2007A&A...464..201M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST04:28:54

2007A&A...464..201M - Astronomy and Astrophysics, volume 464, 201-209 (2007/3-2)

High-resolution spectroscopy of RGB stars in the Sagittarius streams. I. Radial velocities and chemical abundances.

MONACO L., BELLAZZINI M., BONIFACIO P., BUZZONI A., FERRARO F.R., MARCONI G., SBORDONE L. and ZAGGIA S.

Abstract (from CDS):

The Sagittarius (Sgr) dwarf spheroidal galaxy is currently being disrupted under the strain of the Milky Way. A reliable reconstruction of Sgr star formation history can only be obtained by combining core and stream information. We present radial velocities for 67 stars belonging to the Sgr Stream. For 12 stars in the sample we also present iron (Fe) and α-element (Mg, Ca) abundances. Spectra were secured using different high resolution facilities: UVESLT, HARPS.6 m, and SARGNG. Radial velocities are obtained through cross correlation with a template spectra. Concerning chemical analysis, for the various elements, selected line equivalent widths were measured and abundances computed using the WIDTH code and ATLAS model atmospheres. The velocity dispersion of the trailing tail is found to be σ=8.3±0.9km/s, i.e., significantly lower than in the core of the Sgr galaxy and marginally lower than previous estimates in the same portion of the stream. Stream stars follow the same trend as Sgr main body stars in the [α/Fe] vs. [Fe/H] plane. However, stars are, on average, more metal poor in the stream than in the main body. This effect is slightly stronger in stars belonging to more ancient wraps of the stream, according to currently accepted models of Sgr disruption.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - galaxies: abundances - galaxies: evolution - galaxies: dwarf - galaxies: individual: Sgr dSph

VizieR on-line data: <Available at CDS (J/A+A/464/201): table1.dat appendix.dat>

Nomenclature: Table 1, col(2): [MBB2007] NNNNNN N=67 among (Nos 1-423286).

