Query : 2008A&A...488..211C

2008A&A...488..211C - Astronomy and Astrophysics, volume 488, 211-218 (2008/9-2)

Circumstellar disks in the outer Galaxy: the star-forming region NGC1893.


Abstract (from CDS):

It is still debated whether star formation process depends on environment. In particular it is yet unclear whether star formation in the outer Galaxy, where the environmental conditions are, theoretically, less conducive, occurs in the same way as in the inner Galaxy. We investigate the population of NGC1893, a young cluster (∼3-4Myr) in the outer part of the Galaxy (RG≥11kpc), to explore the effects of environmental conditions on star forming regions. We present infrared observations acquired using the IRAC camera onboard the Spitzer Space Telescope and analyze the color-color diagrams to establish the membership of stars with excesses. We also merge this information with that obtained from Chandra ACIS-I observations, to identify the Class III population. We find that the cluster is very rich, with 242 PMS Classical T Tauri stars and 7 Class 0/I stars. We identify 110 Class III candidate cluster members in the ACIS-I field of view. We estimate a disk fraction for NGC1893 of about 67%, similar to fractions calculated for nearby star forming regions of the same age. Although environmental conditions are unfavorable, star formation can clearly be very successful in the outer Galaxy, allowing creation of a very rich cluster like NGC1893.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: circumstellar matter - Galaxy: open cluster and association: individual: NGC1893 - stars: formation

VizieR on-line data: <Available at CDS (J/A+A/488/211): table1.dat table4.dat>

Nomenclature: Table 1: Cl* NGC 1893 CMP NNNNN (Nos 1-15277).

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

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1368 1
2 IC 410 Cl* 05 22.0 +33 29           ~ 55 0
3 NGC 1893 OpC 05 22 53.8 +33 26 38           ~ 258 0
4 Ass Aur OB 2 As* 05 28 +34.9           ~ 45 0
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13889 0

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