NGC 7000, IC 5070, and the Associated Emission-Line Stars.
Abstract
A survey with the slitless grating spectrograph of the region of NGC 7000-IC 5070 resulted in the discovery of 68 stars between = 9 and 19 having the Ha line in emission Most of the brighter emission4ine objects are Be stars, while those of m = 16 and fainter are probably mainly T Tauri stars The T Tauri stars are largely concentrated in the NGC 7000-IC 5070 H TI region and not in the foreground obscuration From the colors of early-type stars in the region, the distance of the foreground dark cloud is estimated to be between 200 parsecs and an uncertain upper limit of 400-800 parsecs An independent estimate gives a lower limit to the distance of the system of T Tauri stars of about 500 parsecs The exciting star of the H ii region has not been identified, undoubtedly because it is very heavily obscured.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1958
- DOI:
- 10.1086/146540
- Bibcode:
- 1958ApJ...128..259H