Some Results of an H Survey in the Taurus Dark Clouds

Observations

The observations were carried out on the 1m (40-inch) Schmidt telescope of the Byurakan Astrophysical Observatory with a 4 deg. objective prism. We used a Schott RG1 filter with Kodak 103a-E, IIa-E and 103-F type plates. The observational details are presented in Table 1. Plate 1 was obtained by E.Parsamian.

Table 1: H observations in the region of TDC. Note: a designations as in Fig.1; b obtained by E.Parsamian.)

Number of	Type of	Exposing	Date of the	Alphabetical symbol
the plates	the plates	times	observations	of the area embraced
1	Kodak IIa-E	90 min	25.10.1970	B
2	Kodak 103a-E	43	29.12.1983	A
3	Kodak 103a-E	60	30.12.1983	A
4	Kodak 103a-E	2x10	31.12.1983	A
5	Kodak 103a-E	60	31.12.1983	C
6	Kodak 103a-E	75	31.12.1983	C
7	Kodak 103a-E	90	31.12.1983	A
8	Kodak 103a-E	2x7	01.01.1984	C
9	Kodak 103a-E	3x10	01.01.1984	B
10	Kodak 103a-E	5;8	01.01.1984	A
11	Kodak 103a-E	60	01.01.1984	A
12	Kodak 103a-F	60	02.01.1984	B

The total survey region patrol time was about 10 hours. Since the observations covered a few superposed fields along the extent of the dark clouds (see Fig.1), the overall survey area was approximately 50 sq.deg. with the common centre at R.A.(1950.0)=0430 and Decl.(1950.0)=+24deg. (the region of the Taurus1- Taurus3 T-associations). Different exposure times were selected to clearly reveal H emission in stars of different brightness. The survey's limiting magnitude was . The evaluation of the relative H emission intensity was made using the conventional five-grade scale proposed by Haro(1953).

© Copyright Astronomical Society of Australia 1997