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Stringent upper limits to the solid NH3 abundance towards W 33A from near-IR spectroscopy with the Very Large Telescope
We obtained near-infrared spectroscopy of the high mass young stellarobject W 33A between 1.9-2.5 mu m in search of absorption features ofcircumstellar ices. The 2.27 mu m band of CH3OH is positivelyidentified in the spectrum, its intensity being fully consistent withthe column density derived earlier from the methanol bands at 3.54 and3.91 mu m. The 2.21 mu m band of solid NH3, on the otherhand, was not detected. This shows that the quantity of solidNH3 towards W 33A is at least 3 times lower than earlierestimates based on the NH3 umbrella mode at 9 mu m.Based on observations obtained at the European Southern Observatory(ESO), Paranal, Chile.
| Optical identifications of IRAS point sources - The Fornax, Hydra I and Coma clusters
Optical identifications are presented for 66 IRAS point sources in theregion of the Fornax cluster of galaxies, 106 IRAS point sources in theregion of the Hydra I cluster of galaxies (Abell 1060), and 59 IRASpoint sources in the region of the Coma cluster of galaxies (Abell1656). Eight other sources in Hydra I do not have optical counterpartsand are very probably due to IR cirrus. Twenty-three (35 percent) of theFornax sources are associated with stars and 43 (65 percent) withgalaxies; 48 (42 percent) of the Hydra I sources are associated withstars and 58 (51 percent) with galaxies; 18 (31 percent) of the Comasources are associated with stars and 41 (69 percent) with galaxies. Thestellar and infrared cirrus surface density is consistent with thegalactic latitude of each field.
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Наблюдательные данные и астрометрия
| Созвездие: | Гидра |
| Прямое восхождение: | 10h35m01.98s |
| Склонение: | -26°22'54.3" |
| Видимая звёздная величина: | 7.608 |
| Расстояние: | 235.294 парсек |
| Собственное движение RA: | -40.7 |
| Собственное движение Dec: | -1.9 |
| B-T magnitude: | 9.089 |
| V-T magnitude: | 7.731 |
Каталоги и обозначения:
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