Query : 2016A&A...585A.141G

2016A&A...585A.141G - Astronomy and Astrophysics, volume 585A, 141-141 (2016/1-1)

A catalog of early-type stars toward the Galactic Center.


Abstract (from CDS):

It is still unclear whether the Sagittarius spiral arm is a major spiral arm in the Galaxy or whether it just outlines a region of enhanced star formation because of the local compression of gas. The best way to separate these scenarios out is to study the kinematics across the arm to determine the velocity perturbation it induces. A survey of early-type stars in the direction of the Galactic center is performed covering an area of 100 sq. deg with the aim of identifying candidates for a radial velocity study. Objective prism plates were obtained with the 4° prism on the ESO Schmidt telescope using IIaO, 4415, and IIIaJ emulsions. The plates were digitized and more than 100k spectra were extracted down to a limiting magnitude of B=15m. The spectra were cross-correlated with a template with Balmer lines, which yielded a candidate list of 12675 early-type stars. Magnitudes and equivalent widths of strong lines were calculated from the spectra, which allowed us to estimate the individual extinctions and distances for 11075 stars. The survey identified 9571 candidate stars with a spectral type earlier than A1 and B<14.5m out to distances of more than 2kpc, which is beyond the Sagittarius arm. This is indicated by the increase of absorption in the plane at distances larger than 0.5kpc.

Abstract Copyright:

Journal keyword(s): stars: early-type - dust, extinction - Galaxy: disk - Galaxy: stellar content - Galaxy: structure - surveys

VizieR on-line data: <Available at CDS (J/A+A/585/A141): ets_tgc.dat ets_tgc.fit>

Nomenclature: [G2016] OPS JHHMMSSs+DDMMSS N=12675.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Per Arm PoG 03 30 +45.0           ~ 1423 0
2 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13329 0
3 NAME Sgr Arm PoG 19 00 -30.0           ~ 604 1

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