2013ApJ...765..157J

Query : 2013ApJ...765..157J

2013ApJ...765..157J - Astrophys. J., 765, 157 (2013/March-2)

Metallicity distribution functions, radial velocities, and alpha element abundances in three off-axis bulge fields.

JOHNSON C.I., RICH R.M., KOBAYASHI C., KUNDER A., PILACHOWSKI C.A., KOCH A. and DE PROPRIS R.

Abstract (from CDS):

We present radial velocities and chemical abundance ratios of [Fe/H], [O/Fe], [Si/Fe], and [Ca/Fe] for 264 red giant branch stars in three Galactic bulge off-axis fields located near (l, b) = (-5.5, -7), (-4, -9), and (+8.5, +9). The results are based on equivalent width and spectrum synthesis analyses of moderate resolution (R ~ 18,000), high signal-to-noise ratio (S/N ∼ 75-300 pixel–1) spectra obtained with the Hydra spectrographs on the Blanco 4 m and WIYN 3.5 m telescopes. The targets were selected from the blue side of the giant branch to avoid cool stars that would be strongly affected by CN and TiO; however, a comparison of the color-metallicity distribution in literature samples suggests that our selection of bluer targets should not present a significant bias against metal-rich stars. We find a full range in metallicity that spans [Fe/H] ~-1.5 to +0.5, and that, in accordance with the previously observed minor-axis vertical metallicity gradient, the median [Fe/H] also declines with increasing Galactic latitude in off-axis fields. The off-axis vertical [Fe/H] gradient in the southern bulge is estimated to be ∼0.4 dex/kpc; however, comparison with the minor-axis data suggests that a strong radial gradient does not exist. The (+8.5, +9) field exhibits a higher than expected metallicity, with a median [Fe/H] = -0.23, that might be related to a stronger presence of the X-shaped bulge structure along that line-of-sight. This could also be the cause of an anomalous increase in the median radial velocity for intermediate metallicity stars in the (+8.5, +9) field. However, the overall radial velocity and dispersion for each field are in good agreement with recent surveys and bulge models. All fields exhibit an identical, strong decrease in velocity dispersion with increasing metallicity that is consistent with observations in similar minor-axis outer bulge fields. Additionally, the [O/Fe], [Si/Fe], and [Ca/Fe] versus [Fe/H] trends are identical among our three fields, and are in good agreement with past bulge studies. We find that stars with [Fe/H] ≲ -0.5 are α-enhanced, and that the [α/Fe] ratios decline at higher metallicity. At [Fe/H] ≲ 0, the α-element trends are indistinguishable from the halo and thick disk, and the variations in the behavior of individual α-elements are consistent with production in massive stars and a rapid bulge formation timescale.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: bulge - Galaxy: stellar content - stars: abundances - stars: general - stars: Population II

VizieR on-line data: <Available at CDS (J/ApJ/765/157): table2.dat table3.dat table5.dat table6.dat table7.dat table8.dat>

