2007AJ....134.1183O

Query : 2007AJ....134.1183O

2007AJ....134.1183O - Astron. J., 134, 1183-1194 (2007/September-0)

A survey of early-type stars based on the Two Micron All Sky Survey database.

ORTIZ R., MALACARNE M., WILHELM R., COSTA R.D.D., ROSSI S., MACIEL W.J. and COSTA A.F.M.

Abstract (from CDS):

We report the results of a spectroscopic survey of blue stars near the south Galactic pole, selected according to their color indices in the 2MASS database. The main scope of this work is to determine the nature of the objects that comprise the sample. Some characteristics of the Hβ, Hγ, and Hδ lines which are sensitive to temperature and gravity were measured and eventually compared with a grid of model atmospheres to obtain Teff and logg. In some cases the data allowed a unique, reliable classification of the star. Among the 44 stars studied, 5 objects are reliably classified as subdwarfs, 12 as A-type stars, and 3 as field horizontal-branch (FHB) stars. The remaining objects are either A or FHB stars, but additional observations are necessary to distinguish between these two types. Neither degenerate nor low-gravity stars (post-AGB) have been identified in the sample.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Halo - Galaxy: Stellar Content - Stars: Early-Type - Stars: Horizontal-Branch - Stars: Subdwarfs - Surveys

Nomenclature: Table 1: [OMW2007] NN (Nos 1-44).

Simbad objects: 45

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Number of rows : 45
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 SB 99 * 00 15 29.4229580952 -21 05 49.774144164   12.16 12.42     A0 6 0
2 SB 189 HB* 00 28 42.7863103440 -18 23 50.152362180 12.029 12.14 12.32     BV 9 0
3 SB 190 * 00 28 48.4280047344 -36 32 02.495809824   13.7 13.6     A0 2 0
4 2MASS J00335405-4547026 HB* 00 33 54.0658916808 -45 47 02.707005408   14.5 14.4     ~ 3 0
5 SB 258 HB* 00 38 31.8111174960 -39 13 18.316414884     13.0     A0 4 0
6 2MASS J00471767-1453172 * 00 47 17.6766571104 -14 53 17.247376716           ~ 2 0
7 TYC 7538-367-1 * 00 48 06.3108620928 -44 39 56.495142324   12.50 12.82     ~ 1 0
8 NAME SGP reg 00 51 26.275 -27 07 41.70           ~ 606 0
9 Ton S 183 HS* 01 01 17.5722745104 -33 42 45.434983572   12.39 14.631 12.95   sdB 53 0
10 CD-33 421 * 01 09 04.1177685408 -33 07 40.324475424   11.91 12.03 12.18   B3V 18 0
11 SB 480 * 01 11 16.9705697112 -21 38 54.249385704   13.14 13.14     A0 25 0
12 TYC 8032-315-1 * 01 14 23.7823495512 -47 10 40.381585644   12.47 12.60     ~ 1 0
13 CD-40 359 * 01 29 40.1018103144 -40 15 53.895559248 11.865 11.70 11.577     A3 5 0
14 TYC 5855-1018-1 * 01 51 11.9044126152 -17 32 51.901328544   11.69 11.46     ~ 2 0
15 2MASS J02165824-3447583 * 02 16 58.2487352976 -34 47 58.239637188           ~ 1 0
16 2MASS J02192738-3637583 * 02 19 27.3797944152 -36 37 58.369641276           ~ 2 0
17 HE 0218-3437 V* 02 20 59.7691316472 -34 23 35.317169052     13.39     ~ 12 0
18 EC 02200-2338 HS* 02 22 19.8375036240 -23 24 55.937378952   11.79 12.01     sdB 17 0
19 2MASS J02251836-2433280 * 02 25 18.3604014768 -24 33 28.036347588           ~ 2 0
20 TYC 7552-274-1 HS? 02 27 29.1790546800 -39 53 37.783215420   11.84 12.09     ~ 3 0
21 PHL 1342 HS? 02 32 47.7978366000 -20 38 43.076275224   13.4 13.6     B 4 0
22 2MASS J02344423-2108454 * 02 34 44.2389639192 -21 08 45.218288184           ~ 2 0
23 BD-15 495 * 02 48 48.0690564768 -15 00 52.511627556   11.04 11.23     ~ 1 0
24 2MASS J02560556-3555579 * 02 56 05.5754647944 -35 55 57.982737720           ~ 1 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 2018 HS? 22 38 54.2170863600 -23 52 20.921305260   11.59 11.96     ~ 8 0
27 PHL 5382 PM* 22 39 37.6353569088 -24 55 02.554396032   12.3 12.51     ~ 5 0
28 2MASS J22475352-3829408 * 22 47 53.5266084168 -38 29 40.804912284           ~ 1 0
29 TYC 7511-629-1 HS? 22 48 01.8940777152 -35 03 10.542513024   12.33 12.29     ~ 4 0
30 2MASS J22501122-3759588 HB? 22 50 11.2172176008 -37 59 58.877851488           ABV 3 0
31 2MASS J22515349-4355577 * 22 51 53.5027806672 -43 55 57.753850188           ~ 2 0
32 TYC 6393-664-1 * 22 52 45.2431278144 -21 47 47.635796904   12.11 12.39     ~ 1 0
33 TYC 6393-934-1 * 22 53 31.1220693504 -20 05 01.774174740   11.09 10.86     ~ 4 0
34 TYC 6397-905-1 * 22 57 47.8070975232 -18 22 56.867829492   11.83 11.92     ~ 1 0
35 TYC 7508-16-1 * 22 57 53.2090634712 -32 50 52.858154940   12.23 12.55     ~ 2 0
36 TYC 6397-1359-1 * 23 01 03.1092090672 -18 05 33.995924340   11.41 11.37     ~ 1 0
37 2MASS J23071216-3157380 * 23 07 12.1718557704 -31 57 37.964745720           ~ 2 0
38 CD-42 16211 * 23 09 15.6791217144 -41 23 10.541907600   11.39 11.27     ~ 1 0
39 LB 1521 * 23 22 31.4567965464 -45 59 46.340554452   12.06 12.30     ~ 4 0
40 2MASS J23270592-4009350 HB* 23 27 05.9320331448 -40 09 35.085596292           ~ 3 0
41 2MASS J23285991-1437024 * 23 28 59.9113160760 -14 37 02.476454700           ~ 2 0
42 TYC 8014-689-1 * 23 33 47.3640879384 -38 53 28.076137764   11.57 11.51     ~ 1 0
43 SB 827 * 23 46 28.2455716776 -34 55 59.098676376   14.30 14.27     A 7 0
44 SB 883 * 23 52 19.5120424560 -36 03 51.637563504   14.07 14.04     A0 7 0
45 TYC 8021-654-1 PM* 23 59 10.1460729744 -43 42 30.558846528   12.17 12.30     ~ 3 0

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