iin Simbad
CKNN = CK NN.
Note (2): Nomenclature note:
S68Na = [WM2000] S68Na in Simbad
PS 2 = [HB96] PS 2 in Simbad
SMM NN = [CED93] NN in Simbad
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [WMW2007] Spitzer identification number
5 A1 --- l_Jmag Limit flag on Jmag
7- 12 F6.3 mag Jmag ? The 2MASS J band magnitude
14- 18 F5.3 mag e_Jmag ? Uncertainty in Jmag
20 A1 --- l_Hmag Limit flag on Hmag
22- 27 F6.3 mag Hmag ? The 2MASS J band magnitude
29- 33 F5.3 mag e_Hmag ? Uncertainty in Hmag
35 A1 --- l_Kmag Limit flag on Kmag
37- 42 F6.3 mag Kmag ? The 2MASS J band magnitude
44- 48 F5.3 mag e_Kmag ? Uncertainty in Kmag
50- 55 F6.3 mag 3.6mag ? IRAC 3.6µm band magnitude
57- 62 F6.4 mag e_3.6mag ? Uncertainty in 3.6mag
63 A1 --- f_3.6mag [d] Flag on 3.6mag (1)
65- 70 F6.3 mag 4.5mag ? IRAC 4.5µm band magnitude
72- 76 F5.3 mag e_4.5mag ? Uncertainty in 4.5mag
78 A1 --- f_4.5mag [d] Flag on 4.5mag (1)
80- 85 F6.3 mag 5.8mag ? IRAC 5.8µm band magnitude
87- 91 F5.3 mag e_5.8mag ? Uncertainty in 5.8mag
93 A1 --- l_8.0mag Limit flag on 8.0mag
95-100 F6.3 mag 8.0mag ? IRAC 8.0µm band magnitude
102-109 F8.6 mag e_8.0mag ? Uncertainty in 8.0mag
111 A1 --- f_8.0mag [d] Flag on 8.0mag (1)
113-119 F7.4 mag 24mag ? MIPS 24.0µm band magnitude
121-125 F5.3 mag e_24mag ? Uncertainty in 24mag
127 A1 --- f_24mag [c] Flag on 24mag (1)
129-131 A3 --- Class Source classification (2)
133-134 I2 --- CX4 ? Chandra identification number
136-140 F5.2 --- alpha ? SED slope from available IRAC points (3)
142 A1 --- f_alpha [e] Flag on alpha slope (1)
144-147 F4.2 mag AK ? The K band extinction
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Note (1): Flag as follows:
d = Photometry at this wavelength is saturated
c = This source was saturated at 24µm, the photometry was fit
using the PSF wings as described in text
e = Slope & classification uncertain due to lack of photometry in all
Spitzer bands. The IR-excess may be due to a mismatch between the
2MASS & IRAC photometry
Note (2): The class is defined as follows:
0/1 = Class 0/I
FS = Flat Spectrum
2 = Class II
TD = Transition Disk
3 = Class III
Note (3): Note slopes of flat-spectrum (FS) objects fall between
-0.3<α<0.3 when 24µm point is included.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Jan-2010