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One of the very first steps astronomers working in stellar physics perform toadvance in their studies, is to determine the most common/relevant physicalparameters of the objects of study (effective temperature, bolometricluminosity, surface gravity, etc.). Different methodologies exist depending onthe nature of the data, intrinsic properties of the objects, etc. One commonapproach is to compare the observational data with theoretical models passedthrough some simulator that will leave in the synthetic data the same imprintthan the observational data carries, and see what set of parameters reproducethe observations best. Even in this case, depending on the kind of data theastronomer has, the methodology changes slightly. After parameters arepublished, the community tend to quote, praise and criticize them, sometimespaying little attention on whether the possible discrepancies come from thetheoretical models, the data themselves or just the methodology used in theanalysis. In this work we perform the simple, yet interesting, exercise ofcomparing the effective temperatures obtained via SED and more detailedspectral fittings (to the same grid of models), of a sample of well known andcharacterized young M-type objects members to different star forming regionsand show how differences in temperature of up to 350 K can be expected justfrom the difference in methodology/data used. On the other hand we show howthese differences are smaller for colder objects even when the complexity ofthe fit increases like for example introducing differential extinction. Toperform this exercise we benefit greatly from the framework offered by theVirtual Observatory.

Physical parameter determinations of young Ms. Taking advantage of the Virtual Observatory to compare methodologies