Pre-main sequence stars in the Cepheus flare region - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate

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Abstract: We present results of optical spectroscopic and BVR CI C photometricobservations of 77 pre-main sequence PMS stars in the Cepheus flare region. Atotal of 64 of these are newly confirmed PMS stars, originally selected fromvarious published candidate lists. We estimate effective temperatures andluminosities for the PMS stars, and comparing the results with pre-mainsequence evolutionary models we estimate stellar masses of 0.2-2.4M sun andstellar ages of 0.1-15 Myr. Among the PMS stars, we identify 15 visual binarieswith separations of 2-10 arcsec. From archival IRAS, 2MASS, and Spitzer data,we construct their spectral energy distributions and classify 5% of the starsas Class I, 10% as Flat SED, 60% as Class II, and 3% as Class III young stellarobjects YSOs. We identify 12 CTTS and 2 WTTS as members of NGC 7023, withmean age of 1.6 Myr. The 13 PMS stars associated with L1228 belong to threesmall aggregates: RNO 129, L1228A, and L1228S. The age distribution of the 17PMS stars associated with L1251 suggests that star formation has propagatedwith the expansion of the Cepheus flare shell. We detect sparse aggregates of6-7 Myr old PMS stars around the dark clouds L1177 and L1219, at a distance of400 pc. Three T Tauri stars appear to be associated with the Herbig Ae star SVCep at a distance of 600 pc. Our results confirm that the molecular complex inthe Cepheus flare region contains clouds of various distances and star forminghistories.

Author: M. Kun, Z. Balog, S. J. Kenyon, E. E. Mamajek, R. A. Gutermuth



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