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Near-Infrared Imaging of the Star Formation Region AFGL 5142
Near-infrared JHK' and H2 v=1-0 S(1) imaging observations ofthe star-forming region AFGL 5142 are presented. A cluster of youngstars is confirmed to be embedded in the dense molecular cloud core.Many point sources are newly detected. The cluster's K'-magnitudedistribution and [H-K'] color peak have brighter and reddermagnitudes than those outside the cluster. Many of the cluster sourcesexhibit infrared excesses typical of T Tauri stars, Herbig Ae/Be stars,and protostars. The observations also reveal new H2 lineemission around the cluster, exhibiting several jets, filaments, and afaint elliptical structure. The jets are associated with the CO outflowsin the region. The powering sources of the jets, the CO outflows, andthe small faint elliptical structure are identified and analyzedindividually. The strong H2 jets and faint diffuse emissionfurther confirm that the cluster is in an early stage of evolution.
| A study of the Galactic star forming region IRAS 02593+6016/S 201 in infrared and radio wavelengths
We present infrared and radio continuum observations of the S 201 starforming region. A massive star cluster is seen, which contains differentclasses of young stellar objects. The near-infrared colour-colour andcolour-magnitude diagrams are studied to determine the nature of thesesources. We have discovered knots of molecular hydrogen emission at2.122 μm in the central region of S 201. These knots are clearly seenalong the diffuse emission to the north-west and are probably obscuredHerbig-Haro objects. High sensitivity and high resolution radiocontinuum images from GMRT observations at 610 and 1280 MHz show anarc-shaped structure due to the interaction between the HII region andthe adjacent molecular cloud. The ionization front at the interfacebetween the HII region and the molecular cloud is clearly seen comparingthe radio, molecular hydrogen and Brγ images. The emission fromthe carriers of Unidentified Infrared Bands in the mid-infrared 6-9μm (possibly due to PAHs) as extracted from the Midcourse SpaceExperiment survey (at 8, 12, 14 and 21 μm) is compared with the radioemission. The HIRES processed IRAS maps at 12, 25, 60 and 100 μm havealso been used for comparison. The spatial distribution of thetemperature and the optical depth of the warm dust component around theS 201 region has been generated from the mid-infrared images.This paper is based on observations made with the Italian TelescopioNazionale Galileo (TNG) operated on the island of La Palma by the CentroGalileo Galilei of the CNAA (Consorzio Nazionale per l'Astronomia el'Astrofisica) at the Spanish Observatorio del Roque de los Muchachos ofthe Instituto de Astrofisica de Canarias.This publication makes use of data products from the Two Micron All SkySurvey, which is a joint project of the University of Massachusetts andthe Infrared Processing and Analysis Center/California Institute ofTechnology, funded by the National Aeronautics and Space Administrationand the National Science Foundation. IPAC is thanked for providing HIRESprocessed IRAS data.
| Northern JHK Standard Stars for Array Detectors
We report J, H, and K photometry of 86 stars in 40 fields in theNorthern Hemisphere. The fields are smaller than or comparable to a 4' x4' field of view and are roughly uniformly distributed over the sky,making them suitable for a homogeneous broadband calibration network fornear-infrared panoramic detectors. K magnitudes range from 8.5 to 14 andJ-K colors, from -0.2 to 1.2. The photometry is derived from a total of3899 reduced images; each star has been measured, on average, 26.0 timesper filter on 5.5 nights. Typical errors on the photometry are ~0.012mag.
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