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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
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:
FileName Lrecl Records Explanations
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) (table3)
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
Bytes Format Units Label Explanations
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)
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), Bejar et al. (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).
Byte-by-byte Description of file: table23.dat
Bytes Format Units Label Explanations
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
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.
Global notes: Note (G1): Disk classification as follows: EV = evolved disk II = thick disk III = diskless TD = transition disk candidate
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Apr-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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