Access to Astronomical Catalogues

← Click to display the menu
J/AJ/136/2321       Washington photometry of Bootes I stars  (Hughes+, 2008)

The age and metallicity of the Bootes I system. Hughes J., Wallerstein G., Bossi A. <Astron. J., 136, 2321-2331 (2008)> =2008AJ....136.2321H
ADC_Keywords: Galaxies, photometry ; Populations, stellar ; Photometry, CMT1T2V Keywords: galaxies: dwarf - galaxies: individual (Bootes I) - Local Group Abstract: We present Washington CT1T2 photometry of a field central to the Bootes I dwarf spheroidal galaxy, which was discovered as a stellar overdensity in the Sloan Digital Sky Survey (DR5). We show that the Washington filters are much more effective than the Sloan filters in separating the metal-poor turn-off stars in the dwarf galaxy from the foreground stars. We detect 165 objects in the field, and statistically determine that just over 40% of the objects are nonmembers. Our statistical analysis mostly agrees with radial velocity measurements of the brighter stars. We find that there is a distinct main-sequence turn-off and subgiant branch, where there is some evidence of a spread in chemical abundance. Description: We observed one field centered on (RA=14:00:06, DE=14:5; J2000) with the Apache Point Observatory (APO) 3.5m telescope, using the direct-imaging SPIcam system. The data set for Bootes I was taken on 2007 March 19. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 111 165 Sample of objects in Bootes I central field
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Running identification number, <[HWB2008] NNN> in Simbad 5- 11 F7.3 pix Xpix X pixel coordinate 13- 20 F8.3 pix Ypix Y pixel coordinate 22- 27 F6.3 mag T1mag Washington T1 band magnitude 29- 33 F5.3 mag e_T1mag The 1σ error in T1mag 35- 40 F6.3 mag Cmag Washington C band magnitude 42- 46 F5.3 mag e_Cmag The 1σ error in Cmag 48- 53 F6.3 mag T2mag Washington T2 band magnitude 55- 59 F5.3 mag e_T2mag The 1σ error in T2mag 61- 62 I2 h RAh Hour of Right Ascension (J2000) 64- 65 I2 min RAm Minute of Right Ascension (J2000) 67- 71 F5.2 s RAs Second of Right Ascension (J2000) 73- 74 I2 deg DEd Degree of Declination (J2000) 76- 77 I2 arcmin DEm Arcminute of Declination (J2000) 79- 82 F4.1 arcsec DEs Arcsecond of Declination (J2000) 84 A1 --- n_Seq [A-F] Star status (1) 86-111 A26 --- Remarks Additional information on star (1)
Note (1): Source type code as follows: A = Source has passed statistical cleaning and color-selection, and has an uncertainties better than 0.05 in all filters B = Source has passed statistical cleaning and color-selection, does not have uncertainties better than 0.05 in all filters C = Source has passed color-selection, failed statistical cleaning, and has uncertainties better than 0.05 in all filters D = Source has passed color-selection, failed statistical cleaning, and does not have uncertainties better than 0.05 in all filters E = Source has passed statistical cleaning but failed color selection. F = Source has failed statistical cleaning and color selection VA = Source accepted by Martin et al.'s (2007, Cat. J/MNRAS/380/281) radial velocity study VR = Source rejected by Martin et al.'s (2007, Cat. J/MNRAS/380/281) radial velocity study BSS = Possibly a blue straggler star
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 26-May-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

catalogue service

© UDS/CNRS

Contact