Abstract
In this work, we identify 63 bona fide new candidates to T Tauri stars
(TTSs) in the Taurus-Auriga region, using its ultraviolet excess
as our baseline. The initial data set was defined from the GALEX
all sky survey (AIS). The GALEX satellite obtained images in the
near-ultraviolet (NUV) and far-ultraviolet (FUV) bands where
TTSs show a prominent excess compared with main-sequence or
giants stars. GALEX AIS surveyed the Taurus-Auriga molecular
complex, as well as a fraction of the California Nebula and the
Perseus complex; bright sources and dark clouds were avoided.
The properties of TTSs in the ultraviolet (GALEX), optical
(UCAC4), and infrared (2MASS) have been defined using the TTSs
observed with the International Ultraviolet Explorer reference
sample. The candidates were identified by means of a mixed
ultraviolet-optical-infrared excess set of colors; we found that
the FUV-NUV versus J-K color-color diagram is ideally suited for
this purpose. From an initial sample of 163,313 bona fide NUV
sources, a final list of 63 new candidates to TTSs in the region
was produced. The search procedure has been validated by its
ability to detect all known TTSs in the area surveyed: 31 TTSs.
Also, we show that the weak-lined TTSs are located in a well-
defined stripe in the FUV-NUV versus J-K diagram. Moreover, in
this work, we provide a list of TTSs photometric standards for
future GALEX-based studies of the young stellar population in
star forming regions.
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