PRE-MAIN-SEQUENCE STARS IN THE CEPHEUS FLARE REGION

Journal Article · Tue Dec 01 04:00:00 EST 2009 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/185/2/451; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21301470

Kun, Maria ^[1]; Balog, Zoltan ^[2]; Kenyon, Scott J ^[3]; Mamajek, Eric E ^[4]

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1. Konkoly Observatory, H-1121 Budapest, Konkoly Thege ut 15-17 (Hungary)
2. Steward Observatory, 933 N. Cherry Ave., Tucson, AZ 85721-0065 (United States)
3. Harvard-Smithsonian CfA, 60 Garden St. Cambridge, MA 02138 (United States)
4. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171 (United States)

We present results of optical spectroscopic and BVR {sub C} I {sub C} photometric observations of 77 pre-main-sequence (PMS) stars in the Cepheus flare region. A total of 64 of these are newly confirmed PMS stars, originally selected from various published candidate lists. We estimate effective temperatures and luminosities for the PMS stars, and comparing the results with PMS evolutionary models, we estimate stellar masses of 0.2-2.4 M {sub sun} and stellar ages of 0.1-15 Myr. Among the PMS stars, we identify 15 visual binaries with separations of 2-10 arcsec. From archival IRAS, Two Micron All Sky Survey, and Spitzer data, we construct their spectral energy distributions (SEDs) and classify 5% of the stars as Class I, 10% as Flat SED, 60% as Class II, and 3% as Class III young stellar objects. We identify 12 classical T Tauri stars and two weak-line T Tauri stars as members of NGC 7023, with a mean age of 1.6 Myr. The 13 PMS stars associated with L1228 belong to three small aggregates: RNO 129, L1228A, and L1228S. The age distribution of the 17 PMS stars associated with L1251 suggests that star formation has propagated with the expansion of the Cepheus flare shell. We detect sparse aggregates of {approx}6-7 Myr old PMS stars around the dark clouds L1177 and L1219, at a distance of {approx}400 pc. Three T Tauri stars appear to be associated with the Herbig Ae star SV Cep at a distance of 600 pc. Our results confirm that the molecular complex in the Cepheus flare region contains clouds of various distances and star-forming histories.

• OSTI ID: 21301470
• Journal Information: Astrophysical Journal, Supplement Series, Journal Name: Astrophysical Journal, Supplement Series Journal Issue: 2 Vol. 185; ISSN 0067-0049; ISSN APJSA2
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
99 GENERAL AND MISCELLANEOUS
ENERGY SPECTRA
LUMINOSITY
MAIN SEQUENCE STARS
MASS
T TAURI STARS