J/A+A/548/A107 U,V photometry in M2 (NGC 7089) (Lardo+, 2012)
Carbon and nitrogen abundances of stellar populations in the
globular cluster M2.
Lardo C., Pancino E., Mucciarelli A., Milone, A.P.
<Astron. Astrophys. 548, A107 (2012)>
=2012A&A...548A.107L 2012A&A...548A.107L
ADC_Keywords: Clusters, globular ; Photometry, UBV
Keywords: stars: abundances - globular clusters: individual: M 2
Description:
We present U, V photometry of the globular cluster M2. Stars within
1' and outside of 4' from the cluster center are excluded from the CMD
to reduce blending effects and the field star contamination,
respectively. We imposed on all stars the selection limits of CHI<2.0
and -1<SHARP<1 on DAOPHOT II photometric parameters. To select a
sample of well-measured stars we have followed the procedure given in
Lardo et al. (2012A&A...541A.141L 2012A&A...541A.141L), Sect. 5.1. M2 photometry displays
an anomalous branch beyond the red edge of the main body of the RGB.
The difference in color between stars belonging to this structure and
normal RGB stars is quite large (of the order of 0.2-0.3mag, well
above the typical measurement errors) and extends down to the SGB
region. There may be a second group of stars that are 0.3mag redder
with respect to this sequence and can possibly be more, anomalous RGB
stars.
The observations were carried out during the nights of 2010 July 15 at
the Telescopio Nazionale Galileo (TNG) located in La Palma, Canary
Islands (Spain), with he DOLORES camera. The DOLORES camera offers a
field of view of 8.6'x8.6' with a 0.252"/pix scale. We obtained images
of the cluster in the standard Johnson U and V filters for a total of
540s shifted in 3 single exposures in each filter. The seeing
condition were average during (∼1.2-1.3") during the observing night.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 60 3022 Photometry of M2: selected sample
table2.dat 97 39 Index measurements, magnitudes, colors, and
radial velocities for the sample stars
table4.dat 43 35 Atmospheric parameters and carbon and nitrogen
abundances for sample stars
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See also:
J/AJ/117/2868 : BV photometry in M2 (NGC 7089) (Lee+, 1999)
J/ApJS/182/509 : Blue stragglers in M2 (Dalessandro+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID [164/21800] Star identifier (1)
7- 17 F11.7 deg RAdeg Right ascension (J2000)
20- 29 F10.7 deg DEdeg Declination (J2000)
32- 37 F6.3 mag Vmag The V band magnitude
40- 44 F5.3 mag e_Vmag Formal DAOPHOT errors associated to V magnitude
47- 52 F6.3 mag U-V The U-V color index
56- 60 F5.3 mag e_Umag Formal DAOPHOT errors associated to U magnitude
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Note (1): We identify stars with the DAOPHOT ID number.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID [1047/22170] Star identifier
7- 12 I6 --- IDSDSS DAOPHOT ID number (1)
14- 25 F12.8 deg RAdeg Right ascension (J2000)
27- 37 F11.8 deg DEdeg Declination (J2000)
39- 44 F6.3 mag Vmag V magnitude
46- 51 F6.4 mag U-V U-V colour index
53- 55 I3 km/s RV Radial velocity
57- 58 I2 km/s e_RV rms uncertainty on RV
60- 65 F6.3 mag CN CN index
67- 71 F5.3 mag e_CN rms uncertainty on CN
73- 78 F6.3 mag dCN Rectified δCN index
80- 84 F5.3 mag CH CH index
86- 90 F5.3 mag e_CH rms uncertainty on CH
92- 97 F6.3 mag dCH Rectified δCH index
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Note (1): IDSDSS is the DAOPHOT ID number from An et al.
(2008ApJS..179..326A 2008ApJS..179..326A) photometric catalog.
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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- 5 I5 --- ID [1047/22170] Star identifier
7- 10 I4 K Teff [4630/5581] Effective temperature
12- 14 I3 K e_Teff rms uncertainty on Teff
16- 18 F3.1 [cm/s2] logg [1.6/3] Surface gravity
20- 23 F4.2 [cm/s2] e_logg rms uncertainty on logg
25- 28 F4.2 --- A(C) [5.45/6.47] Carbon abundance
30- 33 F4.2 --- e_A(C) rms uncertainty on A(C)
35- 38 F4.2 --- A(N) [6.11/7.77] Nitrogen abundance
40- 43 F4.2 --- e_A(N) rms uncertainty on A(N)
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Acknowledgements:
Carmela Lardo, carmela.lardo2(at)unibo.it
History:
* 30-Nov-2012: on-line version of table1
* 23-May-2014: tables 2 and 4 added (from electronic version)
(End) Patricia Vannier [CDS] 01-Oct-2012