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J/AJ/127/1014   CCD UBVRIHa photometry in NGC 3603           (Sung+, 2004)

The initial mass function and stellar content of NGC 3603. Sung H., Bessell M.S. <Astron. J., 127, 1014-1028 (2004)> =2004AJ....127.1014S
ADC_Keywords: Clusters, open ; X-ray sources ; Photometry, CCD ; Photometry, UBVRI ; Photometry, H-alpha Keywords: open clusters and associations: individual (NGC 3603) - stars: luminosity function, mass function Abstract: We present UBVRI and Hα photometry of the extremely compact, starburst cluster NGC 3603. Ground-based images, Hubble Space Telescope (HST) archival data, as well as Chandra X-ray data have been used for this study. We present, for the first time, optical color-magnitude diagrams (CMDs) for the stars in the cluster core down to V=22mag. A well-defined main sequence (MS) as well as low-mass pre-main-sequence (PMS) stars can clearly be seen in the CMDs. This result confirms the finding by Eisenhauer et al. (1998ApJ...498..278E) that low-mass stars are forming in the starburst cluster. We also derive an age (1±1Myr) and distance of the cluster (V0-MV=14.2±0.2mag, i.e., d=6.9±0.6kpc). Description: UBV(RI)c and Hα CCD photometry was acquired on 1997 June 2 at Siding Spring Observatory (SSO) with the 40 inch (1 m) telescope (f/8). To select X-ray emission PMS stars in the cluster, we have retrieved X-ray data from the Chandra X-Ray Observatory archive (observer ID: 663, PI: M. Corcoran) and used the events file (energy range: 0.3-10keV) and exposure map. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 79 26 Stars brighter than V=14 magnitudes in the HST/PC1 region table3.dat 48 11 X-Ray sources without optical counterparts brighter than V∼20 magnitudes table4.dat 97 73 Hα Emission Stars and Candidates from Siding Spring Observatory Observations table5.dat 68 96 Hα Emission Stars and Candidates from HST Observations
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- [SB2004] Sequential number 7- 8 I2 h RAh Right ascension (J2000.0) 10- 11 I2 min RAm Right ascension (J2000.0) 13- 17 F5.2 s RAs Right ascension (J2000.0) 19 A1 --- DE- Declination sign (J2000.0) 20- 21 I2 deg DEd Declination (J2000.0) 23- 24 I2 arcmin DEm Declination (J2000.0) 26- 29 F4.1 arcsec DEs Declination (J2000.0) 31- 36 F6.3 mag Vmag V magnitude 38- 43 F6.3 mag Icmag Cousins I magnitude 45- 49 F5.3 mag V-Ic Cousins V-I colour index 51- 55 F5.3 mag Rc-Ic ? Cousins R-I colour index 57- 66 A10 --- SpType MK Spectral type 69- 79 A11 --- Rem Remark (G1)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [SB2004]X Sequential number, [SB2004] X NN in Simbad 4- 5 I2 h RAh Right ascension (J2000.0) 7- 8 I2 min RAm Right ascension (J2000.0) 10- 14 F5.2 s RAs Right ascension (J2000.0) 16 A1 --- DE- Declination sign (J2000.0) 17- 18 I2 deg DEd Declination (J2000.0) 20- 21 I2 arcmin DEm Declination (J2000.0) 23- 26 F4.1 arcsec DEs Declination (J2000.0) 28- 32 F5.2 --- Sign Significance 34- 40 E7.2 ct/s CR Count Rate in the 0.3-10keV band 42- 48 E7.2 ct/s e_CR rms uncertainty on CR
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 I5 --- [SB2004] Identification number (1) 7- 8 I2 h RAh Hour of right ascension (J2000) 10- 11 I2 min RAm Minute of right ascension (J2000) 13- 17 F5.2 s RAs Second of right ascension (J2000) 19 A1 --- DE- Sign of the declination (J2000) 20- 21 I2 deg DEd Degree of declination (J2000) 23- 24 I2 arcmin DEm Arcminute of declination (J2000) 26- 29 F4.1 arcsec DEs Arcsecond of declination (J2000) 31- 36 F6.3 mag Vmag The V-band magnitude 38- 42 F5.3 mag V-Ic The Cousisns (V-I) color 44- 48 F5.3 mag B-V The (B-V) color 50- 55 F6.3 mag U-B ? The (U-B) color 57- 62 F6.3 mag Rc-Ha The Cousisns (R-Hα) color 64- 68 F5.3 mag D(Rc-Ha) (Rc-Hα) color difference between Hα emission PMS stars and normal MS stars 70- 97 A28 --- Rem Additional remarks (G1)
Note (1): The numbering system used is: 1-2044, bright stars (V≤17) from SSO observation 10001-11117, stars in PC1 20001-20892, stars in WF2 30001-30701, stars in WF3 40001-40746, stars in WF4 50001-60772, faint stars (V>18) from SSO observations.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 5 I5 --- [SB2004] Identification number 6 A1 --- --- [+] 7- 11 I5 --- m_[SB2004] ? Second Identification number 13- 14 I2 h RAh Hour of right ascension (J2000) 16- 17 I2 min RAm Minute of right ascension (J2000) 19- 23 F5.2 s RAs Second of right ascension (J2000) 25 A1 --- DE- Sign of the declination (J2000) 26- 27 I2 deg DEd Degree of declination (J2000) 29- 30 I2 arcmin DEm Arcminute of declination (J2000) 32- 35 F4.1 arcsec DEs Arcsecond of declination (J2000) 37- 42 F6.3 mag Vmag The V-band magnitude 44- 48 F5.3 mag V-Ic The Cousins (V-I) color 50- 55 F6.3 mag DHa Halpha magnitude difference between Halpha emission PMS stars and normal MS stars (1) 57- 67 A11 --- Rem Additional remarks (G1)
Note (1): The Hα index is defined by m{Hα}-(V+I)/2.
Global notes: Note (G1): Remarks: Hα = Hα emission star HαC = Hα emission candidate X = X-ray emission star SB = Star from this photometry
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jul-2004
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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