Simbad objects: 270

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Number of rows : 270
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 * mu. Leo PM* 09 52 45.8170136628 +26 00 25.024269924 6.50 5.10 3.88 2.97 2.39 K2IIIbCN1Ca1 479 0
2 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
3 2MASS J17285469-1627232 RG* 17 28 54.6912801072 -16 27 23.246919576           ~ 1 0
4 2MASS J17285711-1633566 RG* 17 28 57.1153732320 -16 33 56.594139552           ~ 1 0
5 2MASS J17290285-1638344 RG* 17 29 02.8535927592 -16 38 34.465258536           ~ 1 0
6 2MASS J17290513-1630383 RG* 17 29 05.1258463968 -16 30 38.330258148           ~ 1 0
7 2MASS J17290874-1632431 RG* 17 29 08.7361829376 -16 32 43.144479564           ~ 1 0
8 2MASS J17291459-1650085 RG* 17 29 14.5852942776 -16 50 08.550002760           ~ 5 0
9 2MASS J17291621-1647189 RG* 17 29 16.2056264568 -16 47 18.918136608           ~ 1 0
10 2MASS J17291994-1618302 RG* 17 29 19.9426464312 -16 18 30.237496920           ~ 1 0
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63 2MASS J17321117-1654590 RG* 17 32 11.1748779864 -16 54 59.046672780           ~ 1 0
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70 2MASS J17323959-1625298 RG* 17 32 39.5923356360 -16 25 29.787374136           ~ 1 0
71 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
72 2MASS J17594241-3718247 RG* 17 59 42.4175072592 -37 18 24.754520124           ~ 1 0
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181 2MASS J18111553-3628156 RG* 18 11 15.5276237736 -36 28 15.582096660           ~ 1 0
182 2MASS J18111579-3625114 RG* 18 11 15.7921900224 -36 25 11.401980204           ~ 1 0
183 2MASS J18111581-3648469 RG* 18 11 15.8033342304 -36 48 46.932237072           ~ 1 0
184 2MASS J18111681-3636318 RG* 18 11 16.8056877600 -36 36 31.818943080           ~ 1 0
185 2MASS J18111726-3620302 RG* 18 11 17.2636408464 -36 20 30.253345044           ~ 1 0
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187 2MASS J18112311-3625456 RG* 18 11 23.1124496304 -36 25 45.620294412           ~ 1 0
188 2MASS J18112334-3634194 RG* 18 11 23.3364158064 -36 34 19.454052900           ~ 1 0
189 2MASS J18113299-3623341 RG* 18 11 33.0005901264 -36 23 34.125782388           ~ 1 0
190 2MASS J18113372-3650200 RG* 18 11 33.7338488280 -36 50 20.112309060           ~ 1 0
191 2MASS J18113751-3629139 RG* 18 11 37.5062794968 -36 29 13.965281376           ~ 1 0
192 2MASS J18113833-3626322 RG* 18 11 38.3323483128 -36 26 32.193290256           ~ 1 0
193 2MASS J18113921-3652069 RG* 18 11 39.216 -36 52 06.93           ~ 1 0
194 2MASS J18113965-3645408 RG* 18 11 39.6619738296 -36 45 40.841087688           ~ 1 0
195 2MASS J18114648-3625169 RG* 18 11 46.4811727859 -36 25 17.066899747           ~ 1 0
196 2MASS J18115073-3650493 RG* 18 11 50.7362585328 -36 50 49.380785376           ~ 1 0
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198 2MASS J18115448-3641161 RG* 18 11 54.4879953120 -36 41 16.167320376           ~ 1 0
199 2MASS J18115661-3617533 RG* 18 11 56.6117071392 -36 17 53.364178824           ~ 1 0
200 2MASS J18115904-3650428 RG* 18 11 59.0444264136 -36 50 42.877435848           ~ 1 0
201 2MASS J18115908-3654510 RG* 18 11 59.0883615000 -36 54 51.068756088           ~ 1 0
202 2MASS J18120213-3641599 RG* 18 12 02.1423886920 -36 42 00.036652968           ~ 1 0
203 2MASS J18120399-3615387 RG* 18 12 03.9964686096 -36 15 38.792169108           ~ 1 0
204 2MASS J18120407-3636481 RG* 18 12 04.0758680304 -36 36 48.119799744           ~ 1 0
205 2MASS J18120614-3629571 RG* 18 12 06.143 -36 29 57.17           ~ 1 0
206 2MASS J18120653-3654264 RG* 18 12 06.5364686568 -36 54 26.348302692           ~ 1 0
207 2MASS J18120689-3643231 RG* 18 12 06.8937785952 -36 43 23.207561220           ~ 1 0
208 2MASS J18120832-3628243 RG* 18 12 08.3259726288 -36 28 24.348898992           ~ 1 0
209 2MASS J18120973-3654184 RG* 18 12 09.7351638360 -36 54 18.465833664           ~ 1 0
210 2MASS J18121077-3639094 RG* 18 12 10.7782751808 -36 39 09.507380940           ~ 1 0
211 2MASS J18121150-3627559 RG* 18 12 11.5068668280 -36 27 55.908595404           ~ 1 0
212 2MASS J18121436-3654551 RG* 18 12 14.3695767072 -36 54 55.122897132           ~ 1 0
213 2MASS J18121897-3630243 RG* 18 12 18.9798469992 -36 30 24.245714952           ~ 1 0
214 2MASS J18122029-3652333 RG* 18 12 20.3023612848 -36 52 33.369516948           ~ 1 0
215 2MASS J18122243-3637539 RG* 18 12 22.4338499088 -36 37 53.989580928           ~ 1 0
