J/A+A/525/A47 U-band photometry in sigma Orionis region (Rigliaco+, 2011)
U-band study of the accretion properties in the σ Orionis
star-forming region.
Rigliaco E., Natta A., Randich S., Testi L., Biazzo K.
<Astron. Astrophys., 525, A47 (2011)>
=2011A&A...525A..47R 2011A&A...525A..47R
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, infrared ;
Photometry, millimetric/submm
Keywords: stars: formation - accretion, accretion disks -
open clusters and associations: individual: sigma Orionis
Abstract:
This paper presents the results of an U band survey with FORS1/VLT of
a large area in the sigma Ori star-forming region. We combine the
U-band photometry with literature data to compute accretion luminosity
and mass accretion rates from the U-band excess emission for all
objects (187) detected by Spitzer in the FORS1 field and classified by
Hernandez et al. (2007, Cat. J/ApJ/662/1067) as likely members of the
cluster.
Description:
We have performed a U-band survey that covers a total field of
∼1000arcmin2 in the sigma Orionis cluster. Observations were carried
out with FORS1 mounted on the UT2 telescope at the VLT using filter
and were performed in service mode during seven nights from October
2008 to March 2009.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec2.dat 114 186 U-band and collected literature photometry
table23.dat 47 81 Accretion properties of the class II objects and
objects with transitional and evolved disks (table2)
and objects taken from Gatti et al.
(2008A&A...481..423G 2008A&A...481..423G) (table3)
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See also:
J/AJ/128/2316 : BVRIJHKs photometry in sigma Ori cluster (Sherry+, 2004)
J/MNRAS/356/89 : sigma Ori low-mass stars (Kenyon+, 2005)
J/ApJ/662/1067 : Spitzer observations of sigma Orionis (Hernandez+, 2007)
Byte-by-byte Description of file: tablec2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [SO]
3- 6 I4 --- Name Identification number,
<[HHM2007] NNNN> in Simbad
8- 15 F8.5 deg RAdeg Right ascension in decimal degrees (J2000)
17- 24 F8.5 deg DEdeg Declination in decimal degrees (J2000)
26- 28 A3 --- Class Disk classification (G1)
30 A1 --- l_Umag Limit flag on Umag
31- 36 F6.3 mag Umag FORS1/u_High U magnitude (2)
37- 42 F6.3 mag Bmag ?=- B magnitude (3)
44- 49 F6.3 mag Vmag ?=- V magnitude (3)
51- 56 F6.3 mag Rmag ?=- Rc magnitude (3)
58- 63 F6.3 mag Imag ?=- Ic magnitude (3)
65- 70 F6.3 mag Jmag 2MASS J magnitude
72- 77 F6.3 mag Hmag 2MASS H magnitude
79- 84 F6.3 mag Kmag 2MASS Ks magnitude
86- 91 F6.3 mag [3.6] Spitzer/IRAC 3.6um magnitude (4)
92- 96 F5.2 mag [4.5] Spitzer/IRAC 4.5um magnitude (4)
98-102 F5.2 mag [5.8] Spitzer/IRAC 5.8um magnitude (4)
104-108 F5.2 mag [8.0] Spitzer/IRAC 8.0um magnitude (4)
110-114 F5.2 mag [24.0] ?=- Spitzer/MIPS 24.0um magnitude (4)
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Note (2): The U-band magnitudes have been obtained with FORS1@VLT,
Note (3): Optical photometry is from Sherry et al., 2004, Cat. J/AJ/128/2316),
Kenyon et al. (2005, Cat. J/MNRAS/356/89),
Zapatero-Osorio et al. (2002A&A...384..937Z 2002A&A...384..937Z),
Bejar et al. (2001ApJ...556..830B 2001ApJ...556..830B) and Wolk (1996, Ph.D. Thesis).
Note (4): The magnitudes in the four channels of the Infrared Array Camera
(IRAC; 3.8-8.0um) and the first channel of the Multiband Imaging
Photometer for Spitzer (MIPS; 24um) are from Hernandez et al. (2007,
Cat. J/ApJ/662/1067).
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Byte-by-byte Description of file: table23.dat
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Bytes Format Units Label Explanations
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1 I1 --- Tab [2/3] Original table number (1)
3- 4 A2 --- --- [SO]
5- 8 I4 --- Name Identification number,
<[HHM2007] NNNN> in Simbad
10- 11 A2 --- Class Disk classification (G1)
13- 16 F4.2 Msun M* Stellar mass
18- 21 F4.2 solLum L* Stellar luminosity
23- 26 I4 K Teff Effective temperature
28 A1 --- l_logLacc Limit flag on logLacc
29- 33 F5.2 [Lsun] logLacc ? Accretion luminosity
34- 36 A3 --- n_logLacc [sat ] sat for saturated
38 A1 --- l_logMacc Limit flag on logMacc
39- 44 F6.2 [Msun/yr] logMacc ? Mass accretion rate
45- 47 A3 --- n_logMacc [sat ] sat for saturated
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Note (1): For data from table3, the masses and luminosities of the listed
stars have been recomputed according the Baraffe et al. (1998, Cat.
J/A+A/337/403) evolutionary tracks.
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Global notes:
Note (G1): Disk classification as follows:
EV = evolved disk
II = thick disk
III = diskless
TD = transition disk candidate
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Apr-2011