A far-infrared H-R diagram of young stellar objects.

Details A far-infrared H-R diagram of young stellar objects. A far-infrared H-R diagram of young stellar objects.

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mmkyo..39..197d&link_type=abstract

Memoirs of the Faculty of Sciences University of Kyoto Ser. Phys., Astrophys., Geophys., Chem., Vol. 39, No. 2, p. 197 - 237

Astronomy and Astrophysics

Astrophysics

1

Young Stars: Hr Diagrams, Young Stars: Infrared Luminosities, Young Stars: Star-Forming Regions

Scientific paper

The observed spectral energy distributions of high- and low-mass young stellar objects (YSOs) are almost a modified blackbody-like one at far-infrared (FIR) to mm wavelengths. These emissions are produced at the outer envelopes of YSOs and the spectra are represented by the FIR color. For the nearby star-forming regions in Per OB2, Taurus, Orion, Vela, and ρ Oph molecular clouds, the authors selected cold IRAS point sources corresponding to YSOs and constructed FIR H-R diagrams of YSOs, i.e. the luminosity of 60 μm versus the color log flux densities at 60 and 100 μm relation. The authors also examined the visual counterparts of these YSOs on the POSS prints. The FIR H-R diagrams for the individual star-forming regions show common properties in the luminosity-color relation and the locations of the extreme Class I YSOs and the active YSOs. The fundamental line on the FIR H-R diagram is a constant envelope mass sequence along which YSOs move following the evolutionary change in the luminosity of the central object. From analysis of the FIR H-R diagrams, the authors suggest that the extreme Class I YSOs have already stored material of stellar mass in the central part and are forming stars through a slow accretion of the material.

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