216 2MASS J18122301-3629462 RG* 18 12 23.0182704312 -36 29 46.177309824           ~ 1 0
217 2MASS J18122530-3637366 RG* 18 12 25.3055136744 -36 37 36.659585388           ~ 1 0
218 2MASS J18122552-3653049 RG* 18 12 25.5274807560 -36 53 05.017593408           ~ 1 0
219 2MASS J18123142-3639294 RG* 18 12 31.4258948712 -36 39 29.506472352           ~ 1 0
220 2MASS J18123152-3636498 RG* 18 12 31.5244472904 -36 36 49.935251736           ~ 1 0
221 2MASS J18123168-3631555 RG* 18 12 31.6897703712 -36 31 55.542156132           ~ 1 0
222 2MASS J18123350-3654398 RG* 18 12 33.5143493328 -36 54 39.859248708           ~ 1 0
223 2MASS J18123393-3615508 RG* 18 12 33.9442837440 -36 15 50.942998404           ~ 1 0
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225 2MASS J18123475-3624478 RG* 18 12 34.7538211752 -36 24 47.806042536           ~ 1 0
226 2MASS J18123592-3634476 RG* 18 12 35.9308738440 -36 34 47.644247352           ~ 1 0
227 2MASS J18123678-3649019 RG* 18 12 36.7858558152 -36 49 01.938785988           ~ 1 0
228 2MASS J18123925-3620465 RG* 18 12 39.2604377976 -36 20 46.540109040           ~ 1 0
229 2MASS J18124219-3631172 RG* 18 12 42.2010142680 -36 31 17.180823108           ~ 1 0
230 2MASS J18124228-3655079 RG* 18 12 42.2956769136 -36 55 08.026903128           ~ 1 0
231 2MASS J18124339-3635339 RG* 18 12 43.3971055560 -36 35 33.950205744           ~ 1 0
232 2MASS J18124614-3617326 RG* 18 12 46.1367630840 -36 17 32.676430272           ~ 1 0
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237 2MASS J18125463-3649277 RG* 18 12 54.6357627864 -36 49 27.717281292           ~ 1 0
238 2MASS J18125800-3616427 RG* 18 12 58.0034836344 -36 16 42.773733516           ~ 1 0
239 2MASS J18125907-3644275 RG* 18 12 59.0724636888 -36 44 27.558532176           ~ 1 0
240 2MASS J18125914-3619208 RG* 18 12 59.1397757328 -36 19 20.874453744           ~ 1 0
241 2MASS J18130427-3630012 RG* 18 13 04.2808117320 -36 30 01.206398232           ~ 1 0
242 2MASS J18130482-3649019 RG* 18 13 04.8256175856 -36 49 01.995830688           ~ 1 0
243 2MASS J18130544-3616563 RG* 18 13 05.4398037000 -36 16 56.320204980           ~ 1 0
244 2MASS J18130723-3618385 RG* 18 13 07.2309564960 -36 18 38.474244648           ~ 1 0
245 2MASS J18130815-3631460 RG* 18 13 08.1485124696 -36 31 45.989410224           ~ 1 0
246 2MASS J18131027-3632343 RG* 18 13 10.2711720336 -36 32 34.331990532           ~ 1 0
247 2MASS J18131228-3619138 RG* 18 13 12.2835986496 -36 19 13.911719376           ~ 1 0
248 2MASS J18131305-3650449 RG* 18 13 13.0540533840 -36 50 45.024708480           ~ 1 0
249 2MASS J18131370-3651584 RG* 18 13 13.7089082064 -36 51 58.498965216           ~ 1 0
250 2MASS J18131387-3630130 RG* 18 13 13.8803537976 -36 30 13.025222496           ~ 1 0
251 2MASS J18132040-3623075 RG* 18 13 20.4030045768 -36 23 07.539460584           ~ 1 0
252 2MASS J18132998-3628578 RG* 18 13 29.9848753080 -36 28 57.794460384           ~ 1 0
253 2MASS J18133038-3632229 RG* 18 13 30.3874473840 -36 32 22.911455256           ~ 1 0
254 2MASS J18133233-3626133 RG* 18 13 32.3355193968 -36 26 13.326344772           ~ 1 0
255 2MASS J18133292-3624179 RG* 18 13 32.9295777336 -36 24 18.004496148           ~ 1 0
256 2MASS J18133332-3645578 RG* 18 13 33.3306487656 -36 45 57.754796256           ~ 1 0
257 2MASS J18133366-3644575 RG* 18 13 33.6754888872 -36 44 57.491679588           ~ 1 0
258 2MASS J18133687-3639590 RG* 18 13 36.8708501928 -36 39 59.006518272           ~ 1 0
259 2MASS J18133688-3647054 RG* 18 13 36.8882559768 -36 47 05.383842900           ~ 1 0
260 2MASS J18134668-3623541 RG* 18 13 46.6930445640 -36 23 54.136627548           ~ 1 0
261 2MASS J18134702-3641477 RG* 18 13 47.0220874344 -36 41 47.794129476           ~ 1 0
262 2MASS J18135164-3643463 RG* 18 13 51.6405709776 -36 43 46.344096660           ~ 1 0
263 2MASS J18135243-3630481 RG* 18 13 52.4353629000 -36 30 48.132122904           ~ 1 0
264 2MASS J18135362-3636538 RG* 18 13 53.6277516096 -36 36 53.848642536           ~ 1 0
265 2MASS J18135588-3629188 RG* 18 13 55.8834055320 -36 29 18.874492944           ~ 1 0
266 2MASS J18135736-3638266 RG* 18 13 57.3691427616 -36 38 26.621460456           ~ 1 0
267 2MASS J18135786-3640300 RG* 18 13 57.8714477928 -36 40 29.984588580           ~ 1 0
268 2MASS J18135881-3639345 RG* 18 13 58.8175121832 -36 39 34.494547212           ~ 1 0
269 2MASS J18140023-3635461 RG* 18 14 00.2345824536 -36 35 46.063394160           ~ 1 0
270 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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