Survey observations of emission-line stars in the Orion region. 4: The KISO areas A-1047 and A-1048

Details Survey observations of emission-line stars in the Orion region. 4: The KISO areas A-1047 and A-1048 Survey observations of emission-line stars in the Orion region. 4: The KISO areas A-1047 and A-1048

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..643w&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 4, p. 643-653

Astronomy and Astrophysics

Astronomy

26

Emission Spectra, H Alpha Line, Orion Constellation, Sky Surveys (Astronomy), Stellar Spectra, Astronomical Coordinates, Brightness Distribution, Schmidt Telescopes, Stellar Magnitude, T Tauri Stars

Scientific paper

We carried out survey observations for H-alpha emission stars in Kiso areas A-1047 (5 deg by 5 deg, centered at alpha = 5 hours 20 min., delta = -10 deg) and A-1048 (5 deg by 5 deg, centered at alpha = 5 hours 40 min., delta = -10 deg) in a series of our extensive surveys in the Orion region. The observations were made using mainly the Kiso Schmidt telescope, and partly using the Cerro Tololo Inter-American Observatory (CTIO) Curtis Schmidt telescope. The numbers of detected H-alpha emission stars were 36 and 79 for areas A-1047 and A-1048, respectively. Out of them, 33 in A-1047 and 50 in A-1048 are new findings. The celestial coordinates and V magnitudes of the detected stars were measured, along with an eye estimation of the H-alpha emission strengths. The brightness distribution, which is peaked at V = 15 for A-1047 and V = 16 for A-1048, suggests that the detected H-alpha-emission stars are probable candidates of T Tauri-type stars. They are distributed rather uniformly in area A-1047, while in area A-1048 they are markedly concentrated along the dark cloud Lynds 1641 in the central northern part. It has been found the fractional number of H-alpha-emission stars with a strong emission line is high in area A-1048, while it is very low in area A-1047.

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