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

Query : 2007A&A...464..201M

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

Full paper

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Number of rows : 70

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	2MASS J00035283-1940468	LP*	00 03 52.8352621632	-19 40 46.915970196	16.6	15.8			~	3	0
2	2MASS J00131891-2301528	LP?	00 13 18.9171113208	-23 01 52.828641048	15.9	16.4			~	4	0
3	2MASS J00135624-1721554	*	00 13 56.2611402264	-17 21 55.498058208	15.5	14.2			~	2	0
4	2MASS J00170214+0104165	*	00 17 02.1523475472	+01 04 16.579689096	15.5	14.7			~	2	0
5	CRTS J002235.6-051207	AB*	00 22 35.6380603176	-05 12 07.892987328	15.7	13.41			~	6	0
6	2MASS J00264668-1526427	*	00 26 46.6866396072	-15 26 42.637609032	15.6	14.6			~	2	0
7	2MASS J00321654-1851113	*	00 32 16.5430127160	-18 51 11.379129624	16.5	15.9			~	2	0
8	2MASS J00390964-1322429	LP?	00 39 09.6478819944	-13 22 43.153942944	16.2	15.1			~	2	0
9	2MASS J00464414-0659259	*	00 46 44.1444115992	-06 59 26.009404404	16.9	15.9			~	3	0
10	2MASS J00480460-1131551	LP*	00 48 04.5937389864	-11 31 55.231717260	16.3	14.9			~	2	0
11	2MASS J00522982-1518360	*	00 52 29.8293888264	-15 18 36.114882012	16.4	15.4			~	2	0
12	GR* 85	LP*	00 53 20.1304288008	-05 29 47.765652576			14.117		~	5	0
13	2MASS J00542073-0449174	LP*	00 54 20.7450637128	-04 49 17.572908720	16.3	14.9			~	2	0
14	2MASS J00563325-2154386	*	00 56 33.2644499856	-21 54 38.676219372	15.6	14.8			~	2	0
15	2MASS J01011934-1536343	*	01 01 19.3524349176	-15 36 34.291673064	15.8	15.0			~	2	0
16	2MASS J01015376-1015085	*	01 01 53.7531872400	-10 15 08.516404116	16.1	15.2			~	2	0
17	ATO J017.3296-15.1377	LP*	01 09 19.1278393464	-15 08 15.677713428	16.4	15.0			~	7	0
18	2MASS J01212317-1036096	LP*	01 21 23.1768240912	-10 36 09.639191484	16.0	14.7			~	2	0
19	2MASS J01225543+0451341	*	01 22 55.4352759528	+04 51 34.180730028					~	1	0
20	2MASS J01282756-0505173	*	01 28 27.5547889488	-05 05 17.546798184	16.2	15.1			~	2	0
21	2MASS J01295300+0055392	*	01 29 53.0017292640	+00 55 39.212977080					~	3	0
22	2MASS J01305453+0351575	*	01 30 54.5496870648	+03 51 57.602285460					~	1	0
23	2MASS J01492111+0231536	*	01 49 21.1245863832	+02 31 53.593981248					~	1	0
24	2MASS J01512105-0727451	*	01 51 21.0408567624	-07 27 45.204152616	16.4	15.5			~	2	0
25	2MASS J01520195+0020525	*	01 52 01.9555410240	+00 20 52.382638716					~	1	0
26	2MASS J01574156-1709471	*	01 57 41.5644444288	-17 09 47.141484624	16.0	15.2			~	2	0
27	2MASS J01593606-0801131	LP*	01 59 36.0678449232	-08 01 13.219755024	16.5	15.2			~	2	0
28	NAME Sagittarius Stream	St*	02 22	+00.0					~	846	0
29	2MASS J02224517+0039362	*	02 22 45.1766049432	+00 39 36.467632008					~	1	0
30	2MASS J08491184+4819380	*	08 49 11.8414459896	+48 19 37.979817456					~	1	0
31	2MASS J09193349+4350034	RG*	09 19 33.4874708664	+43 50 03.259032936					~	5	0
32	2MASS J09364419+0704484	*	09 36 44.2032846240	+07 04 48.309189708					~	1	0
33	2MASS J09453656+0937568	*	09 45 36.5720904960	+09 37 56.895427236					~	1	0
34	2MASS J09564707+0645292	*	09 56 47.0784739488	+06 45 29.123302032					~	1	0
