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PMS-objects in the star formation region Cep OB3. I. Stars with Hα emission

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Results are presented from a detailed analysis of PMS stars located in the star-formation region that includes the bright part of the ionization front of the molecular cloud Cep B. Slitless spectroscopy is used to detect 149 stars with Ha emission. Models for the distribution of the spectral energy are constructed for 203 PMS stars based on photometric data in the visible and infrared and their basic parameters are determined. A good correlation is observed between the Hα emission intensity and the infrared excess. The relative disk mass and degree of accretion for stars with EW(Hα) > 10Å and α > −1.8 are about an order of magnitude greater than for the other stellar objects. The average distance and age of the PMS stars in the cluster are 890 pc and 0.74 million years, respectively. The stars with EW(Hα) > 10Å and α > −1.8 are more than 0.5 million years “younger” than the others.

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Authors and Affiliations

  1. V. A. Ambartsumyan Byurakan Astrophysical Observatory, Byurakan, Armenia

    E. H. Nikoghosyan

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  1. E. H. Nikoghosyan
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Correspondence to E. H. Nikoghosyan.

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Translated from Astrofizika, Vol. 56, No. 1, pp. 33–49 (February 2013).

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Nikoghosyan, E.H. PMS-objects in the star formation region Cep OB3. I. Stars with Hα emission. Astrophysics 56, 26–41 (2013). https://doi.org/10.1007/s10511-013-9265-x

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  • DOI: https://doi.org/10.1007/s10511-013-9265-x

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