An infrared study of galactic OH/IR stars II. the GLMP sample of red oxygen-rich AGB stars

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作者：
Jiménez-Esteban, F.M. [1 ,3 ]
García-Lario, P. [2 ]
Engels, D. [3 ]
Perea Calderón, J.V. [1 ]
机构：
[1] ISO Data Centre, Villafranca del Castillo, Apartado de Correos 50727, 28080 Madrid, Spain
[2] ISO Data Centre, Research and Scientific Support Department of ESA, Villafranca del Castillo, Apartado de Correos 50727, 28080 Madrid, Spain
[3] Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
来源：
Astronomy and Astrophysics | 1600年 / 446卷 / 02期
关键词：
We present optical and near-infrared finding charts taken from the DSS and 2MASS surveys of 94 IRAS sources selected from the GLMP catalogue; and accurate astrometry (0.2″) for most of them. Selection criteria were very red IRAS colours representative for OH/IR stars with optically thick circumstellar shells and the presence of variability according to the IRAS variability index (VAR > 50). The main photometric properties of the stars in this GLMP sample are presented; discussed and compared with the correspondent properties of the Arecibo sample of OH/IR stars studied nearlier. We find that 37% of the sample (N = 34) has no counterpart in the 2MASS; implying extremely high optical depths of their shells. Most of the sources identified in the 2MASS are faint (K 8) and are of very red colour in the near-infrared; as expected. The brightest 2MASS counterpart (K = 5.3 mag) was found for IRAS 18299-1705. Its blue colour H-K = 1.3 suggests that IRAS 18299-1705 is a post-AGB star. Few GLMP sources have faint but relatively blue counterparts. They might be misidentifed field stars or stars that recently experienced a drop of their mass loss rates. The GLMP sample in general is made of oxygen-rich AGB stars; which are highly obscured by their circumstellar shells. They belong to the same population as the reddest OH/IR stars in the Arecibo sample. © ESO 2006;
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页码：773 / 783
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