2010AJ....139.1031O

Query : 2010AJ....139.1031O

2010AJ....139.1031O - Astron. J., 139, 1031-1044 (2010/March-0)

A search for field horizontal-branch stars near the South Galactic Pole.

ORTIZ R., WILHELM R., COSTA R.D.D., ROSSI S. and BEERS T.C.

Abstract (from CDS):

Searches for field horizontal-branch (FHB) stars in the halo of the Galaxy in the past have been carried out by several techniques, such as objective-prism surveys and visual or infrared photometric surveys. By choosing adequate color criteria, it is possible to improve the efficiency of identifying bona fide FHB stars among the other objects that exhibit similar characteristics, such as main-sequence A-stars, blue stragglers, subdwarfs, etc. In this work, we report the results of a spectroscopic survey carried out near the south Galactic pole intended to validate FHB stars originally selected from the HK objective-prism survey of Beers and colleagues, based on near-infrared color indices. A comparison between the stellar spectra obtained in this survey with theoretical stellar atmosphere models allows us to determine Teff, log g, and [Fe/H] for 13 stars in the sample. Stellar temperatures were calculated from measured (B - V)o, when this measurement was available (16 stars). The color index criteria adopted in this work are shown to correctly classify 30% of the sample as FHB, 25% as non-FHB (main-sequence stars and subdwarfes), whereas 40% could not be distinguished between FHB and main-sequence stars. We compare the efficacy of different color criteria in the literature intended to select FHB stars, and discuss the use of the Mg II 4481 line to estimate the metallicity.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: halo - Galaxy: stellar content - stars: early-type - stars: horizontal-branch - subdwarfs - surveys

Simbad objects: 49

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Number of rows : 49
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 HD 157 HB* 00 06 25.2362593536 -20 03 24.392457756   10.614 10.659 10.888   B9V 19 0
2 SB 42 HS? 00 07 27.7698395928 -21 22 27.819680880   12.56 12.98     BV 6 0
3 CD-39 17 * 00 08 45.8936396544 -39 16 52.176894024   11.51 11.55     BV 4 0
4 SB 99 * 00 15 29.4229580952 -21 05 49.774144164   12.16 12.42     A0 6 0
5 CD-42 120 * 00 26 41.9124136056 -41 50 51.084255876   11.48 11.28     AV 4 0
6 SB 189 HB* 00 28 42.7863103440 -18 23 50.152362180 12.029 12.14 12.32     BV 9 0
7 SB 258 HB* 00 38 31.8111174960 -39 13 18.316414884     13.0     A0 4 0
8 BPS CS 22183-0010 HB* 00 50 29.0398578648 -03 07 11.138895516 14.00 13.83 13.74     A1.5 6 0
9 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 606 0
10 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
11 SB 359 HB* 00 53 30.2962621320 -14 26 34.121466996   12.69 12.70     A0 6 0
12 BD+00 145 PM* 00 56 27.0390816312 +01 43 42.749482188   10.587 10.485 10.673   AV 26 0
13 BD+01 169 s*b 00 56 46.2377362536 +01 57 19.450103904   10.32 10.35     B5Ib 10 0
14 BPS CS 22183-0012 HB* 00 57 01.2550906056 -03 16 57.238273344 13.314 13.393 13.40     B8.0 5 0
15 HD 5744 HB* 00 58 58.2130857624 -05 24 31.918499928   10.58 10.61     B9.5III 17 0
16 BPS CS 22174-0005 HB* 01 13 43.6159397952 -11 16 32.229808500   13.86 13.88     A/BV 4 0
17 HD 8269 HB* 01 21 47.6906265144 -15 03 04.221076932   10.337 10.35     B9V 12 0
18 TYC 4682-2701-1 * 01 29 09.5407436640 -03 12 31.195348344   11.46 11.59     AV 4 0
19 Feige 13 HB* 01 30 19.8165466704 -09 44 56.137119468 12.45 12.35 12.40     A/BV 12 0
20 TYC 4687-1086-1 * 01 35 16.5756934680 -04 54 07.662907080   11.62 11.36     ~ 2 0
21 PHL 1342 HS? 02 32 47.7978366000 -20 38 43.076275224   13.4 13.6     B 4 0
22 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
23 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
24 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
25 Ton S 61 HS* 22 36 16.6338641856 -31 42 13.008803472   12.905 13.145 13.463   sdO 18 0
26 PHL 5365 HB? 22 38 30.8600755488 -28 27 19.735691724   13.5       B9 3 0
27 [PS72] 57 HB* 22 38 34.0607706864 -30 17 32.004448224   12.8       B9w 3 0
28 TYC 7511-629-1 HS? 22 48 01.8940777152 -35 03 10.542513024   12.33 12.29     ~ 4 0
29 2MASS J22501122-3759588 HB? 22 50 11.2172176008 -37 59 58.877851488           ABV 3 0
30 KK 345-140 * 22 50.3 -38 01     14.05     A5 3 0
31 GD 1625 HB* 23 08 13.2096283440 -27 06 43.741893240   11.98 11.89     B9 7 0
32 2MASS J23105132-2308308 HB? 23 10 51.3343070832 -23 08 30.810494508           AV 2 0
33 GD 1637 HB* 23 14 00.8158811016 -29 43 46.791148188   13.5       A0 5 0
34 [PS72] 116 HB* 23 16 28.3046973720 -28 06 31.544252064   12.8       A0 3 0
35 PHL 5593 * 23 17 11.9298385008 -26 54 11.780441496   12.44 11.79     A0V 4 0
36 TYC 6979-613-1 HB? 23 19 14.2934896296 -27 56 15.118470276   12.97 12.85     AV 4 0
37 2MASS J23225187-3047375 * 23 22 51.8746344672 -30 47 37.675501152           ~ 2 0
38 CD-32 17525 * 23 26 23.5081128480 -32 03 00.396348336   11.26 10.88     AV 3 0
39 2MASS J23270592-4009350 HB* 23 27 05.9320331448 -40 09 35.085596292           ~ 3 0
40 2MASS J23281220-2717129 HB? 23 28 12.2162549352 -27 17 13.050588912           BV 2 0
41 GD 1664 HB* 23 30 11.6840343528 -26 43 07.343874156   12.74 13.12     A0 7 0
42 BPS CS 22941-0018 HB* 23 31 18.9457242936 -34 35 41.751909600   13.18 13.19     ~ 5 0
43 GD 1678 HB? 23 37 08.8078549896 -26 14 00.083188284 12.34 11.81 11.67     AV 9 0
44 SB 816 HB* 23 44 29.1989794440 -28 19 22.865592540   13.19 13.15     A0 8 0
45 CD-37 15373 HB* 23 46 45.0696070920 -36 20 14.365410252 12.260 12.478 12.53     A0 4 0
46 BD-17 6820 HS* 23 48 09.8198284464 -16 58 54.603224148   11.53 11.51     sdB 6 0
47 BD-14 6562 * 23 51 14.5492632960 -13 22 30.399852324   11.14 10.82   10.724 AV 9 0
48 CD-33 16735 HB* 23 52 15.6594709176 -32 37 00.767167464 12.50 12.48 12.42     AV 6 0
49 TYC 5259-557-1 * 23 54 52.3102614360 -06 08 50.838434988   12.65 12.16     AV 3 0

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