Simbad objects: 70

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Number of rows : 70

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 2MASS J00035283-1940468 * 00 03 52.8350725746 -19 40 46.916969066   16.6 15.8     ~ 3 0
2 2MASS J00131891-2301528 * 00 13 18.9170378862 -23 01 52.828486389   15.9 16.4     ~ 3 0
3 2MASS J00135624-1721554 * 00 13 56.2611445478 -17 21 55.498369077   15.5 14.2     ~ 2 0
4 2MASS J00170214+0104165 * 00 17 02.1523001172 +01 04 16.578701674   15.5 14.7     ~ 2 0
5 2MASS J00223563-0512079 LP* 00 22 35.6380543568 -05 12 07.893334155   15.7 13.41     ~ 3 0
6 2MASS J00264668-1526427 * 00 26 46.6866235385 -15 26 42.638386668   15.6 14.6     ~ 2 0
7 2MASS J00321654-1851113 * 00 32 16.5429100930 -18 51 11.380857248   16.5 15.9     ~ 2 0
8 2MASS J00390964-1322429 * 00 39 09.6476763910 -13 22 43.157824337   16.2 15.1     ~ 2 0
9 2MASS J00464414-0659259 * 00 46 44.1443366928 -06 59 26.010215530   16.9 15.9     ~ 2 0
10 2MASS J00480460-1131551 * 00 48 04.5938989452 -11 31 55.232924568   16.3 14.9     ~ 2 0
11 2MASS J00522982-1518360 * 00 52 29.8296823468 -15 18 36.114662414   16.4 15.4     ~ 2 0
12 2MASS J00532013-0529477 * 00 53 20.1303418849 -05 29 47.764858137   16.4       ~ 5 0
13 2MASS J00542073-0449174 * 00 54 20.7450556610 -04 49 17.571998468   16.3 14.9     ~ 2 0
14 2MASS J00563325-2154386 * 00 56 33.2643548848 -21 54 38.677284985   15.6 14.8     ~ 2 0
15 2MASS J01011934-1536343 * 01 01 19.3522488293 -15 36 34.291174042   15.8 15.0     ~ 2 0
16 2MASS J01015376-1015085 * 01 01 53.7531791457 -10 15 08.517233066   16.1 15.2     ~ 2 0
17 2MASS J01091912-1508157 * 01 09 19.1279132053 -15 08 15.677534676   16.4 15.0     ~ 2 0
18 2MASS J01212317-1036096 * 01 21 23.1767097846 -10 36 09.637993754   16.0 14.7     ~ 2 0
19 2MASS J01225543+0451341 * 01 22 55.4354544464 +04 51 34.181583614           ~ 1 0
20 2MASS J01282756-0505173 * 01 28 27.5549197353 -05 05 17.545809857   16.2 15.1     ~ 2 0
21 2MASS J01295300+0055392 * 01 29 53.0017836365 +00 55 39.212248108           ~ 1 0
22 2MASS J01305453+0351575 * 01 30 54.5496952582 +03 51 57.601898793           ~ 1 0
23 2MASS J01492111+0231536 * 01 49 21.1244788169 +02 31 53.593793975           ~ 1 0
24 2MASS J01512105-0727451 * 01 51 21.0408463918 -07 27 45.204195866   16.4 15.5     ~ 2 0
25 2MASS J01520195+0020525 * 01 52 01.9555155259 +00 20 52.382419025           ~ 1 0
26 2MASS J01574156-1709471 * 01 57 41.5643949878 -17 09 47.139312067   16.0 15.2     ~ 2 0
27 2MASS J01593606-0801131 * 01 59 36.0679304475 -08 01 13.217285362   16.5 15.2     ~ 2 0
28 NAME Sgr Stream St* 02 22 +00.0           ~ 611 0
29 2MASS J02224517+0039362 * 02 22 45.1766413528 +00 39 36.466250951           ~ 1 0
30 2MASS J08491184+4819380 * 08 49 11.8413448258 +48 19 37.981084743           ~ 1 0
31 2MASS J09193349+4350034 * 09 19 33.4875199640 +43 50 03.260148104           ~ 1 0
32 2MASS J09364419+0704484 * 09 36 44.2031577827 +07 04 48.310434211           ~ 1 0
33 2MASS J09453656+0937568 * 09 45 36.5721745356 +09 37 56.894905166           ~ 1 0
34 2MASS J09564707+0645292 * 09 56 47.0750990304 +06 45 29.117021166           ~ 1 0
35 2MASS J10055844+3132597 * 10 05 58.4460700511 +31 32 59.773668075           ~ 1 0
36 2MASS J10413374+4033099 * 10 41 33.7466636619 +40 33 09.811288704           ~ 2 0
37 2MASS J10472976+2339508 * 10 47 29.7653467128 +23 39 50.824274183           ~ 1 0
38 2MASS J10504744+2748542 * 10 50 47.4551429668 +27 48 54.275736267           ~ 1 0
39 2MASS J11345053-0700511 * 11 34 50.5386669847 -07 00 51.142900156           ~ 1 0
40 2MASS J11554802-0339068 * 11 55 48.0224456975 -03 39 06.864785967           ~ 1 0
41 2MASS J13091343+1215502 * 13 09 13.4438374711 +12 15 50.198934875   15.4 13.9     ~ 2 0
42 RAVE J141122.0-061013 * 14 11 22.0416141559 -06 10 13.085776368   15.446 13.867 12.55 11.866 ~ 7 0
43 [LLC2016] Vel-3+83 14 * 14 34 05.0923826388 +09 36 25.815729995           ~ 3 0
44 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1641 2
45 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 857 0
46 2MASS J21153360-3530060 * 21 15 33.6012462916 -35 30 06.030894911   16.8 15.8     ~ 2 0
47 2MASS J21174714-2432331 * 21 17 47.1402163673 -24 32 33.170211645   17.0 16.1     ~ 2 0
48 2MASS J21250780-2747090 * 21 25 07.7959502556 -27 47 09.099111331   15.6 14.5     ~ 2 0
49 2MASS J21314538-3513510 * 21 31 45.3814083538 -35 13 51.014263930   16.8 15.8     ~ 2 0
50 2MASS J21581991-3406074 * 21 58 19.9313687704 -34 06 07.450036873   15.7 14.5     ~ 2 0
51 2MASS J22083965-2812124 * 22 08 39.6485110809 -28 12 12.516203021   15.5 14.9     ~ 2 0
52 2MASS J22142679-2306184 * 22 14 26.8029603753 -23 06 18.450405504   16.0 15.2     ~ 3 0
53 2MASS J22264953-3918313 * 22 26 49.5333453723 -39 18 31.484654729   15.8 14.6     ~ 2 0
54 2MASS J22373980-2628544 * 22 37 39.8025425898 -26 28 54.505977039   15.7 14.8     ~ 3 0
55 2MASS J22392246-2508120 * 22 39 22.4616853164 -25 08 12.074517819   15.7 14.8     ~ 2 0
56 2MASS J22442231-3247156 * 22 44 22.3103125499 -32 47 15.698171730   15.9 14.9     ~ 2 0
57 2MASS J22561212-2045555 * 22 56 12.1235945488 -20 45 55.580079379   16.3 15.2     ~ 2 0
58 2MASS J23194353-1546105 * 23 19 43.5452019890 -15 46 10.512447481   16.3 15.2     ~ 2 0
59 2MASS J23212651-2426543 * 23 21 26.5271950609 -24 26 54.505048742   16.4       ~ 4 0
60 2MASS J23241474-2750339 * 23 24 14.7443086857 -27 50 34.004376106   16.5 15.7     ~ 3 0
61 2MASS J23262366-2500371 * 23 26 23.6692330872 -25 00 37.133987476   16.0 14.8     ~ 2 0
62 2MASS J23293008-2458096 * 23 29 30.0841532911 -24 58 09.798436935   16.4 14.9     ~ 3 0
63 2MASS J23295478-2051034 * 23 29 54.7820905450 -20 51 03.394091174   15.7 14.8     ~ 2 0
64 2MASS J23303457-1607474 * 23 30 34.5710490360 -16 07 47.407327831   15.9 14.8     ~ 2 0
65 2MASS J23430789-2358264 * 23 43 07.8867896835 -23 58 26.556762112   16.1 14.9     ~ 2 0
66 2MASS J23454168-2644555 * 23 45 41.6962520073 -26 44 55.516765782   15.2 14.1     ~ 3 0
67 2MASS J23503612-2002156 * 23 50 36.1333209240 -20 02 15.611141070   16.3 15.4     ~ 3 0
68 2MASS J23531941-2050407 * 23 53 19.3978274981 -20 50 40.681438974   16.2 15.2     ~ 3 0
69 2MASS J23563742-2347116 * 23 56 37.4152166361 -23 47 11.745177689   15.9 15.1     ~ 2 0
70 2MASS J23565416-1906094 * 23 56 54.1577688481 -19 06 09.421272859   16.8 15.9     ~ 2 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-04:28:54

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