A galex-based search for the sparse young stellar population in the taurus-aurigae star forming region



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Gómez de Castro, Ana I. and López Santiago, Javier and López Martínez, Fátima and Sánchez, Néstor and Sestito, Paola and Castro Rubio, Elisa de and Cornide Castro-Piñeiro, Manuel and Yañez Gestoso, Javier (2015) A galex-based search for the sparse young stellar population in the taurus-aurigae star forming region. Astrophysical journal supplement series, 216 (2). ISSN 0067-0049

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Official URL: http://dx.doi.org/10.1088/0067-0049/216/2/26


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.

Item Type:Article
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© 2015. The American Astronomical Society. All rights reserved. This research was partially supported by grant AYA2011-29754-C03-01 from the Government of Spain.

Uncontrolled Keywords:Low-mass stars; Ophiuchi dark cloud; Main-sequence stars; All-sky survey; Brown dwarfs; Orion nebula; Open cluster; Gould belt; TW-hydrae; Ultraviolet
Subjects:Sciences > Physics > Astrophysics
ID Code:30064
Deposited On:21 May 2015 09:12
Last Modified:10 Dec 2018 15:05

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