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Title: Non-emission-line young stars of intermediate mass
Authors: Manoj, P
Maheswar, G
Bhatt, H. C
Keywords: Optical Spectra;Stellar Objects;Herbig Ae/Be Stars;Orion Nebula Cluster;Infrared Luminosities;Dust Masses;IRAS Fluxes;Be Stars
Issue Date: Aug-2002
Publisher: Blackwell Publishing Ltd
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 334, No. 2, pp. 419 – 425
Abstract: We present optical spectra of four intermediate-mass candidate young stellar objects that have often been classified as Herbig Ae/Be stars. Typical Herbig Ae/Be emission features are not present in the spectra of these stars. Three of them, HD 36917, HD 36982 and HD 37062, are members of the young Orion nebula cluster (ONC). This association constrains their ages to be ≲1 Myr. The lack of appreciable near-infrared excess in them suggests the absence of hot dust close to the central star. However, they do possess significant amounts of cold and extended dust as revealed by the large excess emission observed at far-infrared wavelengths. The fractional infrared luminosities (Lir/L★) and the dust masses computed from IRAS fluxes are systematically lower than those found for Herbig Ae/Be stars but higher than those for Vega-like stars. These stars may thus represent the youngest examples of the Vega phenomenon known so far. In contrast, the other star in our sample, HD 58647, is more likely to be a classical Be star, as is evident from the low Lir/L★ , the scarcity of circumstellar dust, the low polarization, the presence of Hα emission and near-infrared excess, and the far-infrared spectral energy distribution consistent with free–free emission similar to other well-known classical Be stars.
ISSN: 0035-8711
Appears in Collections:IIAP Publications

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