Astron. J., 149, 200 (2015/June-0)
An optical survey of the partially embedded young cluster in NGC 7129.
DAHM S.E. and HILLENBRAND L.A.
Abstract (from CDS):
NGC 7129 is a bright reflection nebula located in the molecular cloud complex near l = 105.°4, b = +9.°9, about 1.15 kpc distant. Embedded within the reflection nebula is a young cluster dominated by a compact grouping of four early-type stars: BD+65°1638 (B3V), BD+65°1637 (B3e), SVS 13 (B5e), and LkHα 234 (B8e). About 80 Hα emission sources brighter than V ∼ 23 are identified in the region, many of which are presumably T Tauri star members of the cluster. We also present deep (V ∼23), optical (VRCIC) photometry of a field centered on the reflection nebula and spectral types for more than 130 sources determined from low dispersion, optical spectroscopy. The narrow pre-main sequence evident in the color-magnitude diagram suggests that star formation was rapid and coeval. A median age of about 1.8 Myr is inferred for the Hα and literature-identified X-ray emission sources having established spectral types, using pre-main sequence evolutionary models. Our interpretation of the structure of the molecular cloud and the distribution of young stellar objects is that BD+65°1638 is primarily responsible for evacuating the blister-like cavity within the molecular cloud. LkHα 234 and several embedded sources evident in near-infrared adaptive optics imaging have formed recently within the ridge of compressed molecular gas. The compact cluster of low-mass stars formed concurrently with the early-type members, concentrated within a central radius of ∼0.7 pc. Star formation is simultaneously occurring in a semi-circular arc some ∼3 pc in radius that outlines remaining dense regions of molecular gas. High dispersion, optical spectra are presented for BD+65°1638, BD+65°1637, SVS 13, LkHα 234, and V350 Cep. These spectra are discussed in the context of the circumstellar environments inferred for these stars.
open clusters and associations: individual: NGC 7129 - stars: formation - stars: pre-main sequence
VizieR on-line data:
<Available at CDS (J/AJ/149/200): table1.dat table2.dat table3.dat table4.dat>
Table 1: IfAHA NNN (Nos 763-821) added. Table 3: [DH2015] NN (Nos 1-72). Table 4: [DH2015] JHHMMSS.ss+DDMMSS.s N=2435.
Status at CDS:
All or part of tables of objects could be ingested in SIMBAD with priority 2.
S3-U1350 is a probable misprint for S2-U1350.
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