1999A&A...347...69R


Query : 1999A&A...347...69R

1999A&A...347...69R - Astronomy and Astrophysics, volume 347, 69-76 (1999/7-1)

Early-type stars in the Galactic halo from the Palomar-Green Survey. II: A sample of distant, apparently young Population I stars.

ROLLESTON W.R.J., HAMBLY N.C., KEENAN F.P., DUFTON P.L. and SAFFER R.A.

Abstract (from CDS):

We present echelle (R∼40000) spectroscopic observations for a sample of apparently normal, high Galactic latitude, early-type stars drawn from the Palomar-Green Survey. The metal-line spectra show evidence for rotational velocity broadening with values of vsin i≤300km/s. In conjunction with Kurucz model atmospheres, we derive stellar photospheric abundances that are consistent with a Population i chemical composition; differential abundances with respect to Galactic disk Population i stars indicate no abundance differences outside the estimated errors. From a comparison of the derived atmospheric parameters with recent theoretical evolutionary models, we derive distance and age estimates for individual stars. Using kinematical considerations, we conclude that all these objects are `runaway' stars, formed in the Galactic disk and subsequently ejected, possibly by supernovae explosions or dynamical interactions.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: atmospheres - stars: early-type - stars: kinematics

VizieR on-line data: <Available at CDS (J/A+A/347/69): table4.dat table5.dat>

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * zet Scl SB* 00 02 19.9270625208 -29 43 13.588516668 4.29 4.879 5.022     B5IV 129 0
2 Cl Blanco 1 OpC 00 03 25 -29 57.5           ~ 276 0
3 PG 0009+036 HS* 00 12 27.7619262528 +03 54 31.746121920   13.06 13.13 13.42   sdB2VIIpHe4 31 0
4 * 20 Tau PM* 03 45 49.6065620 +24 22 03.886360 3.40 3.80 3.87 3.85 3.90 B8III 417 1
5 PG 0832+676 HS* 08 37 34.7329769280 +67 24 13.597330788   13.87 14.12 14.47   sdOA 49 1
6 PG 0855+294 HB* 08 58 20.3368067712 +29 12 03.674683080   12.47 12.83 12.55   B 17 0
7 PG 0914+001 HS* 09 17 12.2423039232 -00 08 38.458978440   14.43 14.53 14.62   sdB 16 0
8 2MASS J09370390+1418216 HS* 09 37 03.9035209392 +14 18 21.617203644   13.23       sdB5IVHe7 12 0
9 PG 0955+291 HB* 09 58 15.2083660008 +28 52 32.672688924   12.90 12.98 13.19   B5 14 0
10 PG 1205+228 HB* 12 07 57.6660091944 +22 31 51.972316356   10.86 11.13     B4 31 0
11 HD 132955 * 15 02 59.2764966384 -32 38 35.849039748 4.69 5.319 5.437     B3V 89 0
12 * iot Her bC* 17 39 27.8860861 +46 00 22.800110 2.940 3.630 3.800     B3IV 438 1
13 PG 2219+094 HS* 22 21 59.1666812160 +09 37 25.744381788   11.78 12.06     sdB0.5VpHe7 31 0
14 PG 2229+099 HS* 22 32 08.7226033800 +10 14 25.113267780   13.19 13.28 13.42   sdB5IIIHe11 17 0
15 V* HN Aqr bC* 22 37 38.2846689672 -18 39 51.268772880   11.293 11.426 11.813   B 61 0
16 PG 2345+241 HS* 23 48 22.2890683848 +24 23 06.627581880   12.15 12.42     sdB3IVHe12 16 0

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2022.05.24-08:10:49

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