SIMBAD references

2003MNRAS.341..805P - Mon. Not. R. Astron. Soc., 341, 805-822 (2003/May-3)

The discovery of low-mass pre-main-sequence stars in Cepheus OB3b.

POZZO M., NAYLOR T., JEFFRIES R.D. and DREW J.E.

Abstract (from CDS):

We report the discovery of a low-mass pre-main-sequence (PMS) stellar population in the younger subgroup of the Cepheus OB3 association, Cep OB3b, using UBVI CCD photometry and follow-up spectroscopy. The optical survey covers approximately 1300 arcmin2 on the sky and gives a global photometric and astrometric catalogue for more than 7000 objects. The location of a PMS population is well defined in a V versus (V -I) colour-magnitude diagram.

Multifibre spectroscopic results for optically selected PMS candidates confirm the T Tauri nature for 10 objects, with equal numbers of classical TTS (CTTS) and weak-line TTS (WTTS). There are six other objects that we classify as possible PMS stars. The newly discovered TTS stars have masses in the range ∼0.9-3.0 Mand ages from <1 to nearly 10 Myr, based on the Siess, Dufour & Forestini isochrones. Their location close to the O and B stars of the association (especially the O7n star) demonstrates that low-mass star formation is indeed possible in such an apparently hostile environment dominated by early-type stars and that the latter must have been less effective in eroding the circumstellar discs of their lower-mass siblings compared with other OB associations (e.g. λ-Ori). We attribute this to the nature of the local environment, speculating that the bulk of molecular material, which shielded low-mass stars from the ionizing radiation of their early-type siblings, has only recently been removed.


Abstract Copyright: 2003 RAS

Journal keyword(s): accretion, accretion discs - techniques: radial velocities - stars: formation - stars: late-type - stars: pre-main-sequence - open clusters and associations: individual: Cepheus OB3

VizieR on-line data: <Available at CDS (J/MNRAS/341/805): catalog.dat flags.dat>

Nomenclature: Table 4: [PNJ2003] NNN N=22 among (Nos 7-106).

Simbad objects: 50

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2020.11.30-07:56:42

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