35	2MASS J10055844+3132597	*	10 05 58.4460883968	+31 32 59.773203492					~	1	0
36	2MASS J10413374+4033099	Pe*	10 41 33.7466419416	+40 33 09.810733068					~	4	0
37	2MASS J10472976+2339508	*	10 47 29.7653717040	+23 39 50.823641196					~	1	0
38	2MASS J10504744+2748542	*	10 50 47.4549630192	+27 48 54.274833288					~	1	0
39	2MASS J11345053-0700511	LP?	11 34 50.5386828552	-07 00 51.143793300					~	1	0
40	2MASS J11554802-0339068	LP?	11 55 48.0224751600	-03 39 06.865162524					~	1	0
41	2MASS J13091343+1215502	*	13 09 13.4438067888	+12 15 50.197630680	15.4	13.9			~	2	0
42	UCAC4 420-059396	*	14 11 22.0417006224	-06 10 13.085621508	15.446	13.867	13.590	11.866	~	11	0
43	ATO J218.5212+09.6071	Pe*	14 34 05.0924465808	+09 36 25.814368368					~	7	0
44	NAME SDG	G	18 55 03.1	-30 28 42	4.5	3.6			~	2118	2
45	M 54	GlC	18 55 03.33	-30 28 47.5					~	1045	0
46	2MASS J21153360-3530060	*	21 15 33.6011696376	-35 30 06.031100124	16.8	15.8			~	2	0
47	2MASS J21174714-2432331	*	21 17 47.1403082280	-24 32 33.169689024	17.0	16.1			~	2	0
48	2MASS J21250780-2747090	*	21 25 07.7957857536	-27 47 09.098076084	15.6	14.5			~	2	0
49	2MASS J21314538-3513510	*	21 31 45.3814547520	-35 13 51.013420572	16.8	15.8			~	2	0
50	CRTS J215820.0-340605	LP*	21 58 19.9315064856	-34 06 07.451165376	15.7	14.30			~	4	0
51	2MASS J22083965-2812124	*	22 08 39.6486263280	-28 12 12.513552768	15.5	14.9			~	2	0
52	ATO J333.6117-23.1051	LP*	22 14 26.8029734472	-23 06 18.448590960	16.0	15.2			~	4	0
53	2MASS J22264953-3918313	*	22 26 49.5332240952	-39 18 31.483996920	15.8	14.6			~	2	0
54	2MASS J22373980-2628544	LP?	22 37 39.8025019008	-26 28 54.506425404	15.7	14.8			~	3	0
55	ATO J339.8435-25.1367	LP?	22 39 22.4618184024	-25 08 12.073551468	15.7	14.8			~	4	0
56	2MASS J22442231-3247156	*	22 44 22.3103708352	-32 47 15.698214780	15.9	14.9			~	2	0
57	2MASS J22561212-2045555	*	22 56 12.1237507560	-20 45 55.580299488	16.3	15.2			~	2	0
58	2MASS J23194353-1546105	*	23 19 43.5451634832	-15 46 10.512525864	16.3	15.2			~	2	0
59	GR* 390	LP?	23 21 26.5271763144	-24 26 54.507450912			14.653		~	5	0
60	2MASS J23241474-2750339	*	23 24 14.7441152040	-27 50 34.001220912	16.5	15.7			~	3	0
61	2MASS J23262366-2500371	LP*	23 26 23.6691835224	-25 00 37.135249380	16.0	14.8			~	2	0
62	ATO J352.3753-24.9694	LP?	23 29 30.0844354368	-24 58 09.795576324	16.4	14.9			~	4	0
63	2MASS J23295478-2051034	*	23 29 54.7822360680	-20 51 03.393590832	15.7	14.8			~	2	0
64	2MASS J23303457-1607474	*	23 30 34.5710918112	-16 07 47.406967176	15.9	14.8			~	2	0
65	2MASS J23430789-2358264	*	23 43 07.8868518672	-23 58 26.557037472	16.1	14.9			~	2	0
66	2MASS J23454168-2644555	*	23 45 41.6961863160	-26 44 55.517037360	15.2	14.1			~	3	0
67	ATO J357.6505-20.0376	LP*	23 50 36.1333705392	-20 02 15.609958512	16.3	15.4			~	6	0
68	2MASS J23531941-2050407	*	23 53 19.3978946688	-20 50 40.680952404	16.2	15.2			~	3	0
69	2MASS J23563742-2347116	*	23 56 37.4152797576	-23 47 11.744121660	15.9	15.1			~	2	0
70	2MASS J23565416-1906094	*	23 56 54.1577488872	-19 06 09.422407152	16.8	15.9			~	6	0

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