Hα emission-line stars in molecular clouds : II. The M42 region
| Autor: | Tina Armond, Bertil Pettersson, Bo Reipurth |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Physics
Infrared excess education.field_of_study Molecular cloud Population FOS: Physical sciences Astronomy and Astrophysics Astrophysics emission-line [stars] Stars Photometry (astronomy) Astrophysics - Solar and Stellar Astrophysics Astronomi astrofysik och kosmologi Space and Planetary Science formation / stars: pre-main sequence [Be / stars] Orion Nebula Cluster (physics) Astronomy Astrophysics and Cosmology Emission spectrum education Solar and Stellar Astrophysics (astro-ph.SR) |
| Popis: | We present a deep survey of Halpha emission-line stars in the M42 region using wide-field objective prism films. A total of 1699 Halpha emission-line stars were identified, of which 1025 were previously unknown, within an area of 5.5 x 5.5 degrees centred on the Trapezium Cluster. We present Halpha strength estimates, positions, and JHKs photometry extracted from 2MASS, and comparisons to previous surveys. The spatial distribution of the bulk of the stars follows the molecular cloud as seen in CO and these stars are likely to belong to the very young population of stars associated with the Orion Nebula Cluster. Additionally, there is a scattered population of Halpha emission-line stars distributed all over the region surveyed, which may consist partly of foreground stars associated with the young NGC 1980 cluster, as well as some foreground and background dMe or Be stars. The present catalogue adds a large number of candidate low-mass young stars belonging to the Orion population, selected independently of their infrared excess or X-ray emission. Comment: 38 pages, 18 figures. Published in Astronomy & Astrophysics v3: chart for ESO-HA 1639 corrected. Typos in Table 2 corrected. Photometry for ESO-HA 1639 in Table 2 corrected |
| Databáze: | OpenAIRE |
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