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Infrared observations of GGD objects

Published online by Cambridge University Press:  04 August 2017

R. Carballo
Affiliation:
Instituto de Astrofísica de Canarias, 38071 La Laguna. Tenerife, Spain
C. Eiroa
Affiliation:
Observatorio Astronómico Nacional. Alfonso XII 3. 28014 Madrid, Spain
A. Mampaso
Affiliation:
Instituto de Astrofísica de Canarias, 38071 La Laguna. Tenerife, Spain

Abstract

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We present accurate positions and near infrared photometry (Table I) of 11 point-like objects in the neighbourhood of GGD objects obtained on the 1.55 m and on the 1.23 m in Teide Obs. and Calar Alto Obs. respectively, in Spain. Several of the near infrared sources are directly associated with the GGD nebulae and/or are candidate for their excitation. In addition some of them seem to be the near infrared counterparts of IRAS sources. We believe, on the basis of their infrared excess, far infrared emission (IRAS), association with nebulosity, coincidence with H2O masers or the fact that in most cases the observed luminosities are higher than those expected for main sequence stars, that most of them (9/12) are young stars embedded in the dark clouds which contain the GGD objects. The loci of the detected sources in an (H-K,K-L) infrared two-colour diagram is the same as that obtained for known pre-main sequence stars, such as T Tauris and Herbig Ae-Be stars, indicating the presence of dust shells with temperatures in the range 800–1500 K. The observed range in luminosity, 10–4600 L, added to other different characteristics found between them, such' as the presence, or absence, of H2O masers, indicates the interest for a detailed study of the infrared sources and related GGD nebulae.

Type
Bipolar Flows, Jets and Protostars
Copyright
Copyright © Reidel 1987