2012A&A...537L...4M


Query : 2012A&A...537L...4M

2012A&A...537L...4M - Astronomy and Astrophysics, volume 537, L4-4 (2012/1-1)

Strengthening the open cluster distance scale via VVV photometry.

MAJAESS D., TURNER D., MONI BIDIN C., GEISLER D., BORISSOVA J., MINNITI D., BONATTO C., GIEREN W., CARRARO G., KURTEV R., MAURO F., CHENE A.-N., FORBES D., LUCAS P., DEKANY I., SAITO R.K. and SOTO M.

Abstract (from CDS):

Approximately 14% of known Galactic open clusters possess absolute errors ≤20% as evaluated from n≥3 independent distance estimates, and the statistics for age estimates are markedly worse. That impedes such diverse efforts as calibrating standard candles and constraining masses for substellar companions. New data from the VVV survey may be employed to establish precise cluster distances with comparatively reduced uncertainties (≤10%). This is illustrated by deriving parameters for Pismis 19 and NGC 4349, two pertinent open clusters which hitherto feature sizable uncertainties (60%). Fundamental parameters determined for Pismis 19 from new VVV JHKs photometry are d=2.40±0.15kpc, <EJ–H≥0.34±0.04, and logτ=9.05±0.10, whereas for NGC 4349 the analysis yielded d=1.63±0.13kpc, EJ–H=0.09±0.02, logτ=8.55±0.10. The results exhibit a significant (≥5x) reduction in uncertainties, and indicate that: i) existing parameters for the substellar object NGC 4349 127b require revision, in part because the new cluster parameters imply that the host is 20% less-massive (M*/M∼3.1); ii) R Cru is not a member of NGC 4349 and should be excluded from period-Wesenheit calibrations that anchor the distance scale; iii) and results for Pismis 19 underscore the advantages gleaned from employing deep VVV JHKs data to examine obscured (AV∼4) and differentially reddened intermediate-age clusters.

Abstract Copyright:

Journal keyword(s): techniques: photometric - Hertzsprung-Russell and C-M diagrams - dust, extinction - stars: distances

Simbad objects: 16

goto Full paper

goto View the references in ADS

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 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 802 0
2 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3226 0
3 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2883 0
4 NGC 2451 Cl* 07 45.4 -37 58           ~ 156 1
5 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1418 0
6 IC 2391 OpC 08 41 10 -52 59.5           ~ 778 0
7 NGC 3404 GiG 10 50 17.9811573624 -12 06 31.142976300   14.49       ~ 39 0
8 V* R Cru cC* 12 23 37.6899136176 -61 37 44.852101104 7.41 7.00 6.42     F7Ib/II 149 0
9 NGC 4349 OpC 12 24 12 -61 52.0   8.01 7.4     ~ 100 0
10 NGC 4349 127 * 12 24 35.4709473000 -61 49 11.861413644   12.85 10.82     ~ 43 1
11 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 419 1
12 Cl Pismis 19 OpC 14 30 40 -60 53.3           ~ 32 0
13 V* S Nor cC* 16 18 51.8316855000 -57 53 59.256000852 8.15 7.49 6.49   5.427 F8/G0Ib 360 1
14 NGC 6087 OpC 16 18 53 -57 55.0   5.85 5.4     ~ 167 0
15 M 28 GlC 18 24 32.89 -24 52 11.4           ~ 725 0
16 NAME Galactic Bulge reg ~ ~           ~ 3926 0

To bookmark this query, right click on this link: simbad:objects in 2012A&A...537L...4M and select 'bookmark this link' or equivalent in the popup menu


2022.09.26-01:55:52

© Université de Strasbourg/CNRS

    • Contact