2015A&A...578A...4S


Query : 2015A&A...578A...4S

2015A&A...578A...4S - Astronomy and Astrophysics, volume 578A, 4-4 (2015/6-1)

Circumstellar discs in Galactic centre clusters: Disc-bearing B-type stars in the Quintuplet and Arches clusters.

STOLTE A., HUSSMANN B., OLCZAK C., BRANDNER W., HABIBI M., GHEZ A.M., MORRIS M.R., LU J.R., CLARKSON W.I. and ANDERSON J.

Abstract (from CDS):

We investigate the circumstellar disc fraction as determined from L-band excess observations of the young, massive Arches and Quintuplet clusters residing in the central molecular zone of the Milky Way. The Quintuplet cluster was searched for L-band excess sources for the first time. We find a total of 26 excess sources in the Quintuplet cluster, and 21 sources with L-band excesses in the Arches cluster, of which 13 are new detections. With the aid of proper motion membership samples, the disc fraction of the Quintuplet cluster could be derived for the first time to be 4.0±0.7%. There is no evidence for a radially varying disc fraction in this cluster. In the case of the Arches cluster, a disc fraction of 9.2±1.2% approximately out to the cluster's predicted tidal radius, r<1.5pc, is observed. This excess fraction is consistent with our previously found disc fraction in the cluster in the radial range 0.3<r<0.8pc. In both clusters, the host star mass range covers late A- to early B-type stars, 2<M<15M, as derived from J-band photospheric magnitudes. We discuss the unexpected finding of dusty circumstellar discs in these UV intense environments in the context of primordial disc survival and formation scenarios of secondary discs. We consider the possibility that the L-band excess sources in the Arches and Quintuplet clusters could be the high-mass counterparts to T Tauri pre-transitional discs. As such a scenario requires a long pre-transitional disc lifetime in a UV intense environment, we suggest that mass transfer discs in binary systems are a likely formation mechanism for the B-star discs observed in these starburst clusters.

Abstract Copyright:

Journal keyword(s): techniques: high angular resolution - open clusters and associations: individual: Quintuplet - circumstellar matter - open clusters and associations: individual: Arches - astrometry - proper motions

VizieR on-line data: <Available at CDS (J/A+A/578/A4): tablee1.dat tablee2.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 IC 348 OpC 03 44 32 +32 09.5           ~ 1337 1
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4102 0
3 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1568 1
4 NAME Garrison 1 OpC 05 38 42 -02 36.0           ~ 539 0
5 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1910 1
6 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1124 1
7 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1731 0
8 NGC 2362 OpC 07 18 41 -24 57.2           ~ 396 0
9 HD 94878 EB* 10 55 58.9149262296 -60 23 33.436864428 8.67 9.37 8.70 8.07   B0/2eq 150 0
10 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1095 1
11 NGC 3576 HII 11 11 49.8 -61 18 14           ~ 234 2
12 RCW 57 HII 11 14.7 -61 12           ~ 15 0
13 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1032 1
14 HD 327083 s*b 17 15 15.3711774600 -40 20 06.792259560 12.07 11.44 10.00 9.64   B6Ieq 56 0
15 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13458 0
16 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 701 0
17 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 503 0
18 HD 165014 * 18 04 43.1589025728 -20 56 44.812766472   9.948 9.25     F2V 16 0
19 HD 166191 * 18 10 30.3388577208 -23 34 00.266472840   8.86 8.38     F3/5V 28 0
20 HD 167905 * 18 18 18.2386707072 -23 28 19.735152852   9.700 9.026     F3V 13 0
21 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1575 0
22 HD 176137 ** 18 58 45.3343 +02 07 08.815   9.27 8.78     F6V 10 0

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2023.02.08-21:58:41

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