2013ApJ...778...64L

Query : 2013ApJ...778...64L

2013ApJ...778...64L - Astrophys. J., 778, 64 (2013/November-3)

Another brick in understanding chemical and kinematical properties of BSSs: NGC 6752.

LOVISI L., MUCCIARELLI A., DALESSANDRO E., FERRARO F.R. and LANZONI B.

Abstract (from CDS):

We used high-resolution spectra acquired with the multifiber facility FLAMES at the Very Large Telescope of the European Southern Observatory to investigate the chemical and kinematical properties of a sample of 22 blue straggler stars (BSSs) and 26 red giant branch stars in the nearby globular cluster NGC 6752. We measured radial and rotational velocities and Fe, O, and C abundances. According to radial velocities, metallicity, and proper motions, we identified 18 BSSs as likely cluster members. We found that all the BSSs rotate slowly (less than 40 km/s), similar to the findings in 47 Tucanae, NGC 6397, and M30. The Fe abundance analysis reveals the presence of three BSSs affected by radiative levitation (showing [Fe/H] significantly higher than that measured in "normal" cluster stars), confirming that element transport mechanisms occur in the photosphere of BSSs hotter than ≃8000 K. Finally, BSS C and O abundances are consistent with those measured in dwarf stars. No C and O depletion ascribable to mass transfer processes has been found on the atmospheres of the studied BSSs (at odds with previous results for 47 Tucanae and M30), suggesting the collisional origin for BSSs in NGC 6752 or that the CO depletion is a transient phenomenon.

Abstract Copyright: ∼

Journal keyword(s): blue stragglers - globular clusters: individual: NGC 6752 - stars: abundances - stars: evolution - techniques: spectroscopic

Nomenclature: Table 1: [LMD2013] BSSNN (Nos BSS1-BSS18). Table 2: [LMD2013] RGBNN (Nos RGB1-RGB26).

Simbad objects: 51

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Number of rows : 51
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
3 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
4 [LMD2013] RGB20 RG* 19 09 48.3555446208 -60 13 00.989250708   15.86   14.88   ~ 1 0
5 2MASS J19095506-6002132 RG* 19 09 55.0747534584 -60 02 13.268118444   16.42   15.47   ~ 2 0
6 2MASS J19095724-6000550 RG* 19 09 57.2526653760 -60 00 55.098591732   16.25   15.31   ~ 2 0
7 Cl* NGC 6752 SAW V13 SX* 19 10 14.2944580608 -60 05 04.038130212   16.54 16.26   16.04 ~ 7 0
8 2MASS J19101615-6005190 RG* 19 10 16.1482843104 -60 05 19.192020324   16.42   15.51   ~ 2 0
9 [LMD2013] RGB21 RG* 19 10 16.5289729176 -60 11 13.535907936   16.32   15.38   ~ 1 0
10 2MASS J19102309-6004274 RG* 19 10 23.0843522113 -60 04 27.557880251   16.23 15.80 15.28   ~ 7 0
11 [LMD2013] RGB23 RG* 19 10 26.7163 -60 10 42.486   16.39   15.48   ~ 1 0
12 GES J19102676-6006576 RG* 19 10 26.7825727632 -60 06 57.667484412   16.38 15.96 15.44   ~ 6 0
13 Cl* NGC 6752 SAW V12 SX* 19 10 34.1958 -59 56 56.952   16.56 16.27   15.83 ~ 8 0
14 [LMD2013] RGB22 RG* 19 10 39.2336002608 -60 10 56.423617896   16.29   15.36   ~ 1 0
15 [LMD2013] BSS4 BS* 19 10 43.8570 -59 58 29.659     16.59   16.15 ~ 1 0
16 Cl* NGC 6752 SAW V21 BS* 19 10 44.9317 -60 00 35.868   16.813 16.477   16.23 ~ 2 0
17 [LMD2013] BSS5 BS* 19 10 45.5418 -59 59 30.764     16.71   16.11 ~ 1 0
18 [LMD2013] BSS9 BS* 19 10 47.9484 -59 58 42.676     17.11   16.63 ~ 1 0
19 [LMD2013] BSS3 BS* 19 10 48.9367 -59 59 27.711     16.45   15.88 ~ 1 0
20 [LMD2013] RGB25 RG* 19 10 49.5311102592 -60 07 48.199307088   16.42 16.07 15.54   ~ 4 0
21 [LMD2013] BSS8 BS* 19 10 51.3946 -59 58 18.690     16.72   16.38 ~ 1 0
22 [LMD2013] BSS2 BS* 19 10 52.0475 -59 59 04.647     15.62   15.48 ~ 2 0
23 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
24 [LMD2013] BSS7 BS* 19 10 52.9954 -59 58 40.948 17.620 17.14 16.74   16.13 ~ 2 0
25 Cl* NGC 6752 SAW V7 SX* 19 10 54.0686407791 -60 00 12.443857379   15.88 15.59   15.26 ~ 8 0
26 [LMD2013] BSS12 BS* 19 10 55.0648 -59 58 57.653     16.24   15.91 ~ 1 0
27 [LMD2013] BSS13 BS* 19 10 55.1992 -59 58 51.646     16.65   16.06 ~ 1 0
28 [LMD2013] BSS1 BS* 19 10 57.8291372585 -59 57 48.344958124     15.49   15.27 ~ 4 0
29 [LMD2013] BSS14 BS* 19 11 01.1123 -59 59 20.882     16.63   16.19 ~ 1 0
30 2MASS J19110309-6002282 RG* 19 11 03.09432 -60 02 28.2732   16.20   15.27   ~ 2 0
31 [LMD2013] RGB24 RG* 19 11 03.7325634048 -60 09 00.672858828   15.82   14.86   ~ 1 0
32 [LMD2013] BSS10 BS* 19 11 04.0540582947 -59 59 07.466184506 15.410 15.381 15.27   15.19 ~ 6 0
33 2MASS J19110507-6001459 RG* 19 11 05.0877374352 -60 01 45.836387904   16.35 15.96 15.42   ~ 5 0
34 2MASS J19110733-6002460 RG* 19 11 07.3396557912 -60 02 45.998338020   16.35   15.41   ~ 2 0
35 2MASS J19110826-6004174 RG* 19 11 08.2812060360 -60 04 17.399668188   16.40   15.47   ~ 2 0
36 [LMD2013] BSS15 BS* 19 11 08.4477405456 -60 01 08.313205404     16.17   15.68 ~ 1 0
37 2MASS J19110968-6003034 RG* 19 11 09.6931513728 -60 03 03.359468844   15.77   14.79   ~ 2 0
38 [LMD2013] BSS16 BS* 19 11 10.0373197944 -59 58 50.439873144     16.83   16.31 ~ 1 0
39 2MASS J19111465-6000442 RG* 19 11 14.6606758584 -60 00 44.259456636   16.47 16.05 15.54   ~ 5 0
40 2MASS J19111927-6003518 RG* 19 11 19.27056 -60 03 51.8256   15.87   14.92   ~ 2 0
41 [LMD2013] RGB26 RG* 19 11 25.1314552632 -60 11 02.546203236   16.13   15.19   ~ 1 0
42 2MASS J19112839-6002302 RG* 19 11 28.4073486528 -60 02 30.254636292   16.17   15.22   ~ 2 0
43 2MASS J19112917-6002002 RG* 19 11 29.1863046480 -60 02 00.280305852   16.16   15.22   ~ 2 0
44 2MASS J19113031-6002411 RG* 19 11 30.3146820192 -60 02 41.083489068   16.34 15.93 15.41   ~ 7 0
45 2MASS J19113124-6003567 RG* 19 11 31.2519978600 -60 03 56.744344404   15.71   14.75   ~ 3 0
46 2MASS J19113957-5958335 RG* 19 11 39.57816 -59 58 33.5244   16.35   15.41   ~ 2 0
47 2MASS J19114512-6002331 RG* 19 11 45.1292339760 -60 02 33.062296596   16.03 15.63 15.09   ~ 7 0
48 2MASS J19114773-5958290 RG* 19 11 47.7429770160 -59 58 29.189422812   16.07   15.13   ~ 2 0
49 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
50 V* SX Phe SX* 23 46 32.8928138474 -41 34 54.769886474   7.54 7.31     A3V 348 0
51 NAME Local Group GrG ~ ~           ~ 9325 0

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