2001A&A...378..907R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST15:11:43

2001A&A...378..907R - Astronomy and Astrophysics, volume 378, 907-917 (2001/11-2)

Early type stars at high galactic latitudes. I. Ten young massive B-type stars.

RAMSPECK M., HEBER U. and MOEHLER S.

Abstract (from CDS):

We present the results of quantitative spectral analyses of ten apparently normal B-type stars. These stars were found to be young massive B-type stars at distances of z=2.6 to 7.6kpc from the galactic plane based on their positions in the (Teff, logg) diagram, normal abundance patterns and/or large projected rotational velocities. We discuss formation scenarios (runaway star scenarios versus a scenario for star formation in the halo) by comparing times-of-flight and evolutionary time scales. For all stars (except SB 357 and HS 1914+7139) both the scales are similar indicating that the stars could have formed in the galactic disk and been ejected from there soon after their birth. Derived ejection velocities range from 130km/s to 440km/s and may be used to constrain models for ejection mechanisms. Using new proper motion measurements we show that PHL 346, which was considered the most likely candidate for a young B-type star born in the halo, can be explained as a runaway star from the galactic plane.

Abstract Copyright:

Journal keyword(s): Galaxy: halo - stars: early-type - stars: abundances - stars: kinematics - stars: evolution

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PG 0009+036 HS* 00 12 27.7615239591 +03 54 31.744077051   13.06 13.13 13.42   sdB2VIIpHe4 29 0
2 BD-15 115 * 00 38 20.2597592652 -14 59 54.164857485 9.848 10.686 10.885 10.980 11.089 B2 50 0
3 CD-37 316 Be* 00 53 01.6835345046 -36 20 20.686616662   12.30 12.39 12.75   B2p(e) 24 0
4 PG 0122+214 * 01 25 29.5981965945 +21 36 30.682732901   12.60 13.34     sd 17 0
5 PG 0832+676 HS* 08 37 34.7328211400 +67 24 13.594597809   13.87 14.12 14.47   sdOA 48 1
6 PG 1501+664 WD* 15 02 09.6296551839 +66 12 19.146114550   16.07 16.37     DZQ1 149 0
7 PG 1511+367 HB* 15 13 22.4542385637 +36 28 22.968698564   12.04 12.63     B2 13 0
8 PG 1533+467 * 15 34 42.6023131997 +46 31 47.901609548   10.66 10.78     sd 12 0
9 LB 9514 WD* 16 13 01.5329521515 +23 48 30.812862029   12.70 14.67 16.14   DB4 25 0
10 HS 1914+7139 * 19 14 10.0915266502 +71 44 39.979489146     14.5     B2.5IV 11 0
11 PHL 159 * 21 48 44.2701173420 +01 57 33.824984124   10.67 10.84     ~ 13 0
12 PG 2219+094 HS* 22 21 59.1664271264 +09 37 25.733927625   11.78 12.06     sdB0.5VpHe7 29 0
13 V* HN Aqr bC* 22 37 38.2846197264 -18 39 51.268673991   11.28 11.47     B 58 0

    Equat.    Gal    SGal    Ecl

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2020.07.16-15:11:43

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