2011A&A...536A.101C


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET00:11:43

2011A&A...536A.101C - Astronomy and Astrophysics, volume 536A, 101-101 (2011/12-1)

Photometric distances to young stars in the inner Galactic disk. I. The L = 314° direction.

CARRARO G.

Abstract (from CDS):

The spiral structure of the Milky Way is nowadays receiving renewed attention thanks to the combined efforts of observational campaigns in different wavelength regimes from the optical to the radio. We start in the paper exploration of several key sectors (line of sights) in the inner Milky Way, where the spiral structure is still poorly known. We searched for density enhancements of young stars that might plausibly be associated with spiral structure. To this aim we collected sufficiently wide-field UBVI photometry to allow us to probe in a statistical sense the distribution in reddening and distance of young stars in the field. Although heavily demanding in terms of observational efforts, the intensive usage of U-band photometry ensures robust determination of reddening, hence distance for stars with earlier than A0 spectral type, which are well-known spiral arm tracers, even though no spectroscopic information are available. The fields we use are large enough to include in most cases well-studied Galactic clusters, which we use as benchmarks to assess the quality and standardization of the data and to validate our method. We focus on the line of sight to the Galactic longitude l=314°, where previous surveys have already detected Hα emitters at different standard-of-rest velocities, hence distances. The difficulty, however, to translate velocity into distance make predictions on the spiral structure quite vague. First of all, we made exhaustive tests to show that our dataset is in the standard system, and calibrated our method using the two open clusters NGC 5617 and Pismis 19, which happen to be in the field and for which we found estimates of the basic parameters in full agreement with the literature. We then applied the method to the general field stars and detected signatures of three different groups of stars, evenly distributed across the field of view, at 1.5+0.5–0.2, 2.5+0.3–0.5, and 5.1+1.5–1.1kpc. These distances are compatible with the location of the nowadays commonly accepted description of the Carina-Sagittarius and Scutum-Crux arms, at heliocentric distance of ∼2 an 5kpc, respectively. As a consequence, we consider these groups to be good candidates for tracing the location of these two inner arms. In line with previous studies, this investigation demonstrates once again how powerful is to use of U-band photometry to characterize ensembles of young stars, and make predictions on the spiral structure of the Milky Way.

Abstract Copyright:

Journal keyword(s): open clusters and associations: general - stars: early-type - Galaxy: disk

VizieR on-line data: <Available at CDS (J/A+A/536/A101): table2.dat>

Nomenclature: Table 2 : [C2011b] NNNN (Nos 1-3003) N=3003

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

Simbad objects: 28

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Number of rows : 28

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 952 2
2 NAME Per Arm PoG 03 30 +45.0           ~ 1290 0
3 NAME Car Arm PoG 10 00 -60.0           ~ 385 1
4 NAME Shorlin 1 OpC 11 06 19 -61 14.6           ~ 13 0
5 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 283 0
6 Cl Danks 1 OpC 13 12 27 -62 42.1           ~ 62 0
7 Cl Danks 2 OpC 13 12 55 -62 40.9           ~ 57 0
8 Cl Stock 16 OpC 13 19 29 -62 38.0           ~ 85 0
9 PG 1323-086 HS* 13 25 39.4670509324 -08 49 19.068159971 12.660 13.341 13.481 13.529 13.608 sdB3IHe8 136 1
10 Cl Lynga 1 OpC 14 00 02 -62 09.0           ~ 44 0
11 RCW 83 HII 14 08.7 -62 04           ~ 6 0
12 RCW 85 HII 14 20.7 -61 24           ~ 15 1
13 Cl Lynga 2 OpC 14 24 21.10 -61 19 21.0   6.65 6.4     ~ 51 0
14 NGC 5606 OpC 14 27 47 -59 38.4           ~ 92 0
15 NGC 5617 OpC 14 29 44 -60 42.7   7.00 6.3     ~ 85 0
16 Cl Pismis 19 OpC 14 30 36 -60 53.1           ~ 26 0
17 Cl Trumpler 22 OpC 14 31.0 -61 10   8.48 7.9     ~ 48 0
18 Cl Hogg 17 OpC 14 34 00 -61 20.8   8.87 8.3     ~ 29 0
19 NGC 5716 EmG 14 41 05.515 -17 28 36.91   13.0   16.43 12.6 ~ 27 0
20 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 440 1
21 PG 1657+078 HS* 16 59 32.2152633688 +07 43 31.413989790 13.919 14.877 15.019 15.098 15.115 sdB 51 0
22 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11996 0
23 SA 110- reg 18 45 +00.6           ~ 95 0
24 [L92b] Mark A HS* 20 43 59.2255386146 -10 47 41.693629843 11.854 13.010 13.256 13.370 13.494 sdO 68 1
25 NAME Outer Arm PoG 21 48 +69.4           ~ 230 0
26 NAME Local Arm reg ~ ~           ~ 394 0
27 NAME Ori Arm PoG ~ ~           ~ 181 0
28 NAME Norma-Cygnus Arm reg ~ ~           ~ 76 0

    Equat.    Gal    SGal    Ecl

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2021.02.27-00:11:43

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