2013A&A...560A..71C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST07:19:02

2013A&A...560A..71C - Astronomy and Astrophysics, volume 560A, 71-71 (2013/12-1)

TOPoS. I. Survey design and analysis of the first sample.

CAFFAU E., BONIFACIO P., SBORDONE L., FRANCOIS P., MONACO L., SPITE M., PLEZ B., CAYREL R., CHRISTLIEB N., CLARK P., GLOVER S., KLESSEN R., KOCH A., LUDWIG H.-G., SPITE F., STEFFEN M. and ZAGGIA S.

Abstract (from CDS):

The metal-weak tail of the metallicity distribution function (MDF) of the Galactic Halo stars contains crucial information on the formation mode of the first generation of stars. To determine this observationally, it is necessary to observe large numbers of extremely metal-poor stars. We present here the Turn-Off Primordial Stars survey (TOPoS) that is conducted as an ESO Large Programme at the VLT. This project has four main goals: (i) to understand the formation of low-mass stars in a low-metallicity gas: determine the metal-weak tail of the halo MDF below [M/H]=-3.5; in particular, we aim at determining the critical metallicity, that is the lowest metallicity sufficient for the formation of low-mass stars; (ii) to determine in extremely metal-poor stars the relative abundances of the elements that are the signature of the massive first stars; (iii) to determine the trend of the lithium abundance at the time when the Galaxy formed; and (iv) to derive the fraction of C-enhanced extremely metal-poor stars with respect to normal extremely metal-poor stars. The large number of stars observed in the SDSS provides a good sample of candidate stars at extremely low metallicity. Candidates with turn-off colours down to magnitude g=20 were selected from the low-resolution spectra of SDSS by means of an automated procedure. X-Shooter has the potential of performing the necessary follow-up spectroscopy, providing accurate metallicities and abundance ratios for several key elements for these stars. We present here the stellar parameters of the first set of stars. The nineteen stars range in iron abundance between -4.1 and -2.9dex relative to the Sun. Two stars have a high radial velocity and, according to our estimate of their kinematics, appear to be marginally bound to the Galaxy and are possibly accreted from another galaxy.

Abstract Copyright:

Journal keyword(s): stars: Population II - stars: abundances - Galaxy: abundances - galaxies: formation - Galaxy: halo

Simbad objects: 25

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Number of rows : 25

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 SDSS J000411.61-055027.7 Pe* 00 04 11.6078604941 -05 50 27.668598455           ~ 2 0
2 SB 44 SB* 00 07 37.5160975025 -35 31 17.710203728   13.23 12.76 12.76   sdF 75 0
3 2MASS J00255862-1015097 Pe* 00 25 58.6035893287 -10 15 09.473266849           ~ 2 0
4 CD-38 245 Pe* 00 46 36.1954714218 -37 39 33.555736375   12.733 11.929 13.39 10.996 KIIvw 201 0
5 SDSS J014036.21+234458.1 Pe* 01 40 36.2206962306 +23 44 58.204189219   15.6       CEMP-no 32 0
6 SDSS J014828.99+150221.5 Pe* 01 48 28.9916116269 +15 02 21.526035466           ~ 2 0
7 SDSS J031348.14+011456.4 Pe* 03 13 48.1469335141 +01 14 56.451318998           ~ 2 0
8 HE 0311-1046 Pe* 03 14 20.8495240680 -10 35 11.279671787   13.54 12.73 12.204 11.693 KIIvw 64 0
9 SDSS J040114.71-051259.0 Pe* 04 01 14.7139182856 -05 12 59.008323585           ~ 3 0
10 UCAC3 215-112497 Pe* 10 29 15.1491308300 +17 29 27.926665478         15.98 ~ 91 0
11 2MASS J10500235+2421098 Pe* 10 50 02.3410177455 +24 21 09.765600141           ~ 3 0
12 SDSS J112750.90-072711.5 Pe* 11 27 50.9081831998 -07 27 11.477675097           ~ 2 0
13 SDSS J124121.48-021228.6 Pe* 12 41 21.4838345549 -02 12 28.541763169           ~ 2 0
14 SDSS J124304.19-081230.6 Pe* 12 43 04.2118154959 -08 12 30.600555874           ~ 2 0
15 SDSS J124719.46-034152.4 Pe* 12 47 19.4674156535 -03 41 52.504633659           ~ 5 0
16 BPS BS 16467-0062 Pe* 13 42 00.6325668250 +17 48 40.825137829   14.69 14.09 13.665 13.216 ~ 46 0
17 SDSS J150702.02+005152.6 Pe* 15 07 02.0207720653 +00 51 52.615391315           ~ 5 0
18 SDSS J172552.20+274116.6 Pe* 17 25 52.2080088604 +27 41 16.667648864           ~ 2 0
19 BPS CS 22885-0096 Pe* 20 20 51.1729562140 -39 53 30.235406812   14.02 13.33     CEMP-no 82 0
20 SDSS J214633.18-003910.2 Pe* 21 46 33.1835109483 -00 39 10.239600928           ~ 4 0
21 SDSS J220121.77+010055.6 Pe* 22 01 21.7682900509 +01 00 55.603569666           ~ 2 0
22 SDSS J222130.22+000617.0 Pe* 22 21 30.2323913338 +00 06 17.128093484           ~ 2 0
23 SDSS J225429.61+062728.2 Pe* 22 54 29.6148784445 +06 27 28.332233101           ~ 2 0
24 SDSS J230243.33-094346.0 Pe* 23 02 43.3365804835 -09 43 46.036272769           ~ 2 0
25 SDSS J235210.23+140140.2 Pe* 23 52 10.2357581826 +14 01 40.253940819           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.07.09-07:19